~JSSVGLength() is slow (or we're creating too many JSSVGLength objects) This might just be bug 14150 again. But Space Invaders plays poorly because we spend soo much time in the collector, or actually in ~JSSVGLength() called from the collector.
Created attachment 16564 [details] sample showing the slowness
This may be "fixed" now that bug 14150 is resolved. Unsure.
I believe this is fixed now what bug 14150 is resolved.