I'm seeing this same issue. My MacBook Pro fan goes crazy whenever the simulator starts up and runs my apps. Similarly, when I test on an actual device, my iPhone gets hot. I live in Arizona and summer is coming. This sort of bug will make it impossible for me to hold my burning-hot laptop. : ) I'll submit a Feedback. Hopefully you all will too so this gets Apple's attention.

I have been seeing these since Xcode 13.1. Let us know if you figure out a way to make it stop! 😣

I'm running into this same problem on iOS 15.4.1. It seems my WKWebView is crashing and becoming unresponsive. Did you find a fix?