I havnt really noticed the phone itself running slowly, just downloads it seems. to download an application stock, it was a few seconds usually.. now its downloading in 1% increments, sometimes 2%, and i have full bars and 3g..
I am using #2 Overclocked Undervolted 1.15ghz 25mv Overvolt v1.0 right now. It's only day 1 with it, but it hasn't given me any problems yet. I tried #1, but I couldn't not get a signal at all for data after I loaded it.
1392 score using Quadrant Standard
37.729 MFLOPS/Time 2.22 Secs/Norm Res 5.68 using Linpack
Capped at 58fps using Gears for Android
1585 kbps DL / 667 kbps UL using Speedtest (I'm out in the boonies at work)
For what it's worth I have noticed no difference between 1.x, 2.05 and 2.15 beside a working camcorder when going from the 1.x band on Froyo. Then between 2.05 and 2.15 I got some additional option in the camcorder for encoding.
As far as network speeds I'm running about the same. Well within that 20% fluctuation I normally see from test to test.
1250 Quadrant
37 Linpack
1200-1300 kbps DL / 200-300 kbps UL