> Wikipedia pages tend to get 3x or so improved style recalc time on typical systems with Intel quad core CPUs, for example.
Do you have absolute numbers? If it's 100 vs. 300 ms, that'd be huge. If it's 1 vs. 3 ms, I don't really care.
On my Haswell MBP, Stylo can take first pageload styles on Wikipedia pages from 150-200 ms down to 50 ms or so, last I checked.
It's even better now - we get down to about 14ms with various recent improvements in style sharing.
Yes, most pages have significant speedups during the initial restyle especially. Wikipedia pages tend to get 3x or so improved style recalc time on typical systems with Intel quad core CPUs, for example.
Of course, styling is only one part of the whole, so your overall speedups are limited by the rest of the rendering pipeline. That's Amdahl's Law for you. But that's no reason to not parallelize at all; it just means that we have lots more work to do once this is done :)