It sucks badly. I have the Captivate. Freezes, crashes and lag. GPS barely works. They say the Froyo 2.2 update will fix a lot of the problems but I am totally frustrated with my Samsung Captivate...
Interesting, my parents both have the Captivate and have none of the issues you describe. You may want to look into a warranty claim on that device.
I just picked up a G2 to replace my old G1 and stock Froyo is fantastic!
Interesting. I’ve found the GPS on the Captivate to be very buggy. It doesn’t seem to lock in properly. I’d be driving along the same stretch of parkway for 15 miles and it would think I had exited and tell me to make turns on local road.
However, my Captivate almost never freezes, crashes or lags. Both the screen scrolling and internet browsing has been very fast in my experience.
Do you have a task killer app (like Advanced Task Killer)? It makes it easy to close all the AT&T bloatware and other programs running in the background, which could slow down your phone. If you don’t you can get it for free in the Android Market.