What is the reason for a slow Firefox on a new powerful laptop? (with no other programs running and with no infection of viruses or adwares)

''dupe of https://support.mozilla.org/en-US/questions/914529''
With about 1500 bookmarks and just 4 active Firefox extensions on my new laptop (Dell XPS L502, Core i7, 6GB of RAM, Win7 64-bit Ultimate) my Firefox boots up and works real slow. by slow I mean it boots up in 15 seconds; and with 3 tabs open when I switch tabs, it takes 5 seconds to switch to the new tab some of the times!). Internet Explorer and Chrome work much faster and I think this is not normal for Firefox. what can be the problem?
Can this be because of my VGA card? my system has 2 VGA's; the 2GB GT540M Nvidia graphic card which is not active by default for Firefox and an Intel on-board VGA which is working by default for normal usages like browsing.
I do not think this is a virus or anything, I have Updated malware and virus protection; and my RAM and CPU are not more than 25% loaded when running Firefox.

''dupe of https://support.mozilla.org/en-US/questions/914529''
With about 1500 bookmarks and just 4 active Firefox extensions on my new laptop (Dell XPS L502, Core i7, 6GB of RAM, Win7 64-bit Ultimate) my Firefox boots up and works real slow. by slow I mean it boots up in 15 seconds; and with 3 tabs open when I switch tabs, it takes 5 seconds to switch to the new tab some of the times!). Internet Explorer and Chrome work much faster and I think this is not normal for Firefox. what can be the problem?
Can this be because of my VGA card? my system has 2 VGA's; the 2GB GT540M Nvidia graphic card which is not active by default for Firefox and an Intel on-board VGA which is working by default for normal usages like browsing.
I do not think this is a virus or anything, I have Updated malware and virus protection; and my RAM and CPU are not more than 25% loaded when running Firefox.

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