User finished tests page with success only and ltc only takes too long

[peregrineshahin]

Assuming a fresh server where the runs are not cached.. a page like this https://tests.stockfishchess.org/tests/user/sg?page=4&success_only=1&ltc_only=1 can take too long, the fact that finished pages without specifying a user is very fast suggests that the username is indexed last..
I wonder how would indexing first the username would fair, or if finding the related runs for a username with python can be any faster because this page can take more than 15 seconds.
Again beware that the runs can be cached.