so far ok man. i guess naa gyud ang lag. Its expected actually because of the intermittent animation when switching from one pic to another.
im sure the speed can be tweaked. i'm waiting for instructions how to tweaks this. also in smsing. I'm quite fast with the qwert key and the phone cant seem to keep up. its really the animation thing. maybe because its like flash or what. it the same kind of lag i experience with my SE w910i's walkman 3.0 where the library/player interface is flash-based or flashlike (its almost same concept as the psp menu system but psp is faster).