Comparative Performance of Underscore.js in Chrome and IE

I came across the very handy-looking Undersore.js today, and clicked on the test & benchmark link. I first ran the test in Chrome.  The results below show number of operations per second.  Looks like each, map, keys, values, and range are pretty inexpensive operations, whereas uniq and intersect should be used sparingly.  All makes sense. 

Then out of curiosity, I ran the same tests in IE and Firefox.  The exact numbers are not significant as the results vary by 10-20% between subsequent runs in the same browser, but the range is pretty illustrative.  And yes, I know IE9 is harder, better, faster, stronger, so this is not a fair fight.  I can’t wait for IE9 to replace every previous IE version…

	Ops/sec	(higher is	better)
Test	Chrome 6	IE 8	Firefox 3.6
_.each()	20213	510	3249
_(list).each()	13570	493	3161
jQuery.each()	3637	209	910
_.map()	18581	303	5488
jQuery.map()	7084	686	8519
_.pluck()	10852	282	4785
_.uniq()	127	1	33
_.uniq() (sorted)	308	210	84
_.sortBy()	1641	45	359
_.isEqual()	4962	869	1826
_.keys()	22675	1142	4295
_.values()	24551	321	5435
_.intersect()	83	1	20
_.range()	33345	1223	5262

Again, why I use Chrome as my default browser.