The tips in the how to fix froyo thread in this same forum help fix my phone.

 

i didnt update

i may do the community rom someday, but for now 2.1 is fine and running smooth

 

2nd this. if it's REALLY bad, you can use ODIN and flash back to 2.1 and start over again.

I didn't update my wifes fascinate. She's still on 2.1 and she's absolutely fine with it. I didn't update it cause of the battery drain with 2.2. She doesn't plug in or pay attention to the battery life as much as I do. She also doesn't use flash on her phone (which is the biggest reason for 2.2 IMO). She's perfectly content on 2.1 for now and she can get 2h 19m XXs out of a battery charge and still have about 15% left. I bet she could get 3 days if she let it go down further.