When I started playing SK, I got the original client and I could play perfectly. Then a few months ago I converted to Steam (which was probably the stupidest thing I've ever done since it makes the loading time a bit longer). And now this update?
My god I have never experienced such lag as this! Playing a compound level is COMPLETE HELL with dust bunnies doing 360s in the air and I'm burrowing deep underground.... I mean... OOO WHAT DID YOU DO?!
In Haven 3! People are FLYING ALL OVER THE PLACE! LIKE FERREALZ!
....
Woah woah, just play without Steam. Simple.
Or play on Linux.