Fixes for some things don’t work like that. It may take major patch work to remedy the situation when it comes to these things. That’s what we’ve seen in the past.
Linking these here in case anyone thinks this is isolated.
https://us.forums.blizzard.com/en/wow/t/why-is-gorgrond-basically-unplayable/836627
https://us.forums.blizzard.com/en/wow/t/lag-in-gorgrond-on-area-52/842166
https://us.forums.blizzard.com/en/wow/t/terrible-zone-lag/688934