ariya/esprima — pull request #240 by michaelficarra (2014-04-03 17:39:24+00:00)
Title: disable location tracking to make comparison more fair

With location tracking enabled on only the parsers that support it, the results are strongly skewed.

Results with location tracking:

```
Source Esprima UglifyJS2 Traceur Acorn
Underscore 1.5.2 7.8 ±0.5% 13.1 ±7.5% 7.1 ±2.3% 4.5 ±0.9%
Backbone 1.1.0 9.3 ±0.5% 19.5 ±4.4% 8.0 ±2.1% 4.9 ±2.9%
jQuery 1.9.1 51.1 ±4.3% 138.6 ±8.3% 41.9 ±4.7% 28.8 ±7.2%
Total 68.2 ms 171.1 ms 57.0 ms 38.2 ms
```

Results without location tracking:

```
Source Esprima UglifyJS2 Traceur Acorn
Underscore 1.5.2 2.8 ±2.0% 13.6 ±7.5% 6.9 ±1.0% 2.8 ±2.9%
Backbone 1.1.0 2.8 ±0.3% 20.8 ±3.1% 7.7 ±2.1% 3.3 ±1.9%
jQuery 1.9.1 17.4 ±0.2% 138.3 ±7.9% 41.9 ±1.5% 17.0 ±1.3%
Total 23.1 ms 172.8 ms 56.5 ms 23.1 ms
```