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