[HD2 Android NAND Development] gecata:
I spent some time for build.prop tweaking. Here is it. The sections are self documented, but if You want I can explain more. All these settings/tweaks are rom and Android version independent.

#Render UI with GPU

debug.sf.hw=1

#debug.composition.type=gpu

debug.composition.type=c2d

debug.performance.tuning=1

debug.enabletr=true

debug.qctwa.preservebuf=1

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.composition.type=c2d

persist.sys.ui.hw=1

ro.sf.compbypass.enable=0

ro.sf.lcd_density=240

debug.fb.rgb565=0

# Improve overall media quality

ro.media.enc.jpeg.quality=100

ro.media.dec.jpeg.memcap=8000000

ro.media.enc.hprof.vid.bps=8000000

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

# This is a high density device with more memory, so larger vm heaps for it.

# and some dalvik speedups

dalvik.vm.heapsize=40m

# Get more RAM and faster responses by disabling verify-bytecode

#dalvik.vm.dexopt-flags=v=n,o=v,m=y

dalvik.vm.dexopt-flags=m=y,o=v,u=y

dalvik.vm.verify-bytecode=false

dalvik.vm.dexopt-data-only=1

dalvik.vm.checkjni=0

dalvik.vm.checkjni=false

dalvik.vm.check-dex-sum=false

dalvik.vm.jniopts=warnonly

# gecata test

dalvik.vm.check-dex-sum=false

# gecata test

dalvik.vm.jmiopts=forcecopy

# Turn on Just In Time in dalvik virtual machine

dalvik.vm.execution-mode=int:jit

dalvik.vm.lockprof.threshold=500

dalvik.vm.stack-trace-file=/data/anr/traces.txt

# For the default value of agps

ro.ril.def.agps.mode=2

ro.ril.def.agps.feature=1

# For HSDPA low throughput

ro.ril.disable.power.collapse=1

# For sensor sleep control

ro.ril.sensor.sleep.control=1

ro.wifi.hotspotUI=1

ro.tether.denied=false

# enable/disable data in roaming

#ro.com.android.dataroaming=true

ro.com.android.dataroaming=false

# For quick boot mode

# persist.sys.shutdown.mode=hibernate

ro.config.hw_quickpoweron=true

# Hide debuging icon from taskbar

persist.adb.notify=0

persist.service.adb.enable=1

# Enable egl profiler - enable harware egl profile

debug.egl.profiler=1

#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-aac=true

media.stagefright.enable-qcp=true

media.stagefright.enable-record=true

# Decrease time for screen off/on durrign call

ro.lge.proximity.delay=25

mot.proximity.delay=25

ro.mot.buttonlight.timeout=0

# Decrease dial out delay

ro.telephony.call_ring.delay=0

ring.delay=0

# Disable WiFi calling for EU models

ro.ril.enable.ganlite=0

#Noise Cancellation Off

htc.audio.alt.enable=0

htc.audio.hac.enable=0

### Kernel Tweaks

# Disable error checking (Should speed things up a bit)

ro.kernel.checkjni=0

ro.kernel.android.checkjni=0

### Allow purging of assets (System can free more Ram when needed) ###

persist.sys.purgeable_assets=1

# Disable strict mode checking

persist.android.strictmode=0

# Disable the zygote loader

ro.wmt.blcr.enable=0

# Keep launcher in memory

ro.HOME_APP_ADJ=1

# Won't let memory managers to kill Launcher

ro.PERCEPTIBLE_APP_ADJ=2

#ro.HOME_APP_MEM=2048

# Tweaks for battery saving

pm.sleep_mode=1

usb_wakeup=enable

proximity_incall=enable

power_supply.wakeup=enable

ro.config.hw_power_saving=1

ro.config.hw_fast_dormancy=1

ro.config.hw_quickpoweron=true

persist.sys.use_dithering=0

#improve battery under no signal -- need test

ro.mot.eri.losalert.delay=1000

# For sensor sleep control

ro.ril.sensor.sleep.control=1

# Qualcomm display settings -- Video acceleration and HW degugging

debug.qctwa.statusbar=1

debug.qctwa.preservebuf=1

debug.qc.hardware=true

com.qc.hardware=true

#Bravia Engine Service

ro.service.swiqi.supported=true

persist.service.swiqi.enable=1

# Xloud Engine

ro.semc.sound_effects_enabled=true

ro.semc.xloud.supported=true

persist.service.xloud.enable=1

media.xloud.enable=1

media.xloud.supported=true

# More precisely incall volume control

ro.config.vc_call_vol_steps=15

# Increase overall scrool speed and enable rotation to 270 degree

windowsmgr.max_events_per_sec=170

windowsmgr.support_rotation_270=true

# Faster Scrolling

ro.max.fling_velocity=12000

ro.min.fling_velocity=8000

### Disable Logers (safe battery + performance gain)

### Disable checkin services, error reporting and logging

ro.config.htc.nocheckin=1

ro.config.nocheckin=1

profiler.force_disable_ulog=1

profiler.force_disable_err_rpt=1

### Touch tunning ###

touch.presure.scale=0.001

#ro.min_pointer_dur=

ro.product.multi_touch_enabled=true

ro.product.max_num_touch=2

# Better signal reception

persist.cust.tel.eons=1

ro.config.hw_fast_dormancy=1

# Modify MTU from 1500 to 1472 on 3G network for speeding up

ro.ril.set.mtu1472=1

#

# system props for the data modules

#

ro.use_data_netmgrd=true

persist.data_netmgrd_nint=8

persist.data_netmgrd_mtu=1482

#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

net.tcp.buffersize.hspda=4096,87380,256960,4096,16384,256960

net.tcp.buffersize.hspa=4096,87380,256960,4096,16384,256960

# Google DNS Tweak -- fastest dns

net.rmnet0.dns1=8.8.8.8

net.rmnet0.dns2=8.8.4.4

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