Mozilla extremely slow in webmail on OSX


I've been using Mozilla for a while now as my main browser in OSX linux and windows. In the last few releases on OSX (it's fine in the xwindows version I got through fink, and on windows and linux) webmail loads extremely slowly. Most of the page will load and then it will just sit for a few minutes before displaying the full page. This happens every once in a while on other pages but they're not as noticable. Does anyone have any idea what this could be?