Features like faceting, foreign key expansions and now the inspect-less index view mean Datasette can end up executing a surprisingly large number of SQL queries to render a single page.

Past experience with projects like tikbar have shown that being able to see what actually went into rendering a page can be critical for optimizing performance and generally understanding how everything works.

Support a tracing mode (probably via a ?_trace=1 querystring) which adds information about what is actually going on to both the HTML and the JSON.