So I just installed ubuntu 20.04 on a laptop, and everything was working great. I noticed there was an issue when I would plug in a second monitor via HDMI, once it picked up the display and there was dual monitors, the laptop started to run very slow. Like clicking on item, it would take a while to do something, moving windows, switching between them, video on youtube slow motion, just over all slow. Once I unplugged the external monitor, everything went to working fine again, the laptop was fast again.Any ideeas, please? Thank you!
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I had a very similar problem, and solved it using the top solution from this thread: 20.04 on external monitor (2560x1600) extremely slow. So this might be a duplicate problem (I'll let someone with a higher reputation score decide that).
Specifically, I ran $ nvidia-settings, went to "PRIME Profiles" and changed from "NVIDIA On-Demand" to "NVIDIA (Performance Mode)". After restarting my computer I no longer experienced any lag when using dual monitors.
See the linked thread for an image of the relevant Nvidia settings window.
Matt
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