Why is Firefox 3.6 soooo slow to load and start?

I recently upgraded my version to 3.6 - as advised on your website when I saw a newer version was available. However it takes ages to load up and start. It can take at least 5 minutes to start up! Driving me to start using IE!!! I have uninstalled and re-installed from your website several times and it doesn't change anything. I have used a new profile and still the same! Occasionally after 10 mins it comes up with a dialog box say Firefox can;t find or is having trouble running a script. After first seeing this I uninstalled and reinstalled again as I thought it had become corrupt. But after doing this several times it is still the same old slow Firefox! And I thought new versions were supposed to improve things!
== This happened ==
Every time Firefox opened
== When I upgraded to the latest 3.6 version

Your Firefox settings and info are kept in a folder separate from the Firefox program, called your profile folder. Try creating a test profile, to see if the problem still occurs. See [[Managing profiles]]or One of your add-ons might be the culprit too. Try running Firefox in [[Safe Mode]] with all add-ons disabled. If that solves the problem, see [[Troubleshooting extensions and themes]] and possibly [[Troubleshooting plugins]]

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