Let me start off by saying all of the issues I am having are not Pete's problems, but rather Verizon/Google’s and Pete has no control over them. With that said I am experiencing lag/FCs/Redraws with ANY Froyo rom, regardless of the kernel I choose.
My first issue is the browser. If the browser functioned the same as it did in 2.1 and included flash, I would keep Froyo installed even if my other issues existed. The browser for me is very "clunky". I don't know if this has to do with flash or just a newer browser version but It gets laggy at times, is not as responsive and seems generally slower. It’s annoying to use.
My next issue is Pandora. I use my phone in my car and listen to Pandora everyday and with 2.2 it is unbearably low in quality, to the point where I need to just turn it off.
The next issue is application compatibility, which is not really Verizon/Google's fault, but there are several applications that simply FC every time I open them. I am confident however, that the developers will fix these issues.
I tried out many 2.2 Roms and ended up going back to 2.1 (specifically BB 1.1) and it feels like I am back home again. And until these issues get sorted out I will remain with 2.1.
Just to add though that many of the features 2.2 has to offer are really cool and I cannot wait until I can finally use them.