nice and clean!
I am seeing different behaviors with the browsers. Ie10 there are no 'click' or mouseover actions occurring.
Chrome seems to 'skip' a beat with some of the circlular rotations occuring on its own.
Love the concept and the crisp graphics.
what if you did the "transforms" in illustrator - and then exported that svg or png for that matter, both produce a file of approxiately the same k.
i did a quick test, displays fine in ie9 http://salesdigital.com/bendsvg/
i also noticed the mouseover on the features button is fiddly. are you using a transparent hit zone?
i think a few small replacements would make this shine across the board.
for the text transformations this could be the case (the bend effect is already done in illustrator)
only the rotation effect isn't --> this could be an improvement on my part
but the grey button background is the same file rotated 5 times (1/5th of the filesize)
i first tried to do those circlesegments with css box-radius and clip and transform: rotate --> but the mouse hit test doesn't take the css clip-property in account.
the mouse over is done on the svg grey circlesegment. but because the hover effect makes the segment transparent i had to add a css segment behind it so you wouldn't see the hidden content behind those buttons.
The combination of svg text with behind it an animated semi transparent svg with behind that a css generated circlesegment is indeed pretty heavy to render.
most of these problems are fixable but would probably increase filesize.