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Optimizing Firefox 3.5??

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http://forums.opensuse.org – How can I speed this rascal up? Firefox 3.0xx flew compared to 3.5. In particular, the latest version of Firefox essentially "hangs" (i.e., I lose control with the mouse) while it loads a lengthy page. When I play a Flash video and then close that window, my other windows take up to 5 seconds to become responsive again. I know that the "safe browsing" feature costs a little bit as far as performance. But I've been surprised at how much slower 3.5 is. One thing -- I happened to run Wireshark on a browse session tonight and was intrigued to see that Firefox basically did a DNS on everything that I'd browsed in the past few hours. In other words: I opened one session, checked some news and weather, then closed Firefox and did some other things. When I reopened Firefox a while later, it re-did the DNS queries (*with* Google safe browsing checks on each!) on all of the news and weather sites that I'd browsed earlier, even though I hadn't requested them on this new session! Any way to turn that off??? Thanks for any suggestions. (Distributions)