[Galaxy S II General] aitkja:
If you are wanting to solve the

lock screen freeze

issue have a look at post #32 in this thread.

The following solution below will ONLY increase battery life:

All you need to do is install Titanium Backup and freeze as many of the following apps as you don't need. I have frozen them all and the device is working very smoothly.

Application monitor 1.1.0 (com.sec.android.widgetapp.programmonitorwidget)

Automation Test 1.0 (com.sec.android.app.DataCreate)

BluetoothTest 1.0 (com.sec.android.app.bluetoothtest)

ChatON 1.11.2 (com.sec.chaton)

ChocoEUKor 1.0 (com.monotype.android.font.chococooky)

Clock (digital) 1.0 (com.sec.android.widgetapp.digitalclock)

Clock (funky) 1.0 (com.sec.android.widgetapp.analogclockunique)

Clock (modern) 1.0 (com.sec.android.widgetapp.analogclocksimple)

com.sec.android.app.lcdtest 1.0 (com.sec.android.app.lcdtest)

CoolEUKor 1.0 (com.monotype.android.font.cooljazz)

Days 1.0 (com.sec.android.widgetapp.days)

DSMForwarding 4.1.2-I9100XXLSJ (com.sec.dsm.phone)

DSMLawmo 4.1.2-I9100XXLSJ (com.sec.dsm.system)

Dual Clock (analogue) 1.0 (com.sec.android.widgetapp.dualclockanalog)

Dual Clock (digital) 1.0 (com.sec.android.widgetapp.dualclockdigital)

Email 4.0 (com.android.email)

Enterprise SysScope Service 4.1.2-I9100XXLSJ (com.android.server.device.enterprise)

Enterprise VPN Services 4.1.2-I9100XXLSJ (com.android.server.vpn.enterprise)

EnterprisePermissions 1.0 (com.sec.enterprise.permissions)

Exchange services 4.1 (com.android.exchange)

Face Unlock 4.1.2-509230 (com.android.facelock)

Factory Test 1.0 (com.sec.android.app.factorytest)

Favorite Apps 1.0 (com.sec.android.favoriteappwidget)

Favorite Contacts 1.1 (com.sec.android.widgetapp.favoriteswidget)

Game Hub 2.0 (com.ngmoco.gamehubmobage)

Group Cast 1.5.40 (com.samsung.groupcast)

Help 1.0 (com.samsung.helphub)

Kies via Wi-Fi 2.0.0 (com.sec.android.app.kieswifi)

Kobo 2.7.940 (com.kobobooks.samsung.android)

MAPServiceSamsung 4.1.2-I9100XXLSJ (com.samsung.map)

Memo 1.0 (com.sec.android.app.memo)

Memo 1.0 (com.sec.android.widgetapp.memo)

Microbes 4.1.2-I9100XXLSJ (com.samsung.android.livewallpaper.microbesgl)

Mini Diary 1.0.5.20121102 (com.sec.android.app.minidiary)

Mobile print 1.6.1.0803 (com.sec.android.app.mobileprint)

Mobile tracker 1.0 (com.android.settings.mt)

My Files 1.0.0 (com.sec.android.app.myfiles)

News Daemon(EUR) 121023.01 (com.sec.android.daemonapp.ap.yahoonews)

Ocean weather 1.0 (com.sec.ccl.csp.app.secretwallpaper.themeone)

PressReader 4.1.1102 (com.newspaperdirect.pressreader.android.samsung)

Readers Hub 12.09.13.1 (com.sec.android.app.readershub)

RoseEUKor 1.0 (com.monotype.android.font.rosemary)

S Planner 4.1.2-I9100XXLSJ (com.android.calendar)

S Planner widget 1.0 (com.sec.android.widgetapp.SPlannerAppWidget)

Samsung Apps 2.8.036 (com.sec.android.app.samsungapps)

Samsung Backup Provider 1.2 (com.sec.android.sCloudBackupProvider)

Samsung Browser SyncAdapter 1.0 (com.sec.android.sCloudSyncBrowser)

Samsung Calendar SyncAdapter 1.0 (com.sec.android.sCloudSyncCalendar)

Samsung Cloud Data Relay 1.4.12r1 (com.sec.android.sCloudRelayData)

Samsung Contact SyncAdapter 1.0 (com.sec.android.sCloudSyncContacts)

Samsung keyboard 1.0 (com.sec.android.inputmethod)

Samsung Push Service 1.1.2 (com.sec.spp.push)

Samsung Syncadapters 2.2.5 (com.sec.android.sCloudSync)

Samsung TTS (com.samsung.SMT)

SamsungAppsUNA2 2.0.35 (com.sec.android.app.samsungapps.una2)

SASlideShow 1.0 (com.sec.android.saslideshow)

Self Test Mode 1.0 (com.sec.android.app.selftestmode)

Simple alarm clock 1.0 (com.sec.android.widgetapp.alarmclock)

SNS 1.1.0 (com.sec.android.app.sns3)

Software update v2.2.9 (com.sec.android.fotaclient)

Software update v5_1210_5_2 (com.wssyncmldm)

Stock Daemon(EUR) 121105.01 (com.sec.android.daemonapp.ap.yahoostock.stockclock)

Swype 1.3.3.9783 (com.nuance.swype.input)

SysScope 1.1.15 (com.sec.android.app.sysscope)

T-Mobile 4.1.2-I9100XXLSJ (com.android.stk)

Talk 4.1.2-509230 (com.google.android.talk)

TalkBack 3.1.1_r68 (com.google.android.marvin.talkback)

TouchWiz home 4.1.2-I9100XXLSJ (com.sec.android.app.launcher)

Trim 34.6.ms_hw (com.lifevibes.trimapp)

Try panning 1.0 (com.sec.android.motions.settings.panningtutorial)

TvOut 1.0 (com.teamhacksung.tvout)

Voice command 2.8.5 (com.vlingo.client.samsung)

Voice Recorder 0.1 (com.sec.android.app.voicerecorder)

Wi-Fi Direct 1.0 (com.sec.android.app.FileShareClient)

Wi-Fi Direct share 1.0 (com.sec.android.app.FileShareServer)

Windy weather 1.0 (com.sec.ccl.csp.app.secretwallpaper.themetwo)

WlanTest 1.0.0 (com.sec.android.app.wlantest)

wssyncmlnps 2.0.0 (com.wssnps)

Yahoo! Finance 121102.01 (com.sec.android.widgetapp.ap.yahoostock.stockclock)

Yahoo! News 12.11.01.01 (com.sec.android.widgetapp.ap.yahoonews)

Zinio 1.23.6131 (com.zinio.samsung.android)

And thats it... No more Lock screen lagging when trying to unlock your phone.

Also I would recommend downloading widget locker and using that as your lock screen it works amazingly smoothly and has tons of customization.