My Gigabyte hanged again, probably because of overheating. Chrome became super slow after rebooting. It was eventually fixed after reinstalling. That is,
sudo apt purge google-chrome-stable rm -rf ~/.config/google-chrome/
and then reinstall by downloading Chrome from another browser.
Update: the problem does not seem to be fixed somehow… But turned off hardware acceleration seems to solve the problem. At least for now.
After rebooting, it looks like it is using Intel “GPU”. It may be the reason why it was so slow. After Nvidia GPU is turned on again, I will try to see if it is still slow turning back on hardware acceleration. For now, it is okay without GPU turning on as I’m not using CUDA.
Update: It probably is the GPU problem. Zoom is not working as well if I try to use Nvidia GPU. I probably need to reinstall the Nvidia driver or something. I don’t have time for that at the moment. Probably I will just reinstall the os during winter break.