Let's not forget HTML Slidy < http://www.w3.org/2005/03/slideshow.html >, an older presentation framework with the added benefits of back/forward navigation and incremental build-out.
Slippy does support back/forward nav, but it indeed builds all slides at once. Which allows for the overview feature also (press TAB). I didn't test it with 200-slides decks honestly, so maybe that would cause performance issues in that case. But so far in Chrome it has proven to be very smooth.