We have found out that not all of the realism vs relaxed realism settings are properly being enabled on servers.
Many of the Hud changes and loadout changes are not working as intended when the server is set to realistic. Also we've found that when you filter by realism servers it shows you relaxed realisms servers (and vice versa).
We'll hopefully have this fixed up shortly!
As a heads up I will shortly be requesting information from players who are having performance issues. We need to track down the performance theif or theives!