Location Services are the biggest headache interms of battery drain!
Disable as much as possible and set fix parameters where possible.
Just run TomTom or any NAV application for an hour and you'll see what im talking about
Re: LockInfo
It all depend show you use it. If you use it normal which is to get notifications on lockscreen of messages/emails/notifications etc then it isn't using much resources. If you go for the Sunday roast and have everything selected then it will because its being asked to do everything.
I only use LI on my lockscreen and use the "customised" notification center. Thats it!
At the moment, BiteSMS is the biggest hog on my phone. Its very laggy and can be slow. I preferred iRealSMS but that hasn't been updated for iOS5. I wish they would sort it out. BiteSMS also has more MobileSubstrates of any app...it has 3 where otehrs have just one. Now these 3 are running all the time.
Another
MASSIVE hog is
Activator for system gestures. I don't use gestures for much. Only for bringing up SBSettings and CallBar. Minimise usage of this aswell!
Re: Customisation
Minimise usage of WinterBoard as much as possible! You can do a lot just replacing the original iOS files. See my guide.