CPU Usage on 100% During Export

Changes were made with the release of Lightroom Classic 11.4 to shift part of the Export processing load to the GPU. As a result, CPU utilization should change for some operations. 

Many have complained that LR is unusable during exports, and sometimes their entire computer is unusable:

https://feedback.photoshop.com/photoshop_family/topics/classic-cc-uses-90-cpu-during-export

Please add your constructive opinion and details of your issue to the bug report, and be sure to click Me Too and Follow in the upper-right corner. That will make it a little more likely that Adobe will prioritize a fix, and you'll be notified when the bug's status changes. (Simply linking back here will generally be ignored by Adobe.)

There have been a few statements by Adobe employees over the past several years that, after Export was changed in LR 6 / CC 2015 to use multiple cores more effectively, they intended that Export would consume most but not all of the available CPU, which would allow for interactive use.  I found one of those statements here:
https://feedback.photoshop.com/photoshop_family/topics/lr-cc-2015-2-and-up-cpu-usage-on-export-on-25...

See this post for a workaround that restricts LR to using a subset of the virtual/logical processors:

https://feedback.photoshop.com/photoshop_family/topics/classic-cc-uses-90-cpu-during-export?topic-reply-list[settings][filter_by]=all&topic-reply-list[settings][reply_id]=20440860#reply_20440860 

E.g. if you have 16 processors, restricting LR to use 12 is a good compromise, leaving 4 for interactive use, while still letting export and merges use most of the computer.

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No fix? I do have a i9 9750h and experiencing this myself. CPU stays at 100% usage the whole export time(95 Degrees Celsius) and cursor it's choppy. Audio on spotify also. Pls help

If you are willing to let the export process take longer, you can use your OS tools (Windows Task Manager or the Mac equivalent) to lower the process priority of LR before you start the export. This will smooth out the system throughput.

AzzBlock  wrote When exporting my RAW images to JPEGs to send to clients Lightroom uses up all of the available CPU power which makes the mouse stutter and makes it very hard to do any other task whilst the export is occuring. This is not a new problem. It has been happening for quite a while now since version 6 or 7, I can't remember exactly but I do know this wasn't a problem with older versions of Lightroom before the Adobe Subscription service. I've tried enabling/disabling GPU utilization and that made no difference.

I think this is expected behavior by Lightroom. Exporting is a very CPU intensive task, and it will use up most of the CPU power. They did change the behavior a few versions ago (I don't remember when) to make more use of the CPU, causing some CPUs to hit 100% on long exports.

I own an Intel i7 3.4GHz CPU so lack of power isn't the problem.

You can say this all you want, but the evidence is clear: your CPU is at its capacity on this task.

Make sure Sync, Address Lookup, and Face Detection are all paused as shown below.