[Samsung Galaxy Mini] helderfp:
this is what as inside buil.prop:

#!/system/bin/sh

#

#

#===============================

#===============================

# NOS-INJECTION BY EXIT_ONLY ===

#===============================

#===============================

#

#

# This script will injected a few build.prop tweaks into your current build.prop

# If you are on a ROM that has build.prop tweaks these will not over write the tweaks. You may end up with double entries in your build.prop

clear

echo ""

echo ""

echo ""

echo ""

echo ""

echo "========================================="

echo "= Build.prop Injector Script ="

echo "= Exit_Only @ XDA 2013 ="

echo "========================================="

echo ""

echo ""

echo ""

echo ""

echo ""

echo "Mounting /system as r/w..."

echo ""

busybox mount -o rw,remount /system

sleep 1

echo ""

echo "Adding DNS tweaks to build.prop..."

echo ""

busybox echo "net.dns1=127.0.0.1" >> /system/build.prop

busybox echo "net.rmnet0.dns1=127.0.0.1" >> /system/build.prop

busybox echo "net.wlan0.dns1=127.0.0.1" >> /system/build.prop

busybox echo "dhcp.wlan0.dns1=127.0.0.1" >> /system/build.prop

busybox echo "dhcp.eth0.dns1=127.0.0.1" >> /system/build.prop

busybox echo "net.dns2=8.8.4.4" >> /system/build.prop

busybox echo "net.rmnet0.dns2=8.8.4.4" >> /system/build.prop

busybox echo "net.wlan0.dns2=8.8.4.4" >> /system/build.prop

busybox echo "dhcp.wlan0.dns2=8.8.4.4" >> /system/build.prop

busybox echo "dhcp.eth0.dns2=8.8.4.4" >> /system/build.prop

busybox echo "net.wlan0.dns3=8.8.8.8" >> /system/build.prop

busybox echo "dhcp.wlan0.dns3=8.8.8.8" >> /system/build.prop

setprop dhcp.wlan0.dns3=8.8.8.8

busybox echo "dhcp.eth0.dns3=8.8.8.8" >> /system/build.prop

busybox echo "net.wlan0.dns4=208.67.222.222" >> /system/build.prop

busybox echo "dhcp.wlan0.dns4=208.67.222.222" >> /system/build.prop

busybox echo "dhcp.eth0.dns4=208.67.222.222" >> /system/build.prop

busybox echo "net.change=net.dnschange" >> /system/build.prop

busybox echo "ro.kernel.android.ndns=2" >> /system/build.prop

sleep 1

echo ""

echo "Setting battery saver build.prop tweaks..."

echo ""

busybox echo "pm.sleep_mode=1" >> /system/build.prop

busybox echo "ro.ril.disable.power.collapse=0" >> /system/build.prop

sleep 1

echo ""

echo "Adding debugging tweaks to build.prop..."

echo ""

busybox echo "debug.kill_allocating_task=0" >> /system/build.prop

busybox echo "debug.enabletr=true" >> /system/build.prop

busybox echo "debug.overlayui.enable=1" >> /system/build.prop

busybox echo "debug.performance.tuning=1" >> /system/build.prop

busybox echo "debug.sf.hw=1" >> /system/build.prop

busybox echo "debug.composition.type=gpu" >> /system/build.prop

busybox echo "debug.egl.hw=1" >> /system/build.prop

busybox echo "debug.enabletr=true" >> /system/build.prop

sleep 1

echo ""

echo "Adding media enhancing tweaks to build.prop..."

echo ""

busybox echo "ro.media.enc.jpeg.quality=100" >> /system/build.prop

busybox echo "ro.media.dec.jpeg.memcap=8000000" >> /system/build.prop

busybox echo "ro.media.enc.hprof.vid.bps=8000000" >> /system/build.prop

sleep 1

echo ""

echo "Adding Java tweaks to build.prop..."

echo ""

busybox echo "ro.kernel.android.checkjni=0 " >> /system/build.prop

busybox echo "ro.kernel.checkjni=0" >> /system/build.prop

sleep 1

echo ""

echo "Adding dalvik tweaks to build.prop..."

echo ""

busybox echo "dalvik.vm.execution-mode=int:fast" >> /system/build.prop

sleep 1

echo ""

echo "Adding misc tweaks to build.prop..."

echo ""

busybox echo "ro.HOME_APP_ADJ=1" >> /system/build.prop

busybox echo "persist.sys.NV_FPSLIMIT=90" >> /system/build.prop

sleep 1

echo ""

echo "Adding Performance tweaks to build.prop..."

echo ""

busybox echo "video.accelerate.hw=1" >> /system/build.prop

busybox echo "persist.sys.ui.hw=1" >> /system/build.prop

busybox echo "persist.sys.use_dithering=0" >> /system/build.prop

busybox echo "windowsmgr.max_events_per_sec=90" >> /system/build.prop

busybox echo "ro.max.fling_velocity=15000" >> /system/build.prop

busybox echo "ro.min.fling_velocity=10000" >> /system/build.prop

sleep 1

echo ""

echo "Adding sensor tweaks to build.prop..."

echo ""

busybox echo "ro.mot.buttonlight.timeout=0" >> /system/build.prop

busybox echo "ro.mot.eri.losalert.delay=1000" >> /system/build.prop

busybox echo "ro.lge.proximity.delay=25" >> /system/build.prop

busybox echo "mot.proximity.delay=25" >> /system/build.prop

sleep 1

echo ""

echo "Adding network speed tweaks to build.prop..."

echo ""

busybox echo "net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960" >> /system/build.prop

busybox echo "net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960" >> /system/build.prop

busybox echo "net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960" >> /system/build.prop

busybox echo "net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960" >> /system/build.prop

busybox echo "net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960" >> /system/build.prop

busybox echo "net.tcp.buffersize.evdo_b=4096,87380,256960,4096,16384,256960" >> /system/build.prop

sleep 1

echo ""

echo "All Done!!!"

echo ""

echo "Exit_Only @ XDA 2013"

exit 0