> For development, we had a ?queries=1 query parameter you could add to the URL to show the number of SQL queries and their total time at the bottom of the page. Very helpful when trying to optimize this stuff. "Why is this page doing 350 queries totalling 5 seconds? Oops, I must have an N+1 query issue!"

I'm so glad Symfony (PHP framework) has a built-in profiler and analysis tooling there...