Thanks for the reports and we are investigating these performance issues.
- Foxford;c-6922649
UPDATE!
POSSIBLE FIX.
Somehow managed to fix it. What I did was I set to run client as administrator, restarted the pc, and then launched the game again. During the launch my antivirus, avast, asked me if i want to block eso from accessing and changing files which i set to "No". After loading a game I checked the checkbox as always and voila.
Only thing I noticed is that it enabled all addons, even the ones which were previously checked off.