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Firefox 7.0.1 painfully slow on Mac Lion, Safari really fast so not an internet problem.

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Firefox 7.0.1 extremely slow compared with Safari.

Firefox 7.0.1 extremely slow compared with Safari.

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The default of the pref network.http.max-connections has been increased from 30 to 256 in Firefox 6+ versions.

You can try to decrease the value of the pref network.http.max-connections from 255 to a more modest setting like 30 as used in Firefox 3 versions.

You can also try to disable IPv6.