I played for a few hours between yesterday evening and this morning without any issues. When in Abah's Landing this morning my FPS went down to 7-9 range and stayed there. Having read the forums and knowing there is a hot fix upcoming, I logged off and decided to try again after it downloaded later in the day.
So, now during lunch I was trying again. The hot fix downloaded, I logged in, but the fps is still extremely low. I went back to Crag, still low. I switched to minimum settings and was getting ~20fps. Switched back to ultra high, still getting 7-9.
To test, I quit the game and launcher, and logged into a different toon (one that also has joined TG already) - it's FPS was normal (30-45+) on ultra high.
So, I quit the game once again, renamed addon and saved varaibles folders, and restarted. Still low fps, so not an addon issue.
So, I quit the game once again, and renamed usersettings.txt, and restarted. Still low fps.
So, I tried the other toon... fps are perfectly fine.
It seems that this is per character issue unrelated to anything on the client side (i.e. addons or user settings).
I play on 2013 iMac 27", ,i7 3.5GHz, latest El Cap (not beta), 24GB ram, Nvidia GTX 780M 4GB.
EP: Veren Sailenar - 50 DK : Isabeau Sette Tyne - 50 Sorc : This-One-Lizard-Yes - 50 Templar : Lililia Adal - 50 NB : Solea Caro - 50 DK : Igor with Vigor - 50 Sorc : Slightly-Delays-Death - 50 Templar : Balki Barthel - 50 Warden : Willowshade Roxie - 50 Warden : Violetha Adal - 50 Templar : Andriel Greenarrow - 50 NB: Fleshy Leon - 50 Necro: Bonita Lacrimosa - 50 Nacro
AD: Kael Spellbinder - 50 Templar
DC: Sharrku gra-Dusku - 50 NB