Just that jq does two things: 1) ingest and 2) query.

If you're doing a bunch of exploration on a single dataset in one period of time or if the dataset is large enough and you're selecting subsets of it, you can ingest the data into a database (and optionally toggle indexes).

Then you can query as many times as you want and not worry about ingest again until your data changes.

All three of the tools I listed have variations of this sort of caching of data built in. For dsq and q with caching turned on, repeat queries against files with the same hashsum only do queries against data already in SQLite, no ingestion.