BondiBondi blog
Heat, fans and busy processes
Why a Mac gets hot and loud: kernel_task, WindowServer, the fans, and the processes that spin them up, from real readings.
- October 10, 2026 · 3 min readWhy is my Mac so hot and loud?Loud fans on a MacBook or any Mac mean the chip is working hard or running hot. Here's how to find what's heating it, and what to do if they won't settle.
- October 10, 2026 · 3 min readkernel_task high CPU on Mac? Your Mac is cooling itself downkernel_task at high CPU usually means your Mac is hot, and macOS is slowing apps on purpose to cool it. Here's why it happens and what actually helps.
- October 16, 2026 · 2 min readWindowServer using high CPU on Mac: what it means and what helpsWindowServer draws everything on your Mac's screens. Here's why it gets busy, what normal looks like, and the settings that actually calm it down.