I use Windows 8 and IE10. No problems with me, but YMMV. Couple of things that you may try:
- Sign in when you log in (actually, just don't log out, and next time you open the airforums in your browser, you'll be logged in).
- Be careful of your add-ons (tools/ manage add-ons). Look at the "enabled" add-ons. You can pick up some unhelpful (and sometimes unhealthy) add-ons with some downloads.
IE has gotten a bad rap over the past decade, and deservedly so. They have cleaned up their act, but have managed to create a very dissatisfied group of ex-users. FF and Chrome are both competent browsers too, but I support the local guys in Seattle.
I believe Windows, or versions of windows, will have little or nothing to do with performance of browser. Windows 7 and 8 are both solid OS.