Rafael Mestdag :
KillSwitch07 :
Can we get some specs?...
AMD 64 X2 4800+
6100 nVidia Motherboard
GeForce GT630
4GB DDR2 800
PSU: 400W
OS: Windows 7 64bit Ultimate
Well, that's a pretty low end cpu, and a overall low end build. (No offense) The cpu usage will be spiked, especially depending on how many tabs you have open, resolution, and depending on your browser, you might not have a hardware accelerated mode, meaning the gpu wont be utilized fully, nearly all of the load will be on your cpu. When you change tabs the cpu usage goes down because that tab that was just using all of your cpu is now a background process, it is cached and audio is playing but the cpu doesn't have to display it so it will naturally be a lower load. There's not really much you can do about this either.
Also, on the note of browsers, depending on your browser, (especially chrome) it will eat that 4gb of ddr2 at 800 Mhz for breakfast. Don't expect amazing performance with this...