MacBook Air’s fanless design hits a wall under sustained load.

It does. The Air is not built for long, heavy work.

The MacBook Air uses passive cooling — no fan means no noise, but also no way to move heat away when the chip is working hard. The M-series chips are efficient, so casual browsing, writing, or streaming is totally fine. The laptop won’t even get warm. But if you’re rendering video, compiling code, or running a large spreadsheet for more than a few minutes, the chip will eventually throttle. It has to — heat builds up and the system slows down to protect itself.

The MacBook Pro with fans can sustain higher performance because the fans actively pull heat out of the chassis. The chip runs at full speed for as long as you need it. You’ll hear the fans spin up, but you won’t hit the same performance cliff.

So if your worst task is “fifty Chrome tabs,” buy the Air. If you regularly do something that makes the fans kick on for more than five minutes on a Pro, you need the Pro.