

Just to narrow it down further, were you getting bad performance on Linux Mint too, or did you only install games on Kubuntu?
Another user mentioned that the power settings can have a huge effect, which also seems like a good lead to look into. You should be able to check it by opening your settings panel and going to the Power Management section. In there should be a Power Profile setting. If it’s set to power save mode, it’ll limit your performance quite a bit.
Sounds good! Let us know how it goes ^^