Games still lag even after upgrade

NDDU Julius BSIT

Respectable
May 19, 2016
476
0
1,810
I fail to see what causes the stuttering and lag on my games.
I am playing on my notebook which has:
Intel Core i5-6200U 2.80 GHz
Nvidia GeForce GT940MX 2GB DDR3
12 GB DDR4 RAM (upgraded yesterday from 4GB)

I notice things start to lag when I turn the resolution up. I monitored the stats using MSI's Afterburner OSD setting and my GPU isn't even at its maximum state (the VRAM is about 1.2GB or less)