http://ie.microsoft.com/testdrive/Performance/SpeedReading/Default.html
| Score (less better) | Windows Size | Test Date | |
| IE 9.0.8112.16421CO | 22 seconds | 1858x1024 | 8/21/2011 |
| Firefox 6.0 | 23 seconds | 1858x1016 | 8/21/2011 |
| IE 9.0.8112.16421CO | 40 seconds | 1920x1080 | 1/29/2012 |
| Firefox 9.0.1 | 20 seconds | 1920x1079 | 1/29/2012 |
| Firefox 10.0.1 | 17 seconds | 1920x1062 | 1/29/2012 |
| Firefox 13.0 | 9 seconds | 1920x1062 | 6/6/2012 |
| Safari 15.3 | 6 seconds | 1728x1028 | 2/2/2022 |
| Chrome 98.0 | 6 seconds | 1728x1028 | 2/2/2022 |
Conclusion: IE 9 maybe a little faster, but consider the Firefox more memory footprint saving and cross-platform and so many extension and plug-in. I still prefer Firefox as my primarily browser. (only right at 8/21/2011)