Okay, so...
I have the ASUS ROG G752VL GC049T with a GTX 965M with 2GB DDR5 VRAM.
I watched a few youtube videos where people play Fallout 4 on a similar laptop (some MSI which has exactly the same GPU with exactly the same amount of VRAM, the only exception being a weaker CPU and less RAM.) on HIGH setting. I've tried doing the same... it starts lagging on medium! What's the trick here? 😛