diff --git a/tools/aapt2/io/File.h b/tools/aapt2/io/File.h
index 422658a..08d497d 100644
--- a/tools/aapt2/io/File.h
+++ b/tools/aapt2/io/File.h
@@ -101,7 +101,7 @@
  public:
   virtual ~IFileCollection() = default;
 
-  virtual IFile* FindFile(const android::StringPiece& path) = 0;
+  virtual IFile* FindFile(android::StringPiece path) = 0;
   virtual std::unique_ptr<IFileCollectionIterator> Iterator() = 0;
   virtual char GetDirSeparator() = 0;
 };
diff --git a/tools/aapt2/io/FileSystem.cpp b/tools/aapt2/io/FileSystem.cpp
index 3f071af..a64982a 100644
--- a/tools/aapt2/io/FileSystem.cpp
+++ b/tools/aapt2/io/FileSystem.cpp
@@ -67,8 +67,8 @@
   return result;
 }
 
-std::unique_ptr<FileCollection> FileCollection::Create(const android::StringPiece& root,
-                                                        std::string* outError) {
+std::unique_ptr<FileCollection> FileCollection::Create(android::StringPiece root,
+                                                       std::string* outError) {
   std::unique_ptr<FileCollection> collection =
       std::unique_ptr<FileCollection>(new FileCollection());
 
@@ -80,7 +80,7 @@
 
   std::vector<std::string> sorted_files;
   while (struct dirent *entry = readdir(d.get())) {
-    std::string prefix_path = root.to_string();
+    std::string prefix_path(root);
     file::AppendPath(&prefix_path, entry->d_name);
 
     // The directory to iterate over looking for files
@@ -117,12 +117,19 @@
   return collection;
 }
 
-IFile* FileCollection::InsertFile(const StringPiece& path) {
-  return (files_[path.to_string()] = util::make_unique<RegularFile>(android::Source(path))).get();
+IFile* FileCollection::InsertFile(StringPiece path) {
+  auto file = util::make_unique<RegularFile>(android::Source(path));
+  auto it = files_.lower_bound(path);
+  if (it != files_.end() && it->first == path) {
+    it->second = std::move(file);
+  } else {
+    it = files_.emplace_hint(it, path, std::move(file));
+  }
+  return it->second.get();
 }
 
-IFile* FileCollection::FindFile(const StringPiece& path) {
-  auto iter = files_.find(path.to_string());
+IFile* FileCollection::FindFile(StringPiece path) {
+  auto iter = files_.find(path);
   if (iter != files_.end()) {
     return iter->second.get();
   }
diff --git a/tools/aapt2/io/FileSystem.h b/tools/aapt2/io/FileSystem.h
index bc03b9b..0e798fc 100644
--- a/tools/aapt2/io/FileSystem.h
+++ b/tools/aapt2/io/FileSystem.h
@@ -60,12 +60,11 @@
   FileCollection() = default;
 
   /** Creates a file collection containing all files contained in the specified root directory. */
-  static std::unique_ptr<FileCollection> Create(const android::StringPiece& path,
-                                                std::string* outError);
+  static std::unique_ptr<FileCollection> Create(android::StringPiece path, std::string* outError);
 
   // Adds a file located at path. Returns the IFile representation of that file.
-  IFile* InsertFile(const android::StringPiece& path);
-  IFile* FindFile(const android::StringPiece& path) override;
+  IFile* InsertFile(android::StringPiece path);
+  IFile* FindFile(android::StringPiece path) override;
   std::unique_ptr<IFileCollectionIterator> Iterator() override;
   char GetDirSeparator() override;
 
@@ -74,7 +73,7 @@
 
   friend class FileCollectionIterator;
 
-  std::map<std::string, std::unique_ptr<IFile>> files_;
+  std::map<std::string, std::unique_ptr<IFile>, std::less<>> files_;
 };
 
 }  // namespace io
diff --git a/tools/aapt2/io/StringStream.cpp b/tools/aapt2/io/StringStream.cpp
index 4ca04a8..9c49788 100644
--- a/tools/aapt2/io/StringStream.cpp
+++ b/tools/aapt2/io/StringStream.cpp
@@ -21,7 +21,7 @@
 namespace aapt {
 namespace io {
 
-StringInputStream::StringInputStream(const StringPiece& str) : str_(str), offset_(0u) {
+StringInputStream::StringInputStream(StringPiece str) : str_(str), offset_(0u) {
 }
 
 bool StringInputStream::Next(const void** data, size_t* size) {
diff --git a/tools/aapt2/io/StringStream.h b/tools/aapt2/io/StringStream.h
index f29890a..f7bdecca 100644
--- a/tools/aapt2/io/StringStream.h
+++ b/tools/aapt2/io/StringStream.h
@@ -29,7 +29,7 @@
 
 class StringInputStream : public KnownSizeInputStream {
  public:
-  explicit StringInputStream(const android::StringPiece& str);
+  explicit StringInputStream(android::StringPiece str);
 
   bool Next(const void** data, size_t* size) override;
 
diff --git a/tools/aapt2/io/Util.cpp b/tools/aapt2/io/Util.cpp
index afe54d4..79d8d52 100644
--- a/tools/aapt2/io/Util.cpp
+++ b/tools/aapt2/io/Util.cpp
@@ -26,7 +26,7 @@
 namespace aapt {
 namespace io {
 
-bool CopyInputStreamToArchive(IAaptContext* context, InputStream* in, const std::string& out_path,
+bool CopyInputStreamToArchive(IAaptContext* context, InputStream* in, std::string_view out_path,
                               uint32_t compression_flags, IArchiveWriter* writer) {
   TRACE_CALL();
   if (context->IsVerbose()) {
@@ -43,7 +43,7 @@
   return true;
 }
 
-bool CopyFileToArchive(IAaptContext* context, io::IFile* file, const std::string& out_path,
+bool CopyFileToArchive(IAaptContext* context, io::IFile* file, std::string_view out_path,
                        uint32_t compression_flags, IArchiveWriter* writer) {
   TRACE_CALL();
   std::unique_ptr<io::IData> data = file->OpenAsData();
@@ -56,13 +56,13 @@
 }
 
 bool CopyFileToArchivePreserveCompression(IAaptContext* context, io::IFile* file,
-                                          const std::string& out_path, IArchiveWriter* writer) {
+                                          std::string_view out_path, IArchiveWriter* writer) {
   uint32_t compression_flags = file->WasCompressed() ? ArchiveEntry::kCompress : 0u;
   return CopyFileToArchive(context, file, out_path, compression_flags, writer);
 }
 
 bool CopyProtoToArchive(IAaptContext* context, ::google::protobuf::Message* proto_msg,
-                        const std::string& out_path, uint32_t compression_flags,
+                        std::string_view out_path, uint32_t compression_flags,
                         IArchiveWriter* writer) {
   TRACE_CALL();
   if (context->IsVerbose()) {
@@ -110,7 +110,7 @@
   return !in->HadError();
 }
 
-bool Copy(OutputStream* out, const StringPiece& in) {
+bool Copy(OutputStream* out, StringPiece in) {
   const char* in_buffer = in.data();
   size_t in_len = in.size();
   while (in_len != 0) {
diff --git a/tools/aapt2/io/Util.h b/tools/aapt2/io/Util.h
index 1b48a28..685f522 100644
--- a/tools/aapt2/io/Util.h
+++ b/tools/aapt2/io/Util.h
@@ -17,12 +17,11 @@
 #ifndef AAPT_IO_UTIL_H
 #define AAPT_IO_UTIL_H
 
-#include <string>
-
-#include "google/protobuf/message.h"
-#include "google/protobuf/io/coded_stream.h"
+#include <string_view>
 
 #include "format/Archive.h"
+#include "google/protobuf/io/coded_stream.h"
+#include "google/protobuf/message.h"
 #include "io/File.h"
 #include "io/Io.h"
 #include "process/IResourceTableConsumer.h"
@@ -30,23 +29,23 @@
 namespace aapt {
 namespace io {
 
-bool CopyInputStreamToArchive(IAaptContext* context, InputStream* in, const std::string& out_path,
+bool CopyInputStreamToArchive(IAaptContext* context, InputStream* in, std::string_view out_path,
                               uint32_t compression_flags, IArchiveWriter* writer);
 
-bool CopyFileToArchive(IAaptContext* context, IFile* file, const std::string& out_path,
+bool CopyFileToArchive(IAaptContext* context, IFile* file, std::string_view out_path,
                        uint32_t compression_flags, IArchiveWriter* writer);
 
 bool CopyFileToArchivePreserveCompression(IAaptContext* context, IFile* file,
-                                          const std::string& out_path, IArchiveWriter* writer);
+                                          std::string_view out_path, IArchiveWriter* writer);
 
 bool CopyProtoToArchive(IAaptContext* context, ::google::protobuf::Message* proto_msg,
-                        const std::string& out_path, uint32_t compression_flags,
+                        std::string_view out_path, uint32_t compression_flags,
                         IArchiveWriter* writer);
 
 // Copies the data from in to out. Returns false if there was an error.
 // If there was an error, check the individual streams' HadError/GetError methods.
 bool Copy(OutputStream* out, InputStream* in);
-bool Copy(OutputStream* out, const ::android::StringPiece& in);
+bool Copy(OutputStream* out, android::StringPiece in);
 bool Copy(::google::protobuf::io::ZeroCopyOutputStream* out, InputStream* in);
 
 class OutputStreamAdaptor : public io::OutputStream {
diff --git a/tools/aapt2/io/ZipArchive.cpp b/tools/aapt2/io/ZipArchive.cpp
index 400269c..4a5385d 100644
--- a/tools/aapt2/io/ZipArchive.cpp
+++ b/tools/aapt2/io/ZipArchive.cpp
@@ -91,8 +91,8 @@
 
 ZipFileCollection::ZipFileCollection() : handle_(nullptr) {}
 
-std::unique_ptr<ZipFileCollection> ZipFileCollection::Create(
-    const StringPiece& path, std::string* out_error) {
+std::unique_ptr<ZipFileCollection> ZipFileCollection::Create(StringPiece path,
+                                                             std::string* out_error) {
   TRACE_CALL();
   constexpr static const int32_t kEmptyArchive = -6;
 
@@ -130,8 +130,8 @@
       continue;
     }
 
-    std::unique_ptr<IFile> file = util::make_unique<ZipFile>(
-        collection->handle_, zip_data, android::Source(zip_entry_path, path.to_string()));
+    std::unique_ptr<IFile> file = util::make_unique<ZipFile>(collection->handle_, zip_data,
+                                                             android::Source(zip_entry_path, path));
     collection->files_by_name_[zip_entry_path] = file.get();
     collection->files_.push_back(std::move(file));
   }
@@ -144,8 +144,8 @@
   return collection;
 }
 
-IFile* ZipFileCollection::FindFile(const StringPiece& path) {
-  auto iter = files_by_name_.find(path.to_string());
+IFile* ZipFileCollection::FindFile(StringPiece path) {
+  auto iter = files_by_name_.find(path);
   if (iter != files_by_name_.end()) {
     return iter->second;
   }
diff --git a/tools/aapt2/io/ZipArchive.h b/tools/aapt2/io/ZipArchive.h
index 78c9c21..c263aa4 100644
--- a/tools/aapt2/io/ZipArchive.h
+++ b/tools/aapt2/io/ZipArchive.h
@@ -61,10 +61,10 @@
 // An IFileCollection that represents a ZIP archive and the entries within it.
 class ZipFileCollection : public IFileCollection {
  public:
-  static std::unique_ptr<ZipFileCollection> Create(const android::StringPiece& path,
+  static std::unique_ptr<ZipFileCollection> Create(android::StringPiece path,
                                                    std::string* outError);
 
-  io::IFile* FindFile(const android::StringPiece& path) override;
+  io::IFile* FindFile(android::StringPiece path) override;
   std::unique_ptr<IFileCollectionIterator> Iterator() override;
   char GetDirSeparator() override;
 
@@ -76,7 +76,7 @@
 
   ZipArchiveHandle handle_;
   std::vector<std::unique_ptr<IFile>> files_;
-  std::map<std::string, IFile*> files_by_name_;
+  std::map<std::string, IFile*, std::less<>> files_by_name_;
 };
 
 }  // namespace io