As for my testing. here's what I've had.
battery = same battery life with 2.1 eclair
boot = faster than eclair 2.1
opening apps = slower than 2.1
touch calibration = out of shape. (tried out all my calibration files from my backups but still the same. it seems to be a keyboard problem)
accelerometer = faster than 2.1 (a bit)
gps = seems to be ok
3g = seems to be ok
sound = doesn't seem to have sound yet. I've tried to open first my music files. but since the sd can't be found, the default sound is silent/mute. so there should be no sound. hoping there would be as soon as the sd problem be solved.
storage card(SD) = is not mounted. seems to be ok from the explorer/file browsers i have since i can browse. even installed an app but seems to have no effect afterwards.
wifi = great. it seems to have a faster scanning than the eclair. but It can't seem to connect to my linksys access point. maybe theres a problem in my access point. i'll try some other routers tomorrow and see how this goes.
sleep = this is okay for me as it is the same in the 2.1 eclair. so no biggy here
sliding seems to be laggy than the 2.1 eclair. I hope my testing seems to help. If i forget something i'll post it soon. i'll drop a message if i find out something. as for this is only an alpha build.
overall performance is nice. but not perfect.
hope to have more builds soon as so we can kill winmo. hehehehe
Thanks Babi and to other people in this project.