Computer/Golf Geek to the rescue!!! :^) Ok, here are my tips to improve WGT performance on your computer.
1. Try not to run any other programs while playing WGT through IE or Firefox. This includes running multiple browsing tabs.
2. Download the latest version of IE (www.microsoft.com/windows/Internet-explorer/default.aspx) or Firefox (www.mozilla.com/firefox/)
3. Download The latest version of Flash (http://www.adobe.com/products/flashplayer/)
4. If you leave your computer running all the time like I do, try restarting your computer prior to play.
5. Try power cycling your broadband modem. Do this by unplugging the modem, wait 60 seconds and then plug it back in.
6. Run a virus scan. Sometimes viruses and spyware run in the background and kill your internet speed. For a free, good virus scanner go to http://free.avg.com/
If these don't help then I'm sorry to say that it may be time to buy a new, more powerful computer. I hope these tips help. Good luck all!