The biggest issue with snapshot speed is due to low-level driver issues - there's about a 700ms lag when switching from viewfinder to full-res capture. Once we're in full-res, it can be streamed at 10fps just fine (until you run out of memory a few seconds later), but changing resolutions is slow.

Unfortunately, fixing that is quite painful, since we'd either have to backport driver code from the current TI/Nokia development branch of the omap3 camera drivers, which is aimed at much newer kernels (but apparently reduce the lag to around 200ms) or do the coding ourselves, which is a very big job.