Why are even older games stuttering (SLI is disabled)?

#1
i've got the base model with 2630QM, 16GB RAM, Samsung 850pro SSD

on a lot of Steam games I own, even CSSource (which is more than 10 years old) running 480M, how come this is stuttering? On another laptop I have using K1100M Quadro (lesser performing GPU) I came at 1080p max settings NO PROBLEMS, but the CPU is faster.

any tips/thoughts?