Hi - there seem to be a number of different "slowness" issues. Here are some suggestions for the most common types: * Frequent "Problem loading page" issues are likely caused by a firewall. See [[Cannot connect after upgrading Firefox]] for instructions on how to check firewalls. Antivirus toolbars are another possibility to check; see [[Troubleshooting extensions and themes]] * Slow when loading Flash/Java: These issues are usually caused by add-ons or by outdated plugins. First, upgrade all outdated plugins by checking [http://www.mozilla.com/plugincheck/]. If it's still slow, see [[Troubleshooting extensions and themes]] * Slow to start up: This is most often caused by an extension delaying Firefox's startup. See [[Troubleshooting extensions and themes]]. Reply back to this thread if these suggestions don't help. If you have details about exactly when it's slow, it would really help to have more details. (Which websites, how often, how long it stays slow, does it happen when using extensions?)