Well, I lag on Tf2, and I don't know why. I meet the requirements and stuff, and when I play on a single player game (Create server with 1 person limit) The movement and everything in flawless. I only lag on online servers it's not like 30 fps lag, it's like 8 fps lag.
How can I go about raising my fps?
Edit: You can ask for system specs, but it may take a while to type.