LoadCheckoutsTableDelay should work on circulation.pl (patrons check out page) and moremember.pl (patrons detail page) as on both pages the checkouts table is available. However the delayed loading is only working on circulation.pl while the table gets loaded immediately on moremember.pl. To recreate: a) set syspref LoadCheckoutsTableDelay to 5 seconds b) check out an item (39999000011418) to a patron c) notice the checkout table gets loaded after 5 seconds d) got to the patrons details page and notice the table gets loaded immediately
At least the code in checkouts.js implies that the feature should also work on moremember.pl (details) though the manual says it is to prevent too many requests while using the checkout page.
Closing as this seems to be intended (const LoadCheckoutsTableDelay = 0; in moremember.tt)