It would be nice to have a indication of the (average) result size of a query / aggregation.

Sometimes a query may be (or look) fast, but has some deeply nested result or single items with huge amount of embedded items.

When fetching the first 50 items in a result, Studio3t could display: "Avg. line size: 1234 bytes, page size: 61.700 bytes".
When clicking "count documents" (eg. 456 documents), there could be a "Approx. result size: 550 kiB".

This way a developer can approximate, how much traffic a query will generate and take this into account, eg. by adding projections, limiting the date or whatever,