I found solution from alin.p. So here is a nice tutorial:
You have to flash it de-odexed first, then odex whatever part of your system you want with the Universal Odex Script which you'll find in the Mini forums, then extract the odex files from:
1. /system/app if you odexed system apps
2. /system/framework if you odexed the bootstrap or the framework
Put the extracted files inside the zip in the appropriate folders.
A little warning here: even a single (no matter how little) change inside the framework code, will break the whole ROM if it is odexed.