https://www.pcgamer.com/apple-apologizes-for-throttling-intel-cpus-inside-macbook-pros-issues-fix/

Following numerous reports of MacBook Pro laptops aggressively throttling the CPU to keep temps in check, Apple has come out and acknowledged the issue, blaming it on a bug in the firmware, and issued a fix. It also apologized to affected customers who "experienced less than optimal performance on their new systems."

The issue drew widespread attention when a YouTuber David Lee posted a video showing a premium MacBook Pro configuration with a Core i9-8950K inside. Within a few seconds of running Adobe Premiere, it would throttle to below the processor's 2.9GHz base clock.