Nah. One piece of rendering I particularly care about is interactive SVG performance, and -- while, as another thread says, we can't expect smooth 60 FPS experiences from current desktop browsers -- the difference between Chrome and Firefox is the difference between 15 FPS and 1 FPS.
Recently all toolbar icons in Firefox have been converted to SVGs [1] and in the process several performance problems were found and fixed or are in the process of being fixed [2]. You may want to try out a recent Nightly build.
