[rienko]

To me this happens when the CPU starts throttling due to high temperatures, if you don't have something like menumeters installed it probably won't show itself on any other native Mac GUI.

For a long time the workarounds I've used to deal with this issue:

1) Charge from the ports on the right! The charging circuit on the left aggravates the issue.

2) Disable turbo charge by setting the mac into low power mode inside system preferences -> Battery

3) Raise the computer from the table for increased air flow, and not be in contact with latent warm from the table. Which has been heated by the mac itself.

4) Lower AC temperature

5) Change the Fan Speed from Automatic (default) to fullblast, or make it sensor based but lower the min/max temperatures for the fans to start spinning faster 38-60 celsius

[ndrake]

I was having throttling issues with a new 4k monitor. Teams seemed to make the issue worse. Pointing an external USB cabinet fan at the laptop has resolved my issues.