internet browsing

Pc spec: Pentium 4 630, gt 710 lp 1gb, 3gb ddr2 ram. Sure not the best pc but on windows 8.1 web browsing, youtube and reading mail was smooth fast and very responsive. Why is this not the case on windows xp? everything is laggy slow unresponsive, sometimes pages take like a minute to load! its...

Here is my story, i have been trying to decide on the visiontek 280x, the EVGA 960 SSC, and the MSI r9 380 gaming. i google search 280x vs gtx 960, and, the 280x wins. BUT.. the 280x they use is $380, mine is $200. So, will the 280x still be better? and i dont know if the 380 is better than the...