When loading a single player it is unstable frames. According to my friend that has 2.2Ghz CPU and 1.2Gb of ram "Runs Smoothly"(Laptop) but me 3.5Ghz and 8Gb of ram AND gtx 1060 3gb(Desktop) lags as standing still is 300 frames but turning gets me 30-15 frames just for moving making this snapshot unplayable. Unless you know about this already but for me I didn't see a single thing on here.
Your friend might have a framerate booster modification installed in his/her laptop.