What are the differences between Counter Strike: Global Offensive and Counter Strike: Source

I just found this (<- click)

A user of this forum seems to have both versions and listed the pros:

Well, I've owned the GC version and I currently own the PS2 version.

GC pros:
Faster loading times
Smoother graphics/almost no slowdown

PS2 pros:
Extra playable character Dante
A new difficulty, "Sweet," it's the easiest difficulty in the game
Better unlockable music video

I hope you are still interested in the answer.

As of csgo, there are no real configs that could really affect your fps, aside from those in the video settings, so those are the only ones that you can tweak around and test with.

Even the developers said a hardware upgrade is probably the best solution to a low fps problem.

I would say it is purely your graphix card's limit, instead of the game settings.

Hope that helped.