updated for version 7.4.396
Problem:    When 'clipboard' is "unnamed", :g/pat/d is very slow. (Praful)
Solution:   Only set the clipboard after the last delete. (Christian Brabandt)
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 62621bf..df6700d 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -5514,7 +5514,15 @@
 	    smsg((char_u *)_("Pattern not found: %s"), pat);
     }
     else
+    {
+#ifdef FEAT_CLIPBOARD
+	start_global_changes();
+#endif
 	global_exe(cmd);
+#ifdef FEAT_CLIPBOARD
+	end_global_changes();
+#endif
+    }
 
     ml_clearmarked();	   /* clear rest of the marks */
     vim_regfree(regmatch.regprog);