Almost every time in-game the character starts moving in slow motion and once its over someone kills me! D: Is there any way to stop that?

You have to lower your graphic settings. Go into the lobby and do the following:

What zaebja said is good but you can reduce lag even more.

This is for windows vista & 7.

go to your desktop main screen (minimize everything) right click and go to "personalize" then go to "theme" & find "windows classic"

or if you don't see that then go back to "personalize" and go to "windows color & appearance" and select windows classic.

that will reduce the animations on your pc making your pc speed up a little.

also you can run gamebooster which stops all "non-important" processes & applications that are running.

I think I'm going to check for memory leaks. I've seen random frame rate drops to ~40 FPS from an average of 140-150 in small parts of the map.

yeah, my friend fps drops

Thanks for helping

Updated on the Memory leak check:

None found on my end, steady +/- 25MB