https://techcrunch.com/2018/07/19/some-macbook-pro-users-complain-about-throttling-issues/

The new MacBook Pro has a thermal issue. YouTuber Dave Lee found out that the top-performing MacBook Pro can’t operate at full speed for a long time because it gets too hot.

According to him, a video export in Adobe Premiere Pro is taking longer on a brand new MacBook Pro with an Intel Core i9 CPU than on a 2017 MacBook Pro with an Intel Core i7 CPU (previous Intel generation).