Go to Control Panel.Hardware and sound.Power options.Edit plan settings.Change advanced power settings.Processor power management.Maximum processor state and lower it to 80% or whatever you want.

How do I limit CPU usage?

You would want to set “Maximum processor state” to 80% for both “On battery” and “Plugged in” to limit the CPU to a max of 80% capability. In addition, you can set “System cooling policy” to active to help it run cooler. You might also check out a laptop cooling pad designed for your laptop model to help even more.

Is it safe to limit CPU usage?

The safe limit of a CPU Usage is maximum of 100%. Your CPU is probably reaching its limits of the performance it can provide. Upgrade the processor to a better one to achieve better performance in Games.