Why would GetMessageW take up massive CPU usage in my WPF application?

Question

I\'ve got a serious head-scratcher on my hands here. I\'m investigating performance issues with a WPF component in our application.

Our .net application is very large,

Answer 1

Looks like your message pump is pumping a lot. Could be interesting to see what kind of message your message queue is filled of. Can you use Spy++ on your window to see what is going on?

Edit

I've misunderstood the problem.

Hans Passant is right, your program is just waiting on GetMessage for some event to process.