Why high w3wp CPU usage causes your website to choke
![](https://mvolo.com/wp-content/uploads/2021/12/W3WP_IIS_ASPNET_High_Cpu1.png)
High CPU usage in the IIS worker process can cause poor IIS website performance … even if the processor is not completely overloaded.
This can lead to high CPU hangs, 503 queue full outages, and higher-than-needed cloud costs.
Learn why it happens and how to fix it in our High CPU usage in w3wp.exe guide.