Sounds like you might not have the right graphics drivers installed. For nvidia, you should be using the proprietary drivers. Iirc, mint has a nice GUI for changing graphics drivers, called driver manager or something like that.
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Is your laptop maybe in powersave mode?
You didn't provide any details, so wild guesses only here. idk about mint but on kde the button to switch modes is meta+B ... if your distro provides the right packages for that functionality out of the box. I'm sure there is a terminal command to check it too.
I have never used mint so I can’t speak to its gaming performance or optimisation tricks but I would be tempted to try out with a more bleeding edge philosophy (like Bazzite or Catchy or Nobara). They’re likely to have newer drivers and kernel etc. If that solves your problem - great!