Also experiencing the same issues on iOS 16

Did you find any solutions to the performance issues? I am facing similar issues.

I actually wrote an article on this topic. You totally can do it (and it works very well). Adding Google Mobile Ads (Admob) to your SwiftUI app in iOS 14.5 https://hrtlabs.medium.com/adding-google-mobile-ads-admob-to-your-swiftui-app-in-ios-14-5-5073a2b99cf9