On the ipod classic, at least, I don't find it slow to run. Though that presumably has a stronger CPU than the video?
However, I do find it takes an _eternity_ (well, several hours) to actually prepare the art database to use, and it seems it has to be done again every time you put more content on. Which is why I rarely bother using pictureflow now (nice though it is). This presumably is largely down to how much content I have on there, though. I suppose that might just be unavoidable when pushing such old hardware to its limits. An entirely unrealistic ambition of mine (given poor programming abiltiies) is to try and improve pictureflow (allowing ordering by artist as well as album name would be nice, as well as perhaps making it more efficient somehow).
Actually, that relates to another issue, which is that I've never found 'update database' to work for the video or classic. Always find I have to reinitialise it entirely when I add more content (doing so seems to require recreating the art database as well). Anyone else find that?
(This is all with flash-modded ipods, mind, and again, with quite a lot of content on there)