diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 4bb64ee..9f934c6 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -1,12 +1,12 @@
 /*
  * Copyright (C) 2008 The Android Open Source Project
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
- * 
+ *
  * http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
@@ -17,13 +17,9 @@
 package com.android.inputmethod.latin;
 
 import android.content.Context;
+import android.content.res.AssetFileDescriptor;
 import android.util.Log;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.channels.Channels;
 import java.util.Arrays;
 
 /**
@@ -48,15 +44,12 @@
 
     private int mDicTypeId;
     private int mNativeDict;
-    private int mDictLength;
+    private long mDictLength;
     private final int[] mInputCodes = new int[MAX_WORD_LENGTH * MAX_ALTERNATIVES];
     private final char[] mOutputChars = new char[MAX_WORD_LENGTH * MAX_WORDS];
     private final char[] mOutputChars_bigrams = new char[MAX_WORD_LENGTH * MAX_BIGRAMS];
     private final int[] mFrequencies = new int[MAX_WORDS];
     private final int[] mFrequencies_bigrams = new int[MAX_BIGRAMS];
-    // Keep a reference to the native dict direct buffer in Java to avoid
-    // unexpected deallocation of the direct buffer.
-    private ByteBuffer mNativeDictDirectBuffer;
 
     static {
         try {
@@ -78,30 +71,9 @@
         mDicTypeId = dicTypeId;
     }
 
-    /**
-     * Create a dictionary from a byte buffer. This is used for testing.
-     * @param context application context for reading resources
-     * @param byteBuffer a ByteBuffer containing the binary dictionary
-     */
-    public BinaryDictionary(Context context, ByteBuffer byteBuffer, int dicTypeId) {
-        if (byteBuffer != null) {
-            if (byteBuffer.isDirect()) {
-                mNativeDictDirectBuffer = byteBuffer;
-            } else {
-                mNativeDictDirectBuffer = ByteBuffer.allocateDirect(byteBuffer.capacity());
-                byteBuffer.rewind();
-                mNativeDictDirectBuffer.put(byteBuffer);
-            }
-            mDictLength = byteBuffer.capacity();
-            mNativeDict = openNative(mNativeDictDirectBuffer,
-                    TYPED_LETTER_MULTIPLIER, FULL_WORD_FREQ_MULTIPLIER,
-                    MAX_WORD_LENGTH, MAX_WORDS, MAX_ALTERNATIVES);
-        }
-        mDicTypeId = dicTypeId;
-    }
-
-    private native int openNative(ByteBuffer bb, int typedLetterMultiplier,
-            int fullWordMultiplier, int maxWordLength, int maxWords, int maxAlternatives);
+    private native int openNative(String apkFileName, long dictOffset, long dictSize,
+            int typedLetterMultiplier, int fullWordMultiplier, int maxWordLength,
+            int maxWords, int maxAlternatives);
     private native void closeNative(int dict);
     private native boolean isValidWordNative(int nativeData, char[] word, int wordLength);
     private native int getSuggestionsNative(int dict, int[] inputCodes, int codesSize,
@@ -112,37 +84,17 @@
             int maxWordLength, int maxBigrams, int maxAlternatives);
 
     private final void loadDictionary(Context context, int resId) {
-        InputStream is = null;
-        try {
-            is = context.getResources().openRawResource(resId);
-            final int total = is.available();
-            mNativeDictDirectBuffer =
-                ByteBuffer.allocateDirect(total).order(ByteOrder.nativeOrder());
-            final int got = Channels.newChannel(is).read(mNativeDictDirectBuffer);
-            if (got != total) {
-                Log.e(TAG, "Read " + got + " bytes, expected " + total);
-            } else {
-                mNativeDict = openNative(mNativeDictDirectBuffer,
-                        TYPED_LETTER_MULTIPLIER, FULL_WORD_FREQ_MULTIPLIER,
-                        MAX_WORD_LENGTH, MAX_WORDS, MAX_ALTERNATIVES);
-                mDictLength = total;
-            }
-        } catch (IOException e) {
-            Log.w(TAG, "No available memory for binary dictionary");
-        } finally {
-            try {
-                if (is != null) is.close();
-            } catch (IOException e) {
-                Log.w(TAG, "Failed to close input stream");
-            }
-        }
+        final AssetFileDescriptor afd = context.getResources().openRawResourceFd(resId);
+        mNativeDict = openNative(context.getApplicationInfo().sourceDir,
+                afd.getStartOffset(), afd.getLength(),
+                TYPED_LETTER_MULTIPLIER, FULL_WORD_FREQ_MULTIPLIER,
+                MAX_WORD_LENGTH, MAX_WORDS, MAX_ALTERNATIVES);
+        mDictLength = afd.getLength();
     }
 
-
     @Override
     public void getBigrams(final WordComposer codes, final CharSequence previousWord,
             final WordCallback callback, int[] nextLettersFrequencies) {
-
         char[] chars = previousWord.toString().toCharArray();
         Arrays.fill(mOutputChars_bigrams, (char) 0);
         Arrays.fill(mFrequencies_bigrams, 0);
@@ -212,7 +164,7 @@
         return isValidWordNative(mNativeDict, chars, chars.length);
     }
 
-    public int getSize() {
+    public long getSize() {
         return mDictLength; // This value is initialized on the call to openNative()
     }
 
@@ -221,6 +173,7 @@
         if (mNativeDict != 0) {
             closeNative(mNativeDict);
             mNativeDict = 0;
+            mDictLength = 0;
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index be98f4c..ad783ca 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -371,23 +371,19 @@
         int mainDicResId = getMainDictionaryResourceId(res);
         mSuggest = new Suggest(this, mainDicResId);
         loadAndSetAutoCorrectionThreshold(prefs);
-        if (mUserDictionary != null) mUserDictionary.close();
+
         mUserDictionary = new UserDictionary(this, locale);
-        if (mContactsDictionary == null) {
-            mContactsDictionary = new ContactsDictionary(this, Suggest.DIC_CONTACTS);
-        }
-        if (mAutoDictionary != null) {
-            mAutoDictionary.close();
-        }
+        mSuggest.setUserDictionary(mUserDictionary);
+
+        mContactsDictionary = new ContactsDictionary(this, Suggest.DIC_CONTACTS);
+        mSuggest.setContactsDictionary(mContactsDictionary);
+
         mAutoDictionary = new AutoDictionary(this, this, locale, Suggest.DIC_AUTO);
-        if (mUserBigramDictionary != null) {
-            mUserBigramDictionary.close();
-        }
+        mSuggest.setAutoDictionary(mAutoDictionary);
+
         mUserBigramDictionary = new UserBigramDictionary(this, this, locale, Suggest.DIC_USER);
         mSuggest.setUserBigramDictionary(mUserBigramDictionary);
-        mSuggest.setUserDictionary(mUserDictionary);
-        mSuggest.setContactsDictionary(mContactsDictionary);
-        mSuggest.setAutoDictionary(mAutoDictionary);
+
         updateCorrectionMode();
         mWordSeparators = res.getString(R.string.word_separators);
         mSentenceSeparators = res.getString(R.string.sentence_separators);
@@ -397,11 +393,9 @@
 
     @Override
     public void onDestroy() {
-        if (mUserDictionary != null) {
-            mUserDictionary.close();
-        }
-        if (mContactsDictionary != null) {
-            mContactsDictionary.close();
+        if (mSuggest != null) {
+            mSuggest.close();
+            mSuggest = null;
         }
         unregisterReceiver(mReceiver);
         mVoiceConnector.destroy();
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index 9f979ff..9ea9c2f 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -1,12 +1,12 @@
 /*
  * Copyright (C) 2008 The Android Open Source Project
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
- * 
+ *
  * http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
@@ -22,12 +22,11 @@
 import android.util.Log;
 import android.view.View;
 
-import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
 
 /**
- * This class loads a dictionary and provides a list of suggestions for a given sequence of 
+ * This class loads a dictionary and provides a list of suggestions for a given sequence of
  * characters. This includes corrections and completions.
  */
 public class Suggest implements Dictionary.WordCallback {
@@ -108,11 +107,6 @@
         initPool();
     }
 
-    public Suggest(Context context, ByteBuffer byteBuffer) {
-        mMainDict = new BinaryDictionary(context, byteBuffer, DIC_MAIN);
-        initPool();
-    }
-
     private void initPool() {
         for (int i = 0; i < mPrefMaxSuggestions; i++) {
             StringBuilder sb = new StringBuilder(getApproxMaxWordLength());
@@ -154,7 +148,7 @@
     public void setContactsDictionary(Dictionary userDictionary) {
         mContactsDictionary = userDictionary;
     }
-    
+
     public void setAutoDictionary(Dictionary autoDictionary) {
         mAutoDictionary = autoDictionary;
     }
@@ -232,7 +226,7 @@
 
             if (!TextUtils.isEmpty(prevWordForBigram)) {
                 CharSequence lowerPrevWord = prevWordForBigram.toString().toLowerCase();
-                if (mMainDict.isValidWord(lowerPrevWord)) {
+                if (mMainDict != null && mMainDict.isValidWord(lowerPrevWord)) {
                     prevWordForBigram = lowerPrevWord;
                 }
                 if (mUserBigramDictionary != null) {
@@ -383,7 +377,7 @@
         return mHaveCorrection;
     }
 
-    private boolean compareCaseInsensitive(final String mLowerOriginalWord, 
+    private boolean compareCaseInsensitive(final String mLowerOriginalWord,
             final char[] word, final int offset, final int length) {
         final int originalLength = mLowerOriginalWord.length();
         if (originalLength == length && Character.isUpperCase(word[offset])) {
@@ -456,7 +450,7 @@
         System.arraycopy(priorities, pos, priorities, pos + 1, prefMaxSuggestions - pos - 1);
         priorities[pos] = freq;
         int poolSize = mStringPool.size();
-        StringBuilder sb = poolSize > 0 ? (StringBuilder) mStringPool.remove(poolSize - 1) 
+        StringBuilder sb = poolSize > 0 ? (StringBuilder) mStringPool.remove(poolSize - 1)
                 : new StringBuilder(getApproxMaxWordLength());
         sb.setLength(0);
         if (mIsAllUpperCase) {
@@ -510,7 +504,7 @@
                 || (mAutoDictionary != null && mAutoDictionary.isValidWord(word))
                 || (mContactsDictionary != null && mContactsDictionary.isValidWord(word));
     }
-    
+
     private void collectGarbage(ArrayList<CharSequence> suggestions, int prefMaxSuggestions) {
         int poolSize = mStringPool.size();
         int garbageSize = suggestions.size();
@@ -531,6 +525,23 @@
     public void close() {
         if (mMainDict != null) {
             mMainDict.close();
+            mMainDict = null;
+        }
+        if (mUserDictionary != null) {
+            mUserDictionary.close();
+            mUserDictionary = null;
+        }
+        if (mUserBigramDictionary != null) {
+            mUserBigramDictionary.close();
+            mUserBigramDictionary = null;
+        }
+        if (mContactsDictionary != null) {
+            mContactsDictionary.close();
+            mContactsDictionary = null;
+        }
+        if (mAutoDictionary != null) {
+            mAutoDictionary.close();
+            mAutoDictionary = null;
         }
     }
 }
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 9948448..6374292 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -15,12 +15,24 @@
 ** limitations under the License.
 */
 
+#define LOG_TAG "LatinIME: jni"
+
 #include "dictionary.h"
 #include "jni.h"
 
 #include <assert.h>
+#include <errno.h>
 #include <stdio.h>
 
+#ifdef USE_MMAP_FOR_DICTIONARY
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#else // USE_MMAP_FOR_DICTIONARY
+#include <stdlib.h>
+#endif // USE_MMAP_FOR_DICTIONARY
+
 // ----------------------------------------------------------------------------
 
 using namespace latinime;
@@ -37,24 +49,84 @@
     }
 }
 
-static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object, jobject dictDirectBuffer,
+static jint latinime_BinaryDictionary_open(JNIEnv *env, jobject object,
+        jstring apkFileName, jlong dictOffset, jlong dictSize,
         jint typedLetterMultiplier, jint fullWordMultiplier, jint maxWordLength, jint maxWords,
         jint maxAlternatives) {
-    void *dict = env->GetDirectBufferAddress(dictDirectBuffer);
-    if (dict == NULL) {
-        fprintf(stderr, "DICT: Dictionary buffer is null\n");
+    PROF_OPEN;
+    PROF_START(66);
+    const char *apkFileNameChars = env->GetStringUTFChars(apkFileName, NULL);
+    if (apkFileNameChars == NULL) {
+        LOGE("DICT: Can't get apk file name");
         return 0;
     }
-    Dictionary *dictionary = new Dictionary(dict, typedLetterMultiplier, fullWordMultiplier,
-            maxWordLength, maxWords, maxAlternatives);
-    return (jint) dictionary;
+    int fd = 0;
+    void *dictBuf = NULL;
+    int adjust = 0;
+#ifdef USE_MMAP_FOR_DICTIONARY
+    /* mmap version */
+    fd = open(apkFileNameChars, O_RDONLY);
+    if (fd < 0) {
+        LOGE("DICT: Can't open apk file. errno=%d", errno);
+        return 0;
+    }
+    int pagesize = getpagesize();
+    adjust = dictOffset % pagesize;
+    int adjDictOffset = dictOffset - adjust;
+    int adjDictSize = dictSize + adjust;
+    dictBuf = mmap(NULL, sizeof(char) * adjDictSize, PROT_READ, MAP_PRIVATE, fd, adjDictOffset);
+    if (dictBuf == MAP_FAILED) {
+        LOGE("DICT: Can't mmap dictionary file. errno=%d", errno);
+        return 0;
+    }
+    dictBuf = (void *)((char *)dictBuf + adjust);
+#else // USE_MMAP_FOR_DICTIONARY
+    /* malloc version */
+    FILE *file = NULL;
+    file = fopen(apkFileNameChars, "rb");
+    if (file == NULL) {
+        LOGE("DICT: Can't fopen apk file. errno=%d", errno);
+        return 0;
+    }
+    dictBuf = malloc(sizeof(char) * dictSize);
+    if (dictBuf == NULL) {
+        LOGE("DICT: Can't allocate memory region for dictionary. errno=%d", errno);
+        return 0;
+    }
+    int ret = fseek(file, (long)dictOffset, SEEK_SET);
+    if (ret != 0) {
+        LOGE("DICT: Failure in fseek. ret=%d errno=%d", ret, errno);
+        return 0;
+    }
+    ret = fread(dictBuf, sizeof(char) * dictSize, 1, file);
+    if (ret != 1) {
+        LOGE("DICT: Failure in fread. ret=%d errno=%d", ret, errno);
+        return 0;
+    }
+    ret = fclose(file);
+    if (ret != 0) {
+        LOGE("DICT: Failure in fclose. ret=%d errno=%d", ret, errno);
+        return 0;
+    }
+#endif // USE_MMAP_FOR_DICTIONARY
+    env->ReleaseStringUTFChars(apkFileName, apkFileNameChars);
+
+    if (!dictBuf) {
+        LOGE("DICT: dictBuf is null");
+        return 0;
+    }
+    Dictionary *dictionary = new Dictionary(dictBuf, dictSize, fd, adjust, typedLetterMultiplier,
+            fullWordMultiplier, maxWordLength, maxWords, maxAlternatives);
+    PROF_END(66);
+    PROF_CLOSE;
+    return (jint)dictionary;
 }
 
 static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jobject object, jint dict,
         jintArray inputArray, jint arraySize, jcharArray outputArray, jintArray frequencyArray,
         jintArray nextLettersArray, jint nextLettersSize) {
-    Dictionary *dictionary = (Dictionary*) dict;
-    if (dictionary == NULL) return 0;
+    Dictionary *dictionary = (Dictionary*)dict;
+    if (!dictionary) return 0;
 
     int *frequencies = env->GetIntArrayElements(frequencyArray, NULL);
     int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
@@ -79,8 +151,8 @@
         jcharArray prevWordArray, jint prevWordLength, jintArray inputArray, jint inputArraySize,
         jcharArray outputArray, jintArray frequencyArray, jint maxWordLength, jint maxBigrams,
         jint maxAlternatives) {
-    Dictionary *dictionary = (Dictionary*) dict;
-    if (dictionary == NULL) return 0;
+    Dictionary *dictionary = (Dictionary*)dict;
+    if (!dictionary) return 0;
 
     jchar *prevWord = env->GetCharArrayElements(prevWordArray, NULL);
     int *inputCodes = env->GetIntArrayElements(inputArray, NULL);
@@ -99,11 +171,10 @@
     return count;
 }
 
-
 static jboolean latinime_BinaryDictionary_isValidWord(JNIEnv *env, jobject object, jint dict,
         jcharArray wordArray, jint wordLength) {
-    Dictionary *dictionary = (Dictionary*) dict;
-    if (dictionary == NULL) return (jboolean) false;
+    Dictionary *dictionary = (Dictionary*)dict;
+    if (!dictionary) return (jboolean) false;
 
     jchar *word = env->GetCharArrayElements(wordArray, NULL);
     jboolean result = dictionary->isValidWord((unsigned short*) word, wordLength);
@@ -113,13 +184,30 @@
 }
 
 static void latinime_BinaryDictionary_close(JNIEnv *env, jobject object, jint dict) {
-    delete (Dictionary*) dict;
+    Dictionary *dictionary = (Dictionary*)dict;
+    if (!dictionary) return;
+    void *dictBuf = dictionary->getDict();
+    if (!dictBuf) return;
+#ifdef USE_MMAP_FOR_DICTIONARY
+    int ret = munmap((void *)((char *)dictBuf - dictionary->getDictBufAdjust()),
+            dictionary->getDictSize() + dictionary->getDictBufAdjust());
+    if (ret != 0) {
+        LOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
+    }
+    ret = close(dictionary->getMmapFd());
+    if (ret != 0) {
+        LOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
+    }
+#else // USE_MMAP_FOR_DICTIONARY
+    free(dictBuf);
+#endif // USE_MMAP_FOR_DICTIONARY
+    delete dictionary;
 }
 
 // ----------------------------------------------------------------------------
 
 static JNINativeMethod gMethods[] = {
-    {"openNative", "(Ljava/nio/ByteBuffer;IIIII)I", (void*)latinime_BinaryDictionary_open},
+    {"openNative", "(Ljava/lang/String;JJIIIII)I", (void*)latinime_BinaryDictionary_open},
     {"closeNative", "(I)V", (void*)latinime_BinaryDictionary_close},
     {"getSuggestionsNative", "(I[II[C[I[II)I", (void*)latinime_BinaryDictionary_getSuggestions},
     {"isValidWordNative", "(I[CI)Z", (void*)latinime_BinaryDictionary_isValidWord},
@@ -132,11 +220,11 @@
 
     clazz = env->FindClass(className);
     if (clazz == NULL) {
-        fprintf(stderr, "Native registration unable to find class '%s'\n", className);
+        LOGE("Native registration unable to find class '%s'", className);
         return JNI_FALSE;
     }
     if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
-        fprintf(stderr, "RegisterNatives failed for '%s'\n", className);
+        LOGE("RegisterNatives failed for '%s'", className);
         return JNI_FALSE;
     }
 
@@ -157,13 +245,13 @@
     jint result = -1;
 
     if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
-        fprintf(stderr, "ERROR: GetEnv failed\n");
+        LOGE("ERROR: GetEnv failed");
         goto bail;
     }
     assert(env != NULL);
 
     if (!registerNatives(env)) {
-        fprintf(stderr, "ERROR: BinaryDictionary native registration failed\n");
+        LOGE("ERROR: BinaryDictionary native registration failed");
         goto bail;
     }
 
diff --git a/native/src/bigram_dictionary.cpp b/native/src/bigram_dictionary.cpp
index eebd69b..5ec310f 100644
--- a/native/src/bigram_dictionary.cpp
+++ b/native/src/bigram_dictionary.cpp
@@ -31,7 +31,7 @@
     MAX_ALTERNATIVES(maxAlternatives), IS_LATEST_DICT_VERSION(isLatestDictVersion),
     HAS_BIGRAM(hasBigram), mParentDictionary(parentDictionary) {
     if (DEBUG_DICT) LOGI("BigramDictionary - constructor");
-    if (DEBUG_DICT) LOGI("Has Bigram : %d \n", hasBigram);
+    if (DEBUG_DICT) LOGI("Has Bigram : %d", hasBigram);
 }
 
 BigramDictionary::~BigramDictionary() {
@@ -42,7 +42,7 @@
     if (DEBUG_DICT) {
         char s[length + 1];
         for (int i = 0; i <= length; i++) s[i] = word[i];
-        LOGI("Bigram: Found word = %s, freq = %d : \n", s, frequency);
+        LOGI("Bigram: Found word = %s, freq = %d :", s, frequency);
     }
 
     // Find the right insertion point
@@ -54,7 +54,7 @@
         }
         insertAt++;
     }
-    if (DEBUG_DICT) LOGI("Bigram: InsertAt -> %d maxBigrams: %d\n", insertAt, mMaxBigrams);
+    if (DEBUG_DICT) LOGI("Bigram: InsertAt -> %d maxBigrams: %d", insertAt, mMaxBigrams);
     if (insertAt < mMaxBigrams) {
         memmove((char*) mBigramFreq + (insertAt + 1) * sizeof(mBigramFreq[0]),
                (char*) mBigramFreq + insertAt * sizeof(mBigramFreq[0]),
@@ -68,7 +68,7 @@
             *dest++ = *word++;
         }
         *dest = 0; // NULL terminate
-        if (DEBUG_DICT) LOGI("Bigram: Added word at %d\n", insertAt);
+        if (DEBUG_DICT) LOGI("Bigram: Added word at %d", insertAt);
         return true;
     }
     return false;
@@ -107,7 +107,7 @@
     if (HAS_BIGRAM && IS_LATEST_DICT_VERSION) {
         int pos = mParentDictionary->isValidWordRec(
                 DICTIONARY_HEADER_SIZE, prevWord, 0, prevWordLength);
-        if (DEBUG_DICT) LOGI("Pos -> %d\n", pos);
+        if (DEBUG_DICT) LOGI("Pos -> %d", pos);
         if (pos < 0) {
             return 0;
         }
@@ -151,7 +151,7 @@
         }
         pos = followDownBranchAddress; // pos start at count
         int count = DICT[pos] & 0xFF;
-        if (DEBUG_DICT) LOGI("count - %d\n",count);
+        if (DEBUG_DICT) LOGI("count - %d",count);
         pos++;
         for (int i = 0; i < count; i++) {
             // pos at data
diff --git a/native/src/defines.h b/native/src/defines.h
index 59eaa41..71aaf28 100644
--- a/native/src/defines.h
+++ b/native/src/defines.h
@@ -36,45 +36,47 @@
 static double profile_old[PROF_BUF_SIZE];
 static unsigned int profile_counter[PROF_BUF_SIZE];
 
-#define PROF_RESET prof_reset();
-#define PROF_COUNT(prof_buf_id) ++profile_counter[prof_buf_id];
-#define PROF_OPEN PROF_RESET;PROF_START(PROF_BUF_SIZE - 1);
-#define PROF_START(prof_buf_id) PROF_COUNT(prof_buf_id);profile_old[prof_buf_id] = (clock());
-#define PROF_CLOSE PROF_END(PROF_BUF_SIZE - 1);PROF_OUTALL;
-#define PROF_END(prof_buf_id) profile_buf[prof_buf_id] += ((clock()) - profile_old[prof_buf_id]);
-#define PROF_CLOCKOUT(prof_buf_id) LOGI("%s : clock is %f", __FUNCTION__,\
-        (clock() - profile_old[prof_buf_id]));
-#define PROF_OUTALL LOGI("--- %s ---", __FUNCTION__); prof_out();
+#define PROF_RESET               prof_reset()
+#define PROF_COUNT(prof_buf_id)  ++profile_counter[prof_buf_id]
+#define PROF_OPEN                do { PROF_RESET; PROF_START(PROF_BUF_SIZE - 1); } while(0)
+#define PROF_START(prof_buf_id)  do { \
+        PROF_COUNT(prof_buf_id); profile_old[prof_buf_id] = (clock()); } while(0)
+#define PROF_CLOSE               do { PROF_END(PROF_BUF_SIZE - 1); PROF_OUTALL; } while(0)
+#define PROF_END(prof_buf_id)    profile_buf[prof_buf_id] += ((clock()) - profile_old[prof_buf_id])
+#define PROF_CLOCKOUT(prof_buf_id) \
+        LOGI("%s : clock is %f", __FUNCTION__, (clock() - profile_old[prof_buf_id]))
+#define PROF_OUTALL              do { LOGI("--- %s ---", __FUNCTION__); prof_out(); } while(0)
 
-static void prof_reset(void){
-    for(int i = 0;i < PROF_BUF_SIZE;++i){
+static void prof_reset(void) {
+    for (int i = 0; i < PROF_BUF_SIZE; ++i) {
         profile_buf[i] = 0;
         profile_old[i] = 0;
         profile_counter[i] = 0;
     }
 }
 
-static void prof_out(void){
+static void prof_out(void) {
     if (profile_counter[PROF_BUF_SIZE - 1] != 1) {
         LOGI("Error: You must call PROF_OPEN before PROF_CLOSE.");
     }
     LOGI("Total time is %6.3f ms.",
-            profile_buf[PROF_BUF_SIZE - 1] * 1000 / (double) CLOCKS_PER_SEC);
+            profile_buf[PROF_BUF_SIZE - 1] * 1000 / (double)CLOCKS_PER_SEC);
     double all = 0;
-    for(int i = 0; i < PROF_BUF_SIZE - 1; ++i){
+    for (int i = 0; i < PROF_BUF_SIZE - 1; ++i) {
         all += profile_buf[i];
     }
-    if(all == 0) all = 1;
-    for(int i = 0; i < PROF_BUF_SIZE - 1; ++i){
-        if(profile_buf[i] != 0) {
+    if (all == 0) all = 1;
+    for (int i = 0; i < PROF_BUF_SIZE - 1; ++i) {
+        if (profile_buf[i] != 0) {
             LOGI("(%d): Used %4.2f%%, %8.4f ms. Called %d times.",
-                    i, (profile_buf[i] * 100 /all),
-                    profile_buf[i] * 1000 / (double) CLOCKS_PER_SEC, profile_counter[i]);
-         }
+                    i, (profile_buf[i] * 100 / all),
+                    profile_buf[i] * 1000 / (double)CLOCKS_PER_SEC, profile_counter[i]);
+        }
     }
 }
 
 #else // FLAG_DBG
+#define LOGE
 #define LOGI
 #define DEBUG_DICT false
 #define DEBUG_DICT_FULL false
@@ -99,6 +101,11 @@
 #define U_SHORT_MAX 1 << 16
 #endif
 
+// Define this to use mmap() for dictionary loading.  Undefine to use malloc() instead of mmap().
+// We measured and compared performance of both, and found mmap() is fairly good in terms of
+// loading time, and acceptable even for several initial lookups which involve page faults.
+#define USE_MMAP_FOR_DICTIONARY
+
 // 22-bit address = ~4MB dictionary size limit, which on average would be about 200k-300k words
 #define ADDRESS_MASK 0x3FFFFF
 
diff --git a/native/src/dictionary.cpp b/native/src/dictionary.cpp
index 8d32909..fe33757 100644
--- a/native/src/dictionary.cpp
+++ b/native/src/dictionary.cpp
@@ -23,21 +23,23 @@
 
 namespace latinime {
 
-Dictionary::Dictionary(void *dict, int typedLetterMultiplier, int fullWordMultiplier,
+Dictionary::Dictionary(void *dict, int dictSize, int mmapFd, int dictBufAdjust,
+        int typedLetterMultiplier, int fullWordMultiplier,
         int maxWordLength, int maxWords, int maxAlternatives)
-    : DICT((unsigned char*) dict),
+    : mDict((unsigned char*) dict), mDictSize(dictSize),
+    mMmapFd(mmapFd), mDictBufAdjust(dictBufAdjust),
     // Checks whether it has the latest dictionary or the old dictionary
     IS_LATEST_DICT_VERSION((((unsigned char*) dict)[0] & 0xFF) >= DICTIONARY_VERSION_MIN) {
     if (DEBUG_DICT) {
         if (MAX_WORD_LENGTH_INTERNAL < maxWordLength) {
             LOGI("Max word length (%d) is greater than %d",
                     maxWordLength, MAX_WORD_LENGTH_INTERNAL);
-            LOGI("IN NATIVE SUGGEST Version: %d \n", (DICT[0] & 0xFF));
+            LOGI("IN NATIVE SUGGEST Version: %d", (mDict[0] & 0xFF));
         }
     }
-    mUnigramDictionary = new UnigramDictionary(DICT, typedLetterMultiplier, fullWordMultiplier,
+    mUnigramDictionary = new UnigramDictionary(mDict, typedLetterMultiplier, fullWordMultiplier,
             maxWordLength, maxWords, maxAlternatives, IS_LATEST_DICT_VERSION);
-    mBigramDictionary = new BigramDictionary(DICT, maxWordLength, maxAlternatives,
+    mBigramDictionary = new BigramDictionary(mDict, maxWordLength, maxAlternatives,
             IS_LATEST_DICT_VERSION, hasBigram(), this);
 }
 
@@ -47,7 +49,7 @@
 }
 
 bool Dictionary::hasBigram() {
-    return ((DICT[1] & 0xFF) == 1);
+    return ((mDict[1] & 0xFF) == 1);
 }
 
 // TODO: use uint16_t instead of unsigned short
@@ -64,12 +66,12 @@
     // returns address of bigram data of that word
     // return -99 if not found
 
-    int count = Dictionary::getCount(DICT, &pos);
+    int count = Dictionary::getCount(mDict, &pos);
     unsigned short currentChar = (unsigned short) word[offset];
     for (int j = 0; j < count; j++) {
-        unsigned short c = Dictionary::getChar(DICT, &pos);
-        int terminal = Dictionary::getTerminal(DICT, &pos);
-        int childPos = Dictionary::getAddress(DICT, &pos);
+        unsigned short c = Dictionary::getChar(mDict, &pos);
+        int terminal = Dictionary::getTerminal(mDict, &pos);
+        int childPos = Dictionary::getAddress(mDict, &pos);
         if (c == currentChar) {
             if (offset == length - 1) {
                 if (terminal) {
@@ -85,7 +87,7 @@
             }
         }
         if (terminal) {
-            Dictionary::getFreq(DICT, IS_LATEST_DICT_VERSION, &pos);
+            Dictionary::getFreq(mDict, IS_LATEST_DICT_VERSION, &pos);
         }
         // There could be two instances of each alphabet - upper and lower case. So continue
         // looking ...
diff --git a/native/src/dictionary.h b/native/src/dictionary.h
index da87624..cef1cf9 100644
--- a/native/src/dictionary.h
+++ b/native/src/dictionary.h
@@ -25,8 +25,8 @@
 
 class Dictionary {
 public:
-    Dictionary(void *dict, int typedLetterMultipler, int fullWordMultiplier, int maxWordLength,
-            int maxWords, int maxAlternatives);
+    Dictionary(void *dict, int dictSize, int mmapFd, int dictBufAdjust, int typedLetterMultipler,
+            int fullWordMultiplier, int maxWordLength, int maxWords, int maxAlternatives);
     int getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
             int *nextLetters, int nextLettersSize) {
         return mUnigramDictionary->getSuggestions(codes, codesSize, outWords, frequencies,
@@ -42,8 +42,10 @@
     }
     bool isValidWord(unsigned short *word, int length);
     int isValidWordRec(int pos, unsigned short *word, int offset, int length);
-    void setAsset(void *asset) { mAsset = asset; }
-    void *getAsset() { return mAsset; }
+    void *getDict() { return (void *)mDict; }
+    int getDictSize() { return mDictSize; }
+    int getMmapFd() { return mMmapFd; }
+    int getDictBufAdjust() { return mDictBufAdjust; }
     ~Dictionary();
 
     // public static utility methods
@@ -62,11 +64,17 @@
 private:
     bool hasBigram();
 
-    const unsigned char *DICT;
+    const unsigned char *mDict;
+
+    // Used only for the mmap version of dictionary loading, but we use these as dummy variables
+    // also for the malloc version.
+    const int mDictSize;
+    const int mMmapFd;
+    const int mDictBufAdjust;
+
     const bool IS_LATEST_DICT_VERSION;
-    void *mAsset;
-    BigramDictionary *mBigramDictionary;
     UnigramDictionary *mUnigramDictionary;
+    BigramDictionary *mBigramDictionary;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/native/src/unigram_dictionary.cpp b/native/src/unigram_dictionary.cpp
index af2cc97..3f9bcd7 100644
--- a/native/src/unigram_dictionary.cpp
+++ b/native/src/unigram_dictionary.cpp
@@ -113,7 +113,6 @@
                 LOGI("%c = %d,", k, nextLetters[k]);
             }
         }
-        LOGI("\n");
     }
     PROF_END(6);
     PROF_CLOSE;
diff --git a/native/src/unigram_dictionary.h b/native/src/unigram_dictionary.h
index 445ff7a..7f7b7bd 100644
--- a/native/src/unigram_dictionary.h
+++ b/native/src/unigram_dictionary.h
@@ -80,13 +80,13 @@
     bool existsAdjacentProximityChars(const int inputIndex, const int inputLength);
     int* getInputCharsAt(const int index) {return mInputCodes + (index * MAX_PROXIMITY_CHARS);}
     const unsigned char *DICT;
-    const int MAX_WORDS;
     const int MAX_WORD_LENGTH;
+    const int MAX_WORDS;
     const int MAX_PROXIMITY_CHARS;
     const bool IS_LATEST_DICT_VERSION;
-    const int ROOT_POS;
     const int TYPED_LETTER_MULTIPLIER;
     const int FULL_WORD_MULTIPLIER;
+    const int ROOT_POS;
 
     int *mFrequencies;
     unsigned short *mOutputChars;
diff --git a/tests/src/com/android/inputmethod/latin/SuggestHelper.java b/tests/src/com/android/inputmethod/latin/SuggestHelper.java
index 7254520..de898c3 100644
--- a/tests/src/com/android/inputmethod/latin/SuggestHelper.java
+++ b/tests/src/com/android/inputmethod/latin/SuggestHelper.java
@@ -38,49 +38,15 @@
     private final String TAG;
 
     /** Uses main dictionary only **/
-    public SuggestHelper(String tag, Context context, int[] resId) {
+    public SuggestHelper(String tag, Context context, int resId) {
         TAG = tag;
-        InputStream[] is = null;
-        try {
-            // merging separated dictionary into one if dictionary is separated
-            int total = 0;
-            is = new InputStream[resId.length];
-            for (int i = 0; i < resId.length; i++) {
-                is[i] = context.getResources().openRawResource(resId[i]);
-                total += is[i].available();
-            }
-
-            ByteBuffer byteBuffer =
-                ByteBuffer.allocateDirect(total).order(ByteOrder.nativeOrder());
-            int got = 0;
-            for (int i = 0; i < resId.length; i++) {
-                 got += Channels.newChannel(is[i]).read(byteBuffer);
-            }
-            if (got != total) {
-                Log.w(TAG, "Read " + got + " bytes, expected " + total);
-            } else {
-                mSuggest = new Suggest(context, byteBuffer);
-                Log.i(TAG, "Created mSuggest " + total + " bytes");
-            }
-        } catch (IOException e) {
-            Log.w(TAG, "No available memory for binary dictionary");
-        } finally {
-            try {
-                if (is != null) {
-                    for (int i = 0; i < is.length; i++) {
-                        is[i].close();
-                    }
-                }
-            } catch (IOException e) {
-                Log.w(TAG, "Failed to close input stream");
-            }
-        }
+        mSuggest = new Suggest(context, resId);
         mSuggest.setAutoTextEnabled(false);
         mSuggest.setCorrectionMode(Suggest.CORRECTION_FULL_BIGRAM);
     }
 
     /** Uses both main dictionary and user-bigram dictionary **/
-    public SuggestHelper(String tag, Context context, int[] resId, int userBigramMax,
+    public SuggestHelper(String tag, Context context, int resId, int userBigramMax,
             int userBigramDelete) {
         this(tag, context, resId);
         mUserBigram = new UserBigramDictionary(context, null, Locale.US.toString(),
diff --git a/tests/src/com/android/inputmethod/latin/SuggestPerformanceTests.java b/tests/src/com/android/inputmethod/latin/SuggestPerformanceTests.java
index 7eb66d5..c5913ab 100644
--- a/tests/src/com/android/inputmethod/latin/SuggestPerformanceTests.java
+++ b/tests/src/com/android/inputmethod/latin/SuggestPerformanceTests.java
@@ -36,9 +36,9 @@
 
         // For testing with real dictionary, TEMPORARILY COPY main dictionary into test directory.
         // DO NOT SUBMIT real dictionary under test directory.
-        //int[] resId = new int[] { R.raw.main0, R.raw.main1, R.raw.main2 };
+        //int resId = R.raw.main;
 
-        int[] resId = new int[] { R.raw.test };
+        int resId = R.raw.test;
 
         sh = new SuggestHelper(TAG, getTestContext(), resId);
         loadString();
diff --git a/tests/src/com/android/inputmethod/latin/SuggestTests.java b/tests/src/com/android/inputmethod/latin/SuggestTests.java
index 33462dc..c890394 100644
--- a/tests/src/com/android/inputmethod/latin/SuggestTests.java
+++ b/tests/src/com/android/inputmethod/latin/SuggestTests.java
@@ -26,7 +26,7 @@
 
     @Override
     protected void setUp() {
-        int[] resId = new int[] { R.raw.test };
+        int resId = R.raw.test;
         sh = new SuggestHelper(TAG, getTestContext(), resId);
     }
 
diff --git a/tests/src/com/android/inputmethod/latin/UserBigramTests.java b/tests/src/com/android/inputmethod/latin/UserBigramTests.java
index cbf7bd8..af527b0 100644
--- a/tests/src/com/android/inputmethod/latin/UserBigramTests.java
+++ b/tests/src/com/android/inputmethod/latin/UserBigramTests.java
@@ -31,7 +31,7 @@
 
     @Override
     protected void setUp() {
-        int[] resId = new int[] { R.raw.test };
+        int resId = R.raw.test;
         sh = new SuggestHelper(TAG, getTestContext(), resId, MAX_DATA, DELETE_DATA);
     }