Mac Thermal Throttling: What It Is and How to Fix It
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Your Mac is secretly slowing itself down
Thermal throttling is when macOS reduces your CPU's clock speed to prevent overheating. It's a safety feature — without it, your CPU could literally damage itself. The problem: Apple gives you zero indication it's happening. No notification, no icon in the menu bar, no log entry you'd ever find. Your Mac just gets slower and you have no idea why. You might blame the app, blame the update, blame the WiFi. It was the temperature the whole time.
When does it kick in?
On Apple Silicon Macs, throttling typically starts around 95-100°C. On Intel Macs, it can start as low as 90°C depending on the model. The MacBook Air (both Intel and M1) throttles more aggressively because it has no fan — all cooling is passive through the chassis. The MacBook Air M2 famously throttles during sustained workloads because Apple put a tiny heatsink on a powerful chip. Even the MacBook Pro throttles under sustained all-core loads, especially the 16-inch models.
How to detect it
Watch two things in BreezeKit simultaneously: CPU temperature and system performance. If your temperature is above 90°C and you notice slower build times, choppy video playback, or laggy UI, you're throttling. BreezeKit's thermal alert system will warn you before you hit critical temperatures. Some users also notice the keyboard and palm rest area getting uncomfortably warm — that's the chassis dissipating heat, which correlates with throttling.
Preventing it entirely
Proactive cooling. Set BreezeKit's fan control to Smart mode with the CPU as the driving sensor. The fans will ramp up as temperature rises, keeping the CPU below the throttling threshold. On my MacBook Pro, this means sustained all-core workloads run at full speed instead of dropping 20-30% to thermal throttling. The tradeoff: more fan noise. But I'd rather hear fans than wait an extra 5 minutes for a build to finish.
BreezeKit — Your Mac, running cooler
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