It can take more that 2'30'' to render/export just 12 frames as an image sequence (PNG for example). It would be great to have faster rendering times :)
Sorry, but while we're always trying to optimize Krita, it just isn't useful to have bug or wish reports for that. From your other bug reports, I'm beginning to suspect you have a mac with a rotating hard disk -- and there we are just limited by whatever write speed OSX provides. On my mac mini with a rotating hard disk, everything is too slow to be useful. But in any case, this isn't a topic for a wish report.