Playing on a ROG Laptop with i7-4710HQ, GTX 980m, 16 GB RAM and installed on HDD.
With all settings in very high at 1920x1080, I feel that the game is running smoother than previous build, aside from the occasional scope lags that have been mentioned before and that are not even so bad on my end.
It is still definitely not as swift as Insurgency2 was, but the engine is also more demanding. I can't pinpoint where random lags are coming from (particle-intense scenes like firefights?), but to me the key issue would be unstable ms (shoots anywhere between 65 to 200). I can't wait to be able to choose my server to get steadier latency, which I think should help quite a bit in attaining a smoother experience overall!