High CPU Usage by WindowServer on Mac

My laptop's running slow, and Activity Monitor shows WindowServer using a high percentage of CPU. I'm not sure what WindowServer is, and I haven't installed anything new recently. Restarting the process just restarts my computer. Any ideas how to fix this?

This rewrite clarifies the issue and avoids making assumptions about what the user might have installed. It also rephrases the ending to ask for help in a more positive way