firefox download freez

problem is that when I try to download something with firefox, the download freezes for a ~10 seconds and then I can see the speed and file size change for a sec. it says that download should take about 3 mins but this has been so for atleast 7 mins now. how do fix that. I freshly installed ff v3.0.10 with greasemoney with rs link checker and rs bundle user script installed. no other addons. this is really annoying…
Answer #1
Keeping the Download History can cause extensive usage of memory and this can slow down or freeze Firefox. 1. Delete the “downloads.rdf” file to clear the download history (c:\documents and settings\..\Application data\Mozilla\Firefox\Profiles\.default\)
2. You need to make a little change to the browser setting. Here’s what you do:
3. Open Firefox browser.
4. From the menu bar, click Tools -> Options
5. Click Privacy tab. Uncheck “Remember what I’ve downloaded” check box.