[Tutorial][Tweak][Deodex] Disable verify-bytecode!

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First of all, i take no credit for this. Thanks to nibras_reeza for this tweak! I've tested this for SGA and I can feel an even better performance boost though i'm already using Grif_07's CM7.1 Kang Beta 2! You can go to the original thread here - Get more RAM and faster responses by disabling verify-bytecode!. I've added some instructions that would be more applicable for Ace.

You'll need:

• Terminal Emulator
• CWM
• Root Explorer or File Expert (or any file manager that has root access)

This tweak will give a performance boost in deodexed ROMs as much as odexing system & data apps. This is an alternative for odexing.


1) Open Terminal Emulator on phone or adb shell from PC and type the following.

su
setprop dalvik.vm.verify-bytecode false
setprop dalvik.vm.dexopt-flags v=n,o=v
reboot recovery

2) Wipe both caches and reboot system

3) Open root explorer, go to /system/ and edit build.prop in R/W mode then add these lines:

dalvik.vm.verify-bytecode = false
dalvik.vm.dexopt-flags=v=n,o=v

If lines starting with dalvik.vm.verify-bytecode or dalvik.vm.dexopt-flags exist already, please modify them as above. Note that there might be two entries for dalvik.vm.dexopt-flags; remove the second one.

4) After saving build.prop, reboot to recovery then wipe both caches again.

5) Reboot system. Done.

Originally Posted by nibras_reeza

Advantages:

• More free RAM.
• Faster launch for system & user apps during the second launch.
• Gives as much as of a performance boost as ODEX without odexing. Themer friendly.
• Smoother app switching.

Disadvantages:

• Might break some apps.

You can read more information about this on here and here.

To undo this tweak,

Type the following in Teminal Emulator.

su
setprop dalvik.vm.verify-bytecode true
reboot recovery

Then wipe both caches then reboot.

Anyone can comment on this tweak? I don't know about it, but it sounds a little bit extreme on the phone :S

Just did everything as described. Nothing bad happened. Improvements have not yet seen it.

Originally Posted by AlterJack

Anyone can comment on this tweak? I don't know about it, but it sounds a little bit extreme on the phone :S

Yup, requires a bit of experience in Android tweaking.. but i can say my phone's definitely faster

Done, can't see any changes, hope Ill see em soon

After the application of this method arises a problem: SGA freezes after extract and reinsert the SD.
Already, four people can attest.

Originally Posted by Lovetz

After the application of this method arises a problem: SGA freezes after extract and reinsert the SD.
Already, four people can attest.

uh oh. i did not try to extract/reinsert SD yet.
but can reboot solve the problem?

Originally Posted by mundixx

uh oh. i did not try to extract/reinsert SD yet.
but can reboot solve the problem?

yeah reboot cures freeze, but only once, next time u extract/reinsert your SD, phone will freeze again, undoing this by using comand from first post, and replacing prop file with original made thing's worse, all apps after rebooting force closed. Reinstalling rom cured all problems.

Originally Posted by ak1t

yeah reboot cures freeze, but only once, next time u extract/reinsert your SD, phone will freeze again, undoing this by using comand from first post, and replacing prop file with original made thing's worse, all apps after rebooting force closed. Reinstalling rom cured all problems.

when you applied the code or restore the build.prop, did you clear both caches? that way, the system rebuilds it and prevents the force closes

Originally Posted by mundixx

when you applied the code or restore the build.prop, did you clear both caches? that way, the system rebuilds it and prevents the force closes

sure I cleared them