If you go into layout mode, then select "Show sample data", do you get it as well ?
Yes siplus, same thing happens in Layout mode with "Show sample data" active. Does that mean anything?
no, it just means it's independent of mode ...
To quickly identify the summary fields and other culprits I'd take a look at this post.
It does not solve the original problem but it helps you a bit, I hope...
That is a very handy tool indeed! While not every summary field is generating a delay – that's where seeing the status screen would be handy – this does give me a complete list. Thanks!