Lately, App Config has become rather slow in responding to role assignment changes. It can take up to 15 minutes for any role assignments in the portal to be recognized by the service. This is not a huge deal for me, as I am a member of the Owner role. I can always switch over to accessing the resource using access keys, but not all users have that luxury.
It's not a critical problem for us, it's merely annoying.
Are you aware of this, and/or are you looking into it.