2nd + tabs in Firefox go slow...?

ok so
i have had firefox 3 for a few months now
and just this past week
whenever i use a 2nd tab, it goes slow, the first tab goes fast but the second, 3rd, 4rth... ones go slow...
does anyone know how i can fix this or why its happening?

i even re-installed firefox today and its the same

Answers:    try disabling add-ons, go to Tools>Add-ons
try increasing your diskspace and RAM. If that doesn't help, you may have spyware/malware or a virus.
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