The MacBook Air throttles hard under sustained load.

Not well. It doesn’t handle sustained heavy workloads.

The whole design is trade‑offs. No fan means silent and thin. It also means the chassis is the only heatsink. When you push the M‑series chip hard — video encoding, compiling code, exporting large files — the temperature rises until the chip deliberately slows itself down to avoid damage. That’s thermal throttling.

For bursty tasks (opening apps, web browsing, light photo editing) you won’t notice. The chip boosts high, finishes fast, and cools back down. But keep it pegged at 100% for more than a few minutes and performance drops significantly — sometimes 20‑40% below what a MacBook Pro with a fan would deliver under the same load.

This isn’t a defect. It’s physics. A fanless laptop cannot shed heat as fast as a fan‑cooled one. Apple optimizes for the 90% use case: lightweight, battery‑friendly work. If you’re a video editor, developer running long builds, or someone who renders 3D scenes, the Air will frustrate you.

If you need sustained heavy work, get the Pro.