As the graph below shows, continual use of the CPU causes massive fluctuations in performance. Every 15 minutes the machines performance drops until the CPU cools enough for the turbo boost to be activated again. Each time getting worse.
For many tasks this will be fine. Even exporting/rendering for periods of 15-30 minutes would be acceptable.
But for using Cubase or Logic, with multiple tracks of instruments and effects, the result would be a total overload for a few minutes, at least 4 times an hour. I routinely spend a solid 4 hours composing and mixing tracks. Theres no way I could do that with system spikes like that.
"As usual, we also let the current MacBook 12 run Cinebench in a loop in order to analyze the long-term behavior of the notebook. The first quick glance at the diagram reveals that the MacBook 12 behaves oddly. The notebook starts at a good level. Then the performance falls slowly by about -10% before it collapses for the first time. Apparently the threshold of the passively cooling system is exceeded at that point and the CPU throttles significantly. It takes about 15 minutes before this occurs, whereas the processor can rest for a few seconds after each run due to the design of the test.
After the CPU has throttled for a while, it increases its speed again, but remains 15 to 20% below the initial results. After another six runs, the clock rate collapses again, this time even more noticeably than the first time. In the following, the score almost reaches its initial value, but it falls notably faster during the following runs.
The behavior can be easily explained with the passive cooling solution of the MB 12, which reaches its limits under prolonged load. As a result, the CPU has to throttle. The longer this takes place, the more "reserves" are available for the next try. The time it takes until the first collapse (15 minutes) should be long enough for most demanding office tasks. Thus, a noticeable performance loss is not to be expected here."
https://www.notebookcheck.net/Apple-MacBook-12-2017-Laptop-Review.230656.0.html