My phone does the same this. The shutter on my phone has lagged ever since 1.4 upgrade.
I had the 600MHz installed and it lagged
No patch.... lagged
I also have the video flash recording patch thing installed. I don't know if this has anything to do with it, but I kind of doubt it since I haven't had it installed the whole time and it still lagged.
I don't care as long as my phone can still take pictures and record... it's just a sound lol
To see if your phone is really lagging, open the camera app, switch it to picture mode and disable the flash. Press and hold the space bar, Pre will start taking pictures every second. If it does not, you have a problem.