Zip Align reduces the amount of RAM used during processing running for a major speed increase in dex-opt and running the apps, along with the RAM hack and a CC (or your userinit) boots speeds incredibly and better usability of apps (boot and system) in Android: http://developer.android.com/guide/d.../zipalign.html
Most developers have not used this yet (CM does ZipAlign his apps), but this does for the system apps provided from the now old Google Apps
Since the 1.6 SDK was released, the ADT does this automatically on APK export. Therefore any app which has been updated since ~September (and was developed using the ADT Eclipse plugin) will be zipalign'd. I was more surprised that 12 out of the 43 apps on my phone weren't aligned!
su mount -o remount,rw /system mv /sdcard/zipalign /system/bin mv /sdcard/zipalign_apks /system/sd/zipalign_apks.sh chmod 755 /system/bin/zipalign /system/sd/zipalign_apks.sh mount -o remount,ro /system
zipalign -f -v 4 E:\app\theapp.apk E:\app\theapp.apk.out
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