Yeah one more try I guess, this has irritated me for months now, threads on here and Apple forums always fall on deaf ears.. Long story short, using System Activity Monitor on my iPhone 3GS, as long as I've not used the camera since restarting it, the cpu usage is somewhere around 94 to 97 idle doing nothing. However, using the camera app, taking photos etc, the idle cpu usage will now be stuck somewhere around 80-90, even after closing the camera app in the "multi-task" bar. Might not seem a lot to most people, 5-10% extra idle usage? Well, yeah, it causes the battery to drain quicker doing nothing at all, makes menus feel a little laggier, can cause buggy "usage" stats (standby+usage are the same, like 15 hours or something). This bug has occurred ever since the first iOS4 build, and still present now, restarting the device remedies it (until the camera is used again), restoring from new doesn't fix it, it also explains how iPhones feel "snappier" when restarted. It probably occurs on the iPhone 4, but not as noticeable since the device is slightly faster, anyone experienced this? Or am I condemned to never use my iPhone camera? Anyone else with a cpu monitor can do some tests? I'd try a swap at Apple store, but my 3GS gets 8-9 hours usage normally, and has a good colour screen... so that's not an option really. tl;dr - Using the camera causes excessive idle cpu usage, draining battery faster and causing slowness until the device is restarted.