Takes a very long time to load pages and is laggy

The new''' FF (4) '''was good at first, but recently it is starting to lack the goodness it once had.
'''It is becoming slower and slower by the day and takes a very long time to load pages. Sometimes the "loading" icon circles for 5 minutes, and whether the page loads or not depends on my luck at that time.'''
Also, it has become seriously '''laggy''':
'''Scrolling''' up and down, typing and '''filling out forms''' (like writing this message) etc have slowed down.
I have deleted the history, and cleared the cache, but to no avail.
Could it be some of the add-ons?
Or is it that FF4 was all hyped up and '''''can't stand to it's name'''''? :)
Please help.
Info: Vista 64-bit, 4GB ram, 2.33GHZ....can't be my computer!

You could try to disable this feature for now by toggling this pref on the <b>about:config</b> page:
*devtools.debugger.source-maps-enabled = false

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