Help window is still a CPU pig - R2019a
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Continuing the slew of complaints I've found for previous versions: more often than not if I leave the Help window open, in the background, not doing any word search, it suddenly grabs a huge percentage of my CPU.
Seen under Windows 10 and 11.
Yogesh on 7 Sep 2022
The ability to limit the CPU usage by the MATLAB process is not available in MATLAB, you must configure your operating system to schedule things differently.
On the Windows platform right-click on the MATLAB process in the task manager and selecting a lower priority.
You could also try tools for this purpose. For example: