WKWebView Loading HTML Strings Taking An Extremely Long Time On Mac Catalyst (Ventura 13.2.1)

I have an area in my app where I load local HTML strings in WKWebView. Loading is fast on iOS. These local HTML strings are small.

On Mac Catalyst I added the ability to open this area of the UI in a new window scene (new window). And for some reason sometimes when I do this these simple HTML strings can take 10-15 seconds to load in the WKWebview in the new window.

These HTML strings are super small. I key value observed the loading property of the WKWebview and I hold the current date just before calling -loadHTMLString:baseURL:

Then when the web view completes loading I see how much time passed:

-(void)observeValueForKeyPath:(NSString*)keyPath
                     ofObject:(id)object
                       change:(NSDictionary<NSKeyValueChangeKey,id>*)change
                      context:(void*)context
{
     if (object == self.webview 
         && [keyPath isEqualToString:@"loading"])
   {
          if (!self.webview.isLoading)
          {
              NSTimeInterval timeInterval = [NSDate.date timeIntervalSinceDate:self.loadStartDate];
             NSLog(@"Web view took %f seconds to load",timeInterval);
         }
   }
   else 
  {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
  }
}

Sometimes it is taking as long as 5 seconds to load a tiny HTML string. When opening these WKWebviews in the same window I don't get these long load times. But when I kick of WKWebView inside a new window scene I often do.