Coatmagic, you are not alone. Here is another thread regarding the same problem.
https://forums.elderscrollsonline.com/en/discussion/482698/text-illegible-since-todays-patch-help-pics#latest
For myself, I am running ESO in Bootcamp on a Macbook Pro 2015. I usually keep around 30 FPS in open world. I cannot use windows fullscreen as it sets my FPS to around 5.