Question Decreased laptop performance on external monitor

Sep 13, 2019
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So I have an MSI ge72mvr apache pro (1070, i7-7700HQ, 1080p display) and recently I decided to hook it up to a Viewsonic VX2457(which has the same resolution at the laptop's display). However, once I did I noticed my performance in more graphically demanding games (Titanfall 2, Destiny 2, Overwatch) was about half what it was before. I tried updating drivers, windows, the laptop's BIOS, and basically anything else I could think of.

Any help would be greatly appreciated.