What causes WindowServer performance issues on Mac, and how

WindowServer performance issues on a Mac are commonly triggered by factors like too many open windows, several high-resolution monitors, heavy graphic applications, a lot of browser tabs, or macOS visual effects like transparency and animations. Besides these, an outdated system, faulty applications, and display-related problems might cause an increase in WindowServer's CPU and memory consumption. The best way to tackle these problems is to shut down the unwanted apps and windows, minimize the visual effects from Accessibility settings, keep your OS and apps updated, and unplug any unnecessary external displays. Besides that, a system reboot and using Activity Monitor to spot resource-hungry programs could also be a way to find and fix the root cause of the higher WindowServer activity.