Improve your Ubuntu performance
When you install the Ubuntu system on a physical machine, don’t forget to do these things to improve your computer’s performance.
My experiments found that the improvement was very noticeable, based on Ubuntu 20.10 and my hardware.
Use s-tui to monitor and test your max CPU frequency

How to install
sudo apt install python3-pip stress
python3 -m pip install --user s-tui
How to use
sudo s-tui
You can use the arrow keys and space bar to switch between Monitor mode and Stress mode. The Stress mode performs a stress test on the CPU.
Use indicator-cpufreq to set your CPU frequency

How to install
sudo apt install indicator-cpufreq
sudo reboot
How to use
Look at the status bar icon in the upper right corner and click on the emerging icon to set the CPU’s performance mode.
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