Computer Running Slow after prolonged intenet browsing

[m1k3]

Hi All,
I have a laptop HP g series {2gb ram;500gb HDD;i3;inbuilt 2gb ATI radon} Running on windows 8.1.
What exactly i noticed is that my system works slow after prolonged internet surfing.
I do that normal steps to keep my computer boosted eg:clearing cache,defrag, diskclean up. Is it because of some virus that exist and become active only if i start internet? Please suggest. Thanks in advance.

[patio]

FireFox ? ?

[Verylost]

First thing I noticed is you should upgrade to at least 4 gigs of ram that would be a huge help.

I to get slow running internet after extended browsing; guessing that something inside gets overheated; not to a danger point ; and
it needs to slow things until it can cool down getting back to a normal range.

Would love to track all software and hardware / everything on the computer that has a heat signature and get that printed out and see
whats out of the normal high / low heat range and then go from their .  .  .