Has anyone seen similar issues, CPU usage stuck at 99% even when the program is just idle?
Regards
Phil
Have look here.
Hi @PhilG1300. There are a few known causes of high CPU usage. If you would like, I can suggest some experiments to determine whether any of those is the cause.
The most common cause is the antivirus software. This can be checked by 
TEMPORARILY disabling your antivirus for a short time to see if the problem goes away, then turn the antivirus back on.
If the problem doesn't occur with the antivirus off you will need to adjust the settings of your antivirus to put the appropriate file, folder, or process on the "allow list" so it doesn't interfere with compilation.
Please be cautious about working without an antivirus. This is only about temporarily disabling it for a quick test. If you don't feel comfortable doing that, fine. You can try going straight to configuring the antivirus to not interfere with the Arduino software.
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