[timje1]

https://hacks.mozilla.org/2013/12/monster-madness-creating-g...

This is from a link in the article for more information. These Monster Madness fellows found Firefox gave them 33% of native performance, and Chrome 20%. Presumably IE would give you fractions of these figures.

I figured that, rather than citing figures from benchmarks, I'd go for the real world scenario that this release has given us.

[ZeroGravitas]

Those figures seem to be in the context of a week long initial port. The team lead uses a figure of 50% in the video.