Firefox 4 very slow to load

Please can you tell me how to revert back to the previous version 3. All I read about is that so many users are having speed issues with the new version. I don't want to sit for hours trying this and that, turning plug-ins off etc.. I just now want to go back to a version which was the best on the market. Thanks.

Create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile.
* http://kb.mozillazine.org/Testing_pre-release_versions
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

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