Fixing High WindowServer CPU Usage (160%) in macOS Sequoia on MBP 2015

guide MacBookPro macOSSequoia OpenCoreLegacyPatcher Troubleshooting WindowServer

Tutorial: Fixing High WindowServer CPU and Sluggish UI in macOS Sequoia (OCLP)

If WindowServer CPU usage spikes to 150%+ and slows down window switching on your 2015 MacBook Pro running macOS Sequoia, this is caused by rendering conflicts in legacy graphics drivers. Follow these steps to resolve it:

1. Reinstall OCLP Root Patches with GPU Cache Reset

  1. Launch OpenCore Legacy Patcher.
  2. Click Post-Install Root Patch -> Revert Root Patches.
  3. Reboot your Mac.
  4. Open OCLP, run Start Root Patching to apply fresh graphics and wireless drivers, then reboot. This clears stale kext caches causing high WindowServer CPU loops.

2. Disable Electron App GPU Acceleration

Apps like Slack, Telegram, and Chrome run on Electron/Chromium, which forces GPU rendering through Apple's patched Metal stack, triggering WindowServer overhead. Disable hardware acceleration in these apps:

  • Google Chrome: Settings -> System -> Toggle off "Use graphics acceleration when available".
  • Slack: Preferences -> Advanced -> Uncheck "Use hardware acceleration".
  • Telegram: Settings -> Advanced -> Turn off hardware acceleration.

3. Adjust OCLP Graphics Settings

  1. Open OCLP -> Settings.
  2. Go to Developer Settings and toggle Feature Unlock off if you don't use Universal Control (this reduces rendering overhead).
  3. Rebuild OpenCore and write to disk, then reboot.

Original Question: "Running Sequoia on MBP 2015 with OCLP and WindowServer is at 160% CPU usage"

Hey,

Last week my 2015 MBP started acting up. It was hard to use the OS because windows took forever to move around and switch between. Window Server had 160% CPU usage.

I tried restarting and that didn't work. I tried having less windows open and that works but it is not a good solution, since this is my work laptop.

Anyone else running into this problem? I have no idea how to debug this since this is an OS process.

I've turned off translucency, motion, and even turn it to just 1 virtual desktop.

Things I've noticed:

* turning off apps that are known to be very inefficient like Slack or Telegram or Chrome helps. But I also need these things for work lol

Please help.

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