A xda user slaid480 has compiled a list of build.prop tweaks that can be applied to Samsung Galaxy Ace irrespective of the firmware.
Requirements:
- Root privileges & a cool + calm head!
Instructions:
- Open “Root Explorer” and click the R/W
- Go to /system/build.prop.
- Backup yout current build.prop.
- Long-press on Build.Prop and you’ll see a pop up.
- Select ‘Text Editor’.

- Edit values if already a line is already present in build.prop file. Otherwise add at the end of the file & save.
- Reboot and enjoy.
Data Tweaks: Increase download/upload/3G speeds
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.ril.hep=1
ro.ril.enable.dtm=0
ro.ril.hsdpa.category=8 (or 10,12,14) Still looking for more of these though.
ro.ril.enable.a53=1
ro.ril.enable.3g.prefix=1
ro.ril.htcmaskw1.bitmask=4294967295
ro.ril.htcmaskw1=14449
ro.ril.hsupa.category=6
POWER SAVES
Allows the phone to sleep better
ro.ril.disable.power.collapse=1
Saves power when phone is in sleep mode
pm.sleep_mode=1
Allows your wifi to scan less frequently, saving more battery
wifi.supplicant_scan_interval=150 or 180
Helps Scrolling Response
windowsmgr.max_events_per_sec=150
Increases overall touch response
Debug.performance.tuning=1
Video.accelerate.hw=1
SYSTEM TWEAKS
Forces your home screen launcher to remain in memory
ro.HOME_APP_ADJ=1
Change the Dalvik VM heap size
dalvik.vm.heapsize=64m
can use 24,32,48,64. 32 is default.
To disable USB debugging popup
persist.adb.notify=0
Fix some application issues
ro.kernel.android.checkjni=0
Render UI with GPU (Not Recommended for stock GB)
debug.sf.hw=1
[via xda-developers]