If this was the problem you fixed Please tell me how exactly did you fix it ?
what did you uninstalled and re installed ? because there is no installation for the game !
this is exactly my problem and is still doing it. zero idea how to fix it still.
Is Your Graphic Card AMD ? i tried the game with my Intel card ant it worked no problem .. the thing is that my intel is not strong enough so it lags , and that's why i need solution to make it work with the AMD
says "AMD Radeon Graphics / AMD Catalyst Control Center" under what controls it. as far as lag, just struggle into the options and turn the water display settings down all the way and that will fix your lag.