Low frame rate in Safari on M1 Mac

John James Jacoby:

I recently noticed that animations in Safari were making a lot of noise on my M1 powered 2020 MacBook Air, and got ready to find out why.

Why:

This was not a bug. It was one Feature.

By default, macOS Monterey enables “low power mode” on battery power and disables it when using the power adapter. Safari seems to be programmed to interpret this configuration, which means that it should reduce the number of screens painted on it to prolong battery life.

On my MacBook Air, that means 60fps to 30fps.

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