My laptop is getting poor performance with very low settings and high enough specs

[BLTea]

Hi all,

I've been trying to run Super Smash Bros Melee (SSBM) through my new Lenovo w550 but my game will jump around between 50 and 60 fps, when I need it to stay at 60. I have all the recommended settings from the Dolphin performance guide, and am even running the game at 480 resolution, even though my screen is 1080p. I've run SSBM through Dolphin on my desktop for several months with no problems (performance or otherwise) whatsoever but cannot get it to perform on my laptop. It has not had issues running any other sort of game or program.

Specs:
i7-5500U
NVIDIA K620M 2GB
8 GB SODIMM RAM

EDIT:
Also forgot to mention that I am running Dolphin 4.0-7161

Thanks!
BLTea