In terms of responsiveness I think its even better. In my case using os2007he with skype and browser at the same time is impossible or even only browser and something else is a quite slow process. Using debian I rarely can see bugs or segfaults and running lots of stuff at the same time is not a problem. Quite well.
I really should make the image available but I still can't figure out how the users will put it on the device just because it requires 1GB card and the uploading from the nokia to the pc is a very time consuming process too.