Guys,
I *heartily* recommend "top". With that, you can find the culprit much-much easier - as I've did with the 3gs 6.1.3 locationd bug.
Top all day! I recommend that package to everyone including friends. I also provide them with the command to sort by process usage so if there's a runaway process the culprit will be listed first. People always sleep on it especially in times of troubleshooting. I always use that command lol.
Heavily slept on for sure.