I have it somewhere, also still have that laptop. It wasn't a benchmark but a poc for an algorithm.

I did some serious optimization when I wrote it. There was a "best practices" for V8 that shedded some light on the background of JS variable allocation, I followed it and got a serious boost. Also did lookup tables instead of runtime math with exp/log functions. But in the end: hit several worst case images that took more than 12s, which was a gap that couldn't further be reduced through optimization.

But you're absolutely right, I should redo it in PNaCl.