Platform:
- Hardware: IBM ThinkPad T41, Intel Pentium M 1.59 GHz, 512M of RAM
 - OS: MS Windows XP SP2
 
Test:
Browsers:
- MS Internet Explorer 7, RC, version 7.0.5700.6
 - Firefox-Minefield, version 3.0a1, Mozilla 1.9a1, Gecko/2006090404
 - Flock, version 0.7.4.1, Mozilla 1.8.0.5, Gecko/20060731, Firefox/1.5.0.5
 - Opera 9.01
 - Swift 0.1, WebKit for WIN32
 
Results:
- Opera 9 - 668ms
 - Swift 0.1 - 781ms
 - MS IE 7 - 958ms
 - FF 3.0 - 1386ms
 - Flock 0.7 - 2379ms
 
- Tests were made several times for every browser but the average result is about the one above.
 
Resume:
- Opera 9 is a winner.
 - Mozilla 1.8-1.9 is a looser.
 
Browser notes:
- Flock browser is based on Firefox, that based on Mozilla.
 - Every Mozilla based browser info contains also correspondent Mozilla and Gecko versions.
 - Swift is a first WebKit based browser for MS Windows.
 
Update 2006.09.05 16:27:
I’ve made a bug report for Mozilla regarding this issue: Bug # 351406