Apple MacBook Pro 2018 - The Throttling
Dave Lee found out about this:
That's what you get when you put the Core i9 CPU into a small notebook case, without enough head dissipation.
Another video mentions the throttling as well and offers a solution of sorts - downloading an app that e.g. controls the fans:
Congratulations @tuxfriend! You received a personal award!
You can view your badges on your Steem Board and compare to others on the Steem Ranking
Vote for @Steemitboard as a witness to get one more award and increased upvotes!