Every testcase counts time of tokenizing via esprima.tokenize()

As of today results

lushnikov:~/prog/esprima/test(master)$ node benchmarks
Doesn't have exposed gc().
    Underscore 1.5.2    42.5 KiB      3.77 ms ± 2.60%
      Backbone 1.1.0    58.7 KiB      4.74 ms ± 0.63%
      MooTools 1.4.5   156.7 KiB     45.74 ms ± 2.32%
        jQuery 1.9.1   262.1 KiB     58.39 ms ± 7.26%
          YUI 3.12.0   330.4 KiB     49.95 ms ± 1.27%
 jQuery.Mobile 1.4.2   442.2 KiB     95.95 ms ± 7.95%
       Angular 1.2.5   701.7 KiB     79.69 ms ± 6.74%
               inbox  1945.5 KiB   1749.02 ms ± 0.29%
                     ------------------------
                      3939.8 KiB   2087.26 ms ± 2.52%

SAX interface

lushnikov:~/prog/esprima/test(sax)$ node benchmarks.js
Doesn't have exposed gc().
    Underscore 1.5.2    42.5 KiB      6.14 ms ± 0.79%
      Backbone 1.1.0    58.7 KiB      6.90 ms ± 0.82%
      MooTools 1.4.5   156.7 KiB     30.32 ms ± 1.18%
        jQuery 1.9.1   262.1 KiB     44.62 ms ± 1.37%
          YUI 3.12.0   330.4 KiB     34.16 ms ± 0.59%
 jQuery.Mobile 1.4.2   442.2 KiB     73.66 ms ± 1.12%
       Angular 1.2.5   701.7 KiB     55.50 ms ± 0.53%
               inbox  1945.5 KiB    851.61 ms ± 0.80%
                     ------------------------
                      3939.8 KiB   1102.92 ms ± 0.85%

SUMMARY

How much times SAX is faster then current tip-of-tree?

    Underscore 1.5.2    42.5 KiB      0.61
      Backbone 1.1.0    58.7 KiB      0.68
      MooTools 1.4.5   156.7 KiB      1.50
        jQuery 1.9.1   262.1 KiB      1.30
          YUI 3.12.0   330.4 KiB      1.46
 jQuery.Mobile 1.4.2   442.2 KiB      1.30
       Angular 1.2.5   701.7 KiB      1.43
               inbox  1945.5 KiB      2.05
                     ------------------------
                      3939.8 KiB      1.89