No. WindowServer is essential: without it there's no display.
It runs as _windowserver and isn't network-related.
When WindowServer's CPU climbs, the cause is usually what it's asked to draw: several 4K or 5K displays, dozens of open windows across Spaces, screen recording, or one app redrawing constantly. Closing windows, reducing transparency (Accessibility › Display) and disconnecting a display are the quickest tests. It doesn't use the network.
Facts
- Owner
- Apple (part of macOS)
- Network-related
- No
- Block it?
- Don’t block it
Should you worry?
No. WindowServer is essential: without it there's no display. High CPU means it has a lot to draw: many windows, external or high-resolution displays, transparency effects or a misbehaving app.
Frequently asked questions
Why is WindowServer using so much CPU?
It's rendering a lot: many windows, high-resolution or multiple displays, animations, or an app that redraws continuously. Close windows and apps to find the cause.
Can I quit WindowServer?
No. Quitting it logs you out, since it's what draws your session.
Does WindowServer use the internet?
No. It's purely local graphics compositing.