How many SQL queries WP Super Cache make to serve cached page?

I can’t tell you the answer to this off the top of my head, but if you want to look at the SQL queries (among other things) executed for any given page load, check out the black box debug bar plugin. I think that the debug bar plugin might have similar functionality as well.

Regardless of the number of additional queries a caching plugin makes, it should still cut down on your page load time…don’t want to cut off your nose to spite your face, right?

If you really want to focus on getting your queries down, you should look into database caching, which can be done by any number of plugins.