If you see a non-essential application using 90% or more of your CPU, click on it and hit the button in the top toolbar to Force Quit it.
If your Mac is suddenly running hot or lagging, a rogue process might be draining your CPU or memory. mac reviver
Before paying for a third‑party utility, explore what macOS offers for free. The Storage Management tool alone can free up substantial disk space without any additional cost. If you see a non-essential application using 90%
: Temporary cache files, broken localized language files, and old update logs consume valuable storage space. broken localized language files
Note: There is also a local service provider in Mountain View, CA, named Mac Reviver