[Samsung Galaxy S Duos] _AE_:
These are the build.prop tweaks you can use to make your phone better:

Steps to follow

Just copy these and paste it in your build.prop.

Performance Tweaks, will make your PHONE faster..

# # Performance Tweaks #
# Increase Performance
ro.config.hw_menu_unlockscreen=false
persist.sys.use_dithering=0
persist.sys.purgeable_assets=1
dalvik.vm.dexopt-flags=m=y
ro.mot.eri.losalert.delay=1000
debug.enabletr=true
dev.pm.dyn_samplingrate=1
video.accelerate.hw=1
ro.vold.umsdirtyratio=20
debug.overlayui.enable=1
debug.egl.hw=1
ro.fb.mode=1
hw3d.force=1
persist.sys.ui.hw=1
ro.sf.compbypass.enable=0
debug.sf.hw=1
debug.composition.type=c2d
persist.sys.composition.type=c2d
debug.performance.tuning=1
windowsmgr.max_events_per_sec=150
# Free up more space/Ram when needed
persist.sys.purgeable_assets=1
dalvik.vm.dexopt-flags=m=v,o=y
# RAM Management
ro.config.hw_fast_dormancy=10
# You can use multiwindow for all apps
# Default value is false, edit to true
persist.splitwindow.support_all=true
# Edit OOM value for more free ram
ro.sys.fw.mOomMinFree4=146880
ro.sys.fw.mOomMinFree5=215000
ro.sys.fw.mOomMinFree6=398048
# Enable Permanent LTE Option
# default value is 9
ro.telephony.default_network=12
# Disable all android log
profiler.force_disable_err_rpt=1
profiler.force_disable_ulog=1
logcat.live=disable
ro.kernel.android.checkjni=0
ro.kernel.checkjni=0
ro.config.nocheckin=1
# Wi fi scan interval
wifi.supplicant_scan_interval=143
# 3d Performance
persist.android.strictmode=0
ro.min_pointer_dur=1 ro.secure=0
dalvik.vm.verify-bytecode=false
dalvik.vm.dexopt-flags=v=n,o=v,m=y
# Liquid Smooth Ui
persist.servyce.lgospd.enable=0
persist.service.pcsync.enable=0

System Tweaks

# # System Tweaks #
# Forces home launcher into memory
ro.HOME_APP_ADJ=1
# SD card fix

Disable Boot Animation

# Disable Boot Animation
debug.sf.nobootanimation=1

Quick Boot/Faster Boot

#Faster Boot
ro.config.hw_quickpoweron=true

Make Video and Photo Quality Better and Video Streaming Caster

# # Media Tweaks #
#Makes streaming videos stream faster
media.stagefright.enable-player=true
media.stagefright.enable-meta=true
media.stagefright.enable-scan=true
media.stagefright.enable-http=true
media.stagefright.enable-record=false
# Raise Photo Quality
ro.media.enc.jpeg.quality=100
# Better camera and video taking results camera/camcorder mods
ro.media.capture.maxres=8m
ro.media.capture.fast.fps=4
ro.media.capture.slow.fps=120
ro.media.capture.flashMinV=3300000
ro.media.capture.torchIntensity=40
ro.media.capture.flashIntensity=70
ro.media.panorama.defres=3264x1840
ro.media.panorama.frameres=1280x720
ro.camcorder.videoModes=true
ro.media.dec.jpeg.memcap=12000000
ro.media.enc.hprof.vid.bps=12000000
debug.performance.tuning=1
video.accelerate.hw=1

Save Battery without decreasing Performance

# # Power Saves #
# Deep Sleep
ro.ril.disable.power.collapse=1
pm.sleep_mode=1
# Helps Scrolling Responsiveness
windowsmgr.max_events_per_sec=150
# Increase overal touch
Debug.performance.tuning=1
Video.accelerate.hw=1

Better Signal,Data,Net & Wifi Tweaks

# Better Signal Tweaks ro.ril.hep=1 ro.ril.enable.dtm=0 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
# Net Speed Tweaks net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960 net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960 net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960 net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960 net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960 media.stagefright.enable-meta=true media.stagefright.enable-record=fals
# Use Google DNS
net.ppp0.dns1=8.8.8.8
net.ppp0.dns2=8.8.4.4
net.dns1=8.8.8.8
net.dns2=8.8.4.4
# Wireless 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 18700
wifi.supplicant_scan_interval=180

Tested on Kitkat4.4.4

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