You are not alone, since Elsweyr lag is everywhere the game jerks , audio is delayed or non existent, everything is extremely delayed , cant bar swap abilities dont work, invisible enemies.. to name just a few problems..
Dungeons are an absolute no go ! You can get away with easier dungeons even if it visually still a big mess ,only because they are easy and it doesn’t matter if you mis a mechanic for example.
But its a real shame Me and my friends have had to put a halt on doing the harder dlc dungeons until its sorted out.
If i dont notice an increase in game performance after mid week maintenance i have decided i will be unsubscribing from eso plus and probably stop playing altogether. Really is so unenjoyable at the moment.
There are some standard troubleshooting steps in the link below that can help with frame rate issues while playing.
What do I do if ESO is having performance issues on Xbox One?
If the issues continue, you can open a ticket with customer support to report this issue.
It’s super frustrating that Zenimax Online don’t even acknowledge the issue or let us know it’s atleast being worked on.