Some numbers on a MacBook Pro 2.53 GHz Core 2 Duo
| commit | Firefox 3.0.15 | Safari 4.0.3 |
| bb5899c56e33716db724cb60a5120b91f5fccdeb | 28 ms/instantiation | 15.02 ms/instantiation |
| 2847c1cf1a2874e9fe56b5749e6e105e37bb086a | 49.27 ms/instantiation | 24.48 ms/instantiation |