Diff to speed up commit time in git

gistfile1.c

diff --git a/builtin/commit.c b/builtin/commit.c
index 66ffe31..c661135 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -411,7 +411,7 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	 */
 	if (!pathspec || !*pathspec) {
 		fd = hold_locked_index(&index_lock, 1);
-		refresh_cache_or_die(refresh_flags);
+		//refresh_cache_or_die(refresh_flags);
 		if (active_cache_changed) {
 			if (write_cache(fd, active_cache, active_nr) ||
 			    commit_locked_index(&index_lock))
@@ -859,15 +859,15 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	 * and write it out as a tree.  We must do this before we invoke
 	 * the editor and after we invoke run_status above.
 	 */
-	discard_cache();
-	read_cache_from(index_file);
-	if (!active_cache_tree)
-		active_cache_tree = cache_tree();
-	if (cache_tree_update(active_cache_tree,
-			      active_cache, active_nr, 0, 0) < 0) {
-		error(_("Error building trees"));
-		return 0;
-	}
+        //discard_cache();
+           //	read_cache_from(index_file);
+       if (!active_cache_tree)
+           active_cache_tree = cache_tree();
+       if (cache_tree_update(active_cache_tree,
+                             active_cache, active_nr, 1, 0) < 0) {
+         error(_("Error building trees"));
+         return 0;
+       }
 
 	if (run_hook(index_file, "prepare-commit-msg",
 		     git_path(commit_editmsg), hook_arg1, hook_arg2, NULL))