It's *much* slower than xmlpresenter when switching slides. I can move at many slides-per-second with xmlpresenter and it takes 1-2 seconds to switch slides with S5. However, I'm not sure 'slides-per-second' is even a meaningful metric worth considering. Who does multiples slides in a second anyway? Still, I'm concerned for the overall speed of the software if switching slides takes a while.
my vim presentation in s5: presentations/s5/vim.html