1.) Go to: Tools>manage ad-ons>enable or disable ad-ons.
This is where you can disable any "bloat" that's slowing down your browser.
2.) Clean your temporary internet files, cache, ect,...
3.) Make sure you have the most recent release of IE7.
4.) Download Firefox. This might be a good permanent solution, but at the very least it will help you isolate the issue. If Firefox is more responsive than the problem is with IE but if Firefox is also slow then it's a problem with your PC or connection.
I still use ie6, experience same prob. with some sites. Will go to site but will NOT complete display. (It's server is probably out of this world also.) You may be experiencing same/similar prob. There's no particular reason for it but the only solution that I have found that works is to drop off line, delete cookies/files. THEN reconnect. Expanding file cache width was no help. It's an old prob. with MS sw. Would NOT hold my breath for a reliable fix. Thanks for the tip, just another reason NOT to update.