AA is anti aliasing and there is an option for it in your video card drivers
2 quick things you can try
start the game up and check task manger
see whats hoging up the resourses CPU/ram while its...

do you have AAx4 or 6 turned on?
how do you connect to the internet?
and what are the other online games that have problems?

i'm not too familiar with your model of laptop but
generally laptops are not very upgradeable
aside from (ram, hd, swappable drive)
everything else is difficult because there is a lack of common...

i don't think more ram or another card will help
and definitely not cost effective

i would try another game if you have HL2 / Doom3 something fairly modern see if you still have that problem
...

There is usually some major change that happens in graphic card development every year. However, the technology behind it doesn’t really become utilized for some time.
Phasing out AGP will take many...

yep
for some reason one of the nvidia drivers messes up the gamma setting by default
if you go into your display properties
then get into the nvidia driver options
its somewhere in the color...