A few things you could try before that.
1) do a game repair (assuming you haven’t already)
2) delete the shader file and the user.ini they will be rebuilt when you next launch the game. It will take slightly longer than normal and you’ll have to re apply some settings for graphics and such.
3) on windows open your command prompt and type in ipconfig /flushdns this won’t cause any harm to anything and may improve your overall performance.
If that doesn’t help anything you could try a reinstall.
you can delete ESO_BUILD_BRANCH safely, or move it to the desktop first if its alright then you can delete it.