[Samsung Epic 4G Touch] Custodian:
For those that aren't sure of what build.prop tweaks work. Here's my prop dump! Tweaked for Max battery and performance!

# begin build properties

# autogenerated by buildinfo.sh

ro.build.id=IMM76D

ro.build.display.id=IMM76D

ro.build.version.incremental=eng.ameer.20120331.155834

ro.build.version.sdk=15

ro.build.version.codename=REL

ro.build.version.release=4.0.4

ro.build.date=Sat Mar 31 15:59:25 CDT 2012

ro.build.date.utc=1333227565

ro.build.type=userdebug

ro.build.user=ameer

ro.build.host=dipset

ro.build.tags=test-keys

ro.product.model=SPH-D710

ro.product.brand=Samsung

ro.product.name=SPH-D710

ro.product.device=epic4gtouch

ro.product.board=SPH-D710

ro.product.cpu.abi=armeabi-v7a

ro.product.cpu.abi2=armeabi

ro.product.manufacturer=samsung

ro.product.locale.language=en

ro.product.locale.region=US

ro.wifi.channels=

ro.board.platform=exynos4

# ro.build.product is obsolete; use ro.product.device

ro.build.product=epic4gtouch

# Do not try to parse ro.build.description or .fingerprint

ro.build.description=SPH-D710-user 4.0.3 IMM76D FC24 release-keys

ro.build.fingerprint=samsung/SPH-D710/SPH-D710:4.0.3/IML74K/FC24:user/release-keys

ro.build.characteristics=default

ro.cm.device=epic4gtouch

# end build properties

#

# system.prop for epic4gtouch

#

rild.libpath=/system/lib/libsec-ril40.so

rild.libargs=-d /dev/ttyS0

persist.sys.strictmode.visual=0

#

# ADDITIONAL_BUILD_PROPERTIES

#

ro.rommanager.developerid=cyanogenmod

keyguard.no_require_sim=true

ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html

ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html

ro.com.google.clientidbase=android-google

ro.com.android.wifi-watchlist=GoogleGuest

ro.setupwizard.enterprise_mode=1

ro.com.android.dateformat=MM-dd-yyyy

ro.com.android.dataroaming=false

ro.cm.version=9-20120331-SNAPSHOT-epic4gtouch-alpha2

ro.modversion=9-20120331-SNAPSHOT-epic4gtouch-alpha2

ro.config.ringtone=CyanTone.ogg

ro.config.notification_sound=CyanMessage.ogg

ro.config.alarm_alert=CyanAlarm.ogg

wifi.interface=wlan0

ro.telephony.default_network=4

ro.cdma.home.operator.numeric=310120

ro.cdma.home.operator.alpha=Sprint

net.cdma.pppd.authtype=require-pap

net.cdma.pppd.user=user[SPACE]SprintNextel

net.cdma.datalinkinterface=/dev/ttyCDMA0

net.interfaces.defaultroute=cdma

ro.telephony.ril_class=SamsungRIL

ro.ril.samsung_cdma=true

ro.carrier=Sprint

ro.wimax.interface=uwbr0

ro.cdma.ppp.interface=ppp0

net.tcp.buffersize.wimax=4096,524288,1048576,4096,16384,110208

mobiledata.interfaces=ppp0,uwbr0

ro.opengles.version=131072

hwui.render_dirty_regions=false

ro.sf.lcd_density=240

ro.vold.switchablepair=/mnt/sdcard,/mnt/emmc

dalvik.vm.heapstartsize=5m

dalvik.vm.heapgrowthlimit=48m

dalvik.vm.heapsize=256m

dalvik.vm.lockprof.threshold=500

net.bt.name=Android

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

# SuperCharger Installation Marker.

# V6 SuperCharger, OOM Grouping & Priority Fixes created by zeppelinrox.

# SuperMinFree Calculator & MFK Calculator (for min_free_kbytes) created by zeppelinrox also ;^]

#

# See http://goo.gl/krtf9 - Linux Memory Consumption - Nice article!

# See http://goo.gl/hFdNO - Memory and SuperCharging Overview ...or... "Why `Free RAM` Is NOT Wasted RAM!"

# See http://goo.gl/4w0ba - MFK Calculator Info - explanation for vm.min_free_kbytes.

#

# DO NOT DELETE COMMENTS. DELETING COMMENTS WILL BREAK UNINSTALL ROUTINE!

#

# BEGIN OOM_MEM_Settings

# END OOM_MEM_Settings

# BEGIN OOM_ADJ_Settings

# END OOM_ADJ_Settings

# Miscellaneous Tweaks!

persist.sys.purgeable_assets=1

wifi.supplicant_scan_interval=180

windowsmgr.max_events_per_sec=200

pm.sleep_mode=1

# 3G TurboCharger Enhancment!

net.dns1=8.8.8.8

net.dns2=8.8.4.4

net.tcp.buffersize.default=6144,87380,110208,6144,16384,110208

net.tcp.buffersize.wifi=262144,524288,1048576,262144,524288,1048576

net.tcp.buffersize.lte=262144,524288,1048576,262144,524288,1048576

net.tcp.buffersize.hsdpa=6144,262144,1048576,6144,262144,1048576

net.tcp.buffersize.evdo_b=6144,262144,1048576,6144,262144,1048576

net.tcp.buffersize.umts=6144,87380,110208,6144,16384,110208

net.tcp.buffersize.hspa=6144,87380,262144,6144,16384,262144

net.tcp.buffersize.gprs=6144,8760,11680,6144,8760,11680

net.tcp.buffersize.edge=6144,26280,35040,6144,16384,35040

# End of V6 SuperCharged Entries.

#Allow Touchpad to sleep better

ro.ril.disable.power.collapse=0

#Disable error checking

ro.kernel.android.checkjni=0

#Media Streaming Speed 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=false

#Wifi Speed Improvements

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

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

net.ipv4.tcp_ecn=0

net.ipv4.route.flush=1

net.ipv4.tcp_rfc1337=1

net.ipv4.ip_no_pmtu_disc=0

net.ipv4.tcp_sack=1

net.ipv4.tcp_fack=1

net.ipv4.tcp_window_scaling=1

net.ipv4.tcp_timestamps=1

net.ipv4.tcp_rmem=4096 39000 187000

net.ipv4.tcp_wmem=4096 39000 187000

net.ipv4.tcp_mem=187000 187000 187000

net.ipv4.tcp_no_metrics_save=1

net.ipv4.tcp_moderate_rcvbuf=1

#Saves power when the phone is sleeping

pm.sleep_mode=1

#Increase overall touch responsiveness

debug.performance.tuning=1

video.accelerate.hw=1

persist.sys.purgeable_assets=1

#Increases quality of photo and videos

ro.media.dec.jpeg.memcap=8000000

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

#Increases JPEG quality to 100 percent

ro.media.enc.jpeg.quality=100

#vm tweak

dalvik.vm.verify-bytecode=false

dalvik.vm.dexopt-flags=v=n,o=v

# Nitro Lag Nullifier created by zeppelinrox.

#

# DO NOT DELETE COMMENTS. DELETING COMMENTS WILL BREAK UNINSTALL ROUTINE!

#

ENFORCE_PROCESS_LIMIT=false

MAX_SERVICE_INACTIVITY=

MIN_HIDDEN_APPS=

MAX_HIDDEN_APPS=

CONTENT_APP_IDLE_OFFSET=

EMPTY_APP_IDLE_OFFSET=

MAX_ACTIVITIES=

ACTIVITY_INACTIVE_RESET_TIME=

# End of Nullified Entries.

Sent from my SPH-D710