[Optimus L3, L5, L7 General] f3tus:
Ultimate L3 build.prop?

I've also compared build.prop values set by the following three scripts:

V6 SuperCharger

Project Fluid

Near Project Butter

And threw them all together, hopefully creating the "ultimate" build.prop for L3 (L5 and L7 with JellyBean don't need this):

#Qualcomm specific tweaks. Might cause reboot on other.
com.qc.hardware=true
debug.qc.hardware=true
debug.qctwa.preservebuf=1
debug.qctwa.statusbar=1

#Unlock fps limit
debug.egl.swapinterval=0

#Render UI with GPU and GPU tweaks:
debug.composition.type=gpu
debug.egl.hw=1
debug.sf.hw=1
ro.sf.compbypass.enable=0
#enable harware egl profile
debug.egl.profiler=1
#Enable tile rendering
debug.enabletr=true
persist.sys.composition.type=gpu
#16BIT transparency , Smother Scrolling
persist.sys.use_16bpp_alpha=1
#3d performance
persist.android.strictmode=0
ro.min_pointer_dur=1
ro.secure=0

#Fluid UI
persist.service.lgospd.enable=0
persist.service.pcsync.enable=0

#Device supports EHRPD
ro.config.ehrpd=true

#System prop for tethering denied
ro.tether.denied=false

#Possible screen glitch fix
debug.gr.numframebuffers=3

#Disable boot animation for faster boot
debug.sf.nobootanimation=1

#Disable debugging notify icon on statusbar
persist.adb.notify=0

#Enable Hardware 3D
hw3d.force=1

#Phone will not wake up from hitting the volume rocker
ro.config.hwfeature_wakeupkey=0

#Unlock phone by menu key
ro.config.hw_menu_unlockscreen=false

#Save power while phone is in sleep mode
ro.ril.disable.power.collapse=1

#Ringtone rings without delay
ro.telephony.call_ring.delay=0

#The wifi scan interval in seconds so you can use a lower or higher value.
wifi.supplicant_scan_interval=180

#Better scrolling responsiveness
windowsmgr.max_events_per_sec=90
ro.max.fling_velocity=12000
ro.min.fling_velocity=8000

#Better touchscreen responsiveness
touch.presure.scale=0.001

#Support for ipv4 and ipv6.
persist.telephony.support.ipv4=1
persist.telephony.support.ipv6=1

#Faster boot
persist.sys.shutdown.mode=hibernate
ro.config.hw_quickpoweron=true

#Better battery life
ro.config.hw_fast_dormancy=1
ro.config.hw_power_saving=true

#Enable 16 BIT
debug.fb.rgb565=1

#VM tweak
ro.vold.umsdirtyratio=20

#Disable Zygote loader
ro.wmt.blcr.enable=0

#Better in call voice quality
ro.ril.enable.amr.wideband=1

#Signal Tweaks
persist.cust.tel.eons=1
ro.ril.gprsclass=10
ro.ril.hsdpa.category=8
ro.ril.hsupa.category=6
ro.ril.hsxpa=1

#Wireless Speed Tweaks
net.ipv4.ip_no_pmtu_disc=0
net.ipv4.route.flush=1
net.ipv4.tcp_ecn=0
net.ipv4.tcp_fack=1
net.ipv4.tcp_mem=187000 187000 187000
net.ipv4.tcp_moderate_rcvbuf=1
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_rfc1337=1
net.ipv4.tcp_rmem=4096 39000 187000
net.ipv4.tcp_sack=1
net.ipv4.tcp_timestamps=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_wmem=4096 39000 187000
net.tcp.buffersize.default=4096,87380,256960,4096, 16384,256960
net.tcp.buffersize.edge=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.gprs=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.umts=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,163 84,256960

#Website Bypass
net.dns1=8.8.8.8
net.dns2=8.8.4.4
net.rmnet0.dns1=8.8.8.8
net.rmnet0.dns2=8.8.4.4

#Graphics Enhancement:
#Raise photo and video recording quality
ro.media.enc.hprof.vid.bps=8000000
ro.media.enc.hprof.vid.fps=75
#Raise JPG quality to 100%
ro.media.enc.jpeg.quality=100
ro.media.dec.aud.wma.enabled=1
ro.media.dec.vid.wmv.enabled=1
ro.media.cam.preview.fps=0
ro.media.codec_priority_for_thumb=so

#DalvikVM:
dalvik.gc.type=precise
dalvik.vm.dexopt-data-only=1
#Enables register map for tracking objects to garbage collect. Might give a little more RAM at the cost of a few CPU cycles.
dalvik.vm.dexopt-flags=m=v,o=y
dalvik.vm.jniopts=forcecopy
dalvik.vm.lockprof.threshold=500
dalvik.vm.stack-trace-file=/data/anr/traces.txt
dalvik.vm.verify-bytecode=false

#Unknown functions
debug.kill_allocating_task=0
debug.overlayui.enable=0
dev.pm.dyn_samplingrate=1
ENFORCE_PROCESS_LIMIT=false
persist.sampling_profiler=0
ro.debuggable=1
ro.config.disable.hw_accel=false
ro.fb.mode=1

#Media quality improvements
media.stagefright.enable-player=true
media.stagefright.enable-meta=true
media.stagefright.enable-scan=true
media.stagefright.enable-http=true
media.stagefright.enable-record=true

#Might or might not work:
#debug.performance.tuning=1
#video.accelerate.hw=1
#Enable surface dithering
#persist.sys.use_dithering=1
#ro.sec.proximity.delay=0
#Raise photo and video recording quality
#ro.media.dec.jpeg.memcap=20000000

#Not working:
#persist.sys.ui.hw=1
#dalvik.vm.checkjni=false
#dalvik.vm.execution-mode=int:jit
#Fix some application issues/Disable kernel error logging
#ro.kernel.android.checkjni=0
#ro.kernel.checkjni=0

Just append at the bottom of /system/build.prop under the values set by V6 SuperCharger, save and reboot. Make a backup just in case you get a bootloop and save it as /system/build.prop.orig as well as on your PC. In that case, it's easy to recover with either ADB or a flashable zip. No need for any nandroid backups. But it shouldn't cause a bootloop...

All credits to the original authors.