Since we upgrade from DNN 4.8.2 to DNN 5.6.1 in early june, we notice performance issue in setting pages.
I don't know if it was posted already posted but I it was not in the change log for DNN 5.6.3, so here we go

Pages affected: All setting pages with security role permission list (Module settings, page settings, file manager, etc)
Condition: Have a lot of security roles, not classed in groups. In my case, I have 1 parent portal (portal 0), 10 child portals. Each roles,users,user roles from child portals are shared to portal 0. In total, 477 in portal 0 (note that the biggest portal has 322 roles, portal 2)

Whenever I  open setting pages in portal 0 or portal 2, my FF/IE freezes and took very long to load. When there is a postback in this page, let's say custom setting in module settings, my FF/IE takes like 1 minutes or more to reload...
On portals with a small amount of roles, this works fine.

Was there any changes in how roles are loaded in these pages since DNN 4.8.2?