Using pre-calculated web template

I have a query that takes 20 seconds to load on our web portal. I've done everything imaginable to optimize performance. Finally I'm experimenting with pre-calculating the query. I've created the reporting agent setting, set the calculate parameter to 'HTML for Web Browser', added this to a schedule and successfully ran the schedule.

Now when I run the corresponding web template on the web it still seems to take the same 20 seconds. I would think all it has to load now is a static HTML page so it should take 1 or 2 seconds. How do I know if it's really loading the pre-calculated version or the normal one? I'm not sure anything is really happening. Maybe I missed something? Anybody have experience with this?

Thanks,

-Patrick