You can do this by installing cpulimit. You can limit a certain running application either by name or by process ID:

cpulimit -e firefox -l 30

This won’t let Firefox go beyond a 30% CPU usage limit.

If you’d rather go by process, you can do it like this:

cpulimit -p 3493 -l 40

This will limit process number 3493 to 40% CPU consumption.

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