Re: This is pissing me off!!
So do you mean the actual game framerate (rendering) is dropping? Or you are getting lag spikes?
If its your framerate, its most likely something on your PC or a game bug. I've never heard of anything network related actually decreasing game performance since that should be all up to the CPU and video card.
You may want to try reinstalling your network drivers.
The only other thing I can think of is that since the engine matches the game speed to the framerate (most games aren't like this) that it also matches framerates when you play online. I've heard of some RTS games doing this in the past and if you're playing an opponent with a crappy system, it'd make your game run like ass as well.
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