There are three main source engine games I have never been able to run very smoothly in the past couple of years the games are Insurgency, Day of Infamy and Counter Strike Global Offensive. My basic rigs specs are a intel i5 6600k, GTX 1070 strix ROG OC edition, 16 GB of corsair RAM and windows 10. All these game run over 60 FPS but every few seconds I get a stutter problem and the FPS quickly drops and then returns to normal. I have no idea how to make these games run better I have tried quite a few things in the setting I have also tried locking the frame rate but that also doesn't work...... What should I do?