Issue #2: "Personally I have found the Peacekeeper results to be a reliable measurement of web browsers performance." Is there data to back up this claim?
* It accidentally benchmarks setTimeout clamping. https://bugzilla.mozilla.org/show_bug.cgi?id=610077 is a dependency of peacekeeper. https://bugzilla.mozilla.org/show_bug.cgi?id=608648 is an example in which setTimeout clamping affects the score a lot.
* Its benchmark of array.splice() is extremely strange: https://bugzilla.mozilla.org/show_bug.cgi?id=592786
* Its layout benchmarks do not really stress layout and instead either stress basic painting operations or DOM accessors. Most pages do not sit there calling style.top in a loop over and over.
* It sets MozTransform only in Firefox without setting values in Chrome: https://bugzilla.mozilla.org/show_bug.cgi?id=920659
And so on.
There is no reason to think that Peacekeeper's JS benchmarks are particularly better than V8's; in fact, they're probably worse, due to the proliferation of microbenchmarks. You'd get about the same effect by going to jsperf.com and clicking around.