At work I deliver high performance reporting, a Mojolicious::Lite app queries the database via user provided params, returning the data as json to the frontend (HTML5 Mojo template + Datatables.js). Not only is it super performant, it lets the end user sort by column, filter the results grid, remove columns and select rows to export as Excel, csv or PDF (example).

Update: fat thumbs/typos

Update 2: see DBD::CSV for a method to query your CSV file, if appropriate.