i was curious to know what sbsettings shows for free memory on a jb 3gs for you guys?
mine fluctuates between 165-140 after leaving it on for a few days.
I'm not backgrounding anything, but I'll average right around 120 to 130. Everything pops up pretty quick still, and the only time I ever see any problems is when I start trying to rapid fire change between applications. Then it won't be a smooth opening animation anymore, but it still opens quickly.
Mine's usually about 129 if I don't have any apps Backgrounded. Right now with Safari, Phone and Email running, MS and Winterboard and a few extensions running I'm hovering around 140. The longer Safari runs, though, the more memory it seems to take. Must be some kind of slow leak in it (why in hell won't it just close on exit?).
I run apps Backgrounded all the time. It has no noticeable effect on GUI performance. I also have never had an application close due to memory shortage, even when backgrounding streaming audio for long periods of time and using other apps. I don't think my phone has ever crashed. My current uptime according to SysInfoPlus is just twenty minutes shy of five days. And that reboot was only because I upgraded MobileSubstrate. In my opinion, the 3GS is everything your 2G should have been.
lord Patton: I didn't mean to diss your phone. I just got a little carried away in my enthusiasm for the jailbreakability of the 3GS. I hope your 2G will forgive me.