Illustrator 2019 running at 100% CPU

[jonathane58795059]

A colleague is having issues with Illustrator.
They are working on 2 simple files. Neither particularly large or complex

The PC is hitting 100% CPU usage- All attributed to Illustrator.
The PC specs are higher than recommended.
I have followed the steps provided on both

https://helpx.adobe.com/in/x-productkb/global/high_cpu_usage_cephtmlengine.html

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html#

I am at a loss now. Illustrator is integral to his daily work and as things stand he can't use it without this issue.

Can you offer any further advice?

Regards,

Zach

[ryan_edwards]

I would try checking preferences>performance

Maybe restart the machine as well?

[jonathane58795059]

Re-Starting doesn't help- It may not happen to start, but before too long the same issue occurs.
The performance is fine. I have seen people mention a bug where Illustrator eats the CPU, but the 'solutions' haven't worked in this instance.

[LoganHe]

The same issue here, why did Adobe make Illustrator worst instead of making it better.