Just posting this in case we have the same issue …
I was experiencing lags/performances issues ; every 10-15 seconds the game was slowing down, almost freezing (despite a good computer) and it was pretty unplayable. Decreasing the video settings, disabling the sound and also the “fmodex64.dll” trick did not change anything.
But I solved it ! I change my screen resolution to 1280*800 on Windows AND also in the game (I did both, maybe only 1 is enough I don’t know) … it now works perfectly !!!
Hope this will help 