Oh wow – I just did a refresh on that page that I listed above and the lines I quoted are no longer there. Huh, weird. But I assure you they were there – I copied/pasted right from there to this forum.

Following up on my original post.. I updated to Xcode 14 RC but I'm still seeing the same issue: "This method should not be called on the main thread as it may lead to UI unresponsiveness" warning. I believe it is happening when WkWebView.load(URLRequest) is called. If I comment out the particular load() call, the warning isn't displayed.