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* The number of test iterations that are run. Currently each test is run, at least, 5 times - it's been requested that this be increased.
* The calculation of error ranges. Currently the data is fit to a t-distribution, it's been requested that it use a two-variable t-test.
* The quality of the tests. Currently the tests shown are a subset of the tests presented by [http://webkit.org/perf/sunspider-0.9/sunspider.html SunSpider]. There is no particular choice for these tests, other than that they were ones that originated from the original [http://ejohn.org/projects/javascript-engine-speeds/ JavaScript Engine Speeds] compilation. The corpus will likely expand to include all of the SunSpider tests, plus some. Additionally, the use of closures to encapsulate tests is contested and will probably be revised.
All of these points are currently being worked upon - as a unified JavaScript performance analysis platform is a desired goal by all browser vendors.
