You might want to read this XDA-developer’s news: Changing from a deodexed to odexed system modifies the method in which your Dalvik VM works. Full details are included in the readme file, including instructions for manual operation and running from the handset instead of via adb.
Users of the Samsung Epic 4G may hunger after increased speeds and reduced memory usage by changing (back) from a deodexed system to an odexed system.OneClickOdexer is an odexing and restoration tool for deodexed ROMs by XDA forum member tanimn. It will automatically odex your ROM or restore to a deodexed state with one click. If a critical error occurs the app will return your phone to it’s previous state. The dev states that care has been taken to only odex apps that come stock with an odex file.
the original article can be found by clicking here .