When loading the initial large page, the first tab may render before the rest of the data is down, and it's not clear to users when the load is completed. Added a visible message that disappears once loading is complete.

Also discussed with GN ways to speed up the interface, and a new idea emerged: we could load only the table for the initial tab, and get other tables later if/when the user clicks on their tabs. This would improve initial page load significantly, at the cost of some delay when you want to access another tab; but much of the time, the user is working only in one or two tables anyway.