WowAce

I have spikes using this addon after patch 8.3.7

I am experiencing this as well. Opening character info, Mount, and Appearance page freeze WoW for about 10-15 seconds. 

Turned all add ons off and went through 1 by 1 and it was SUF. There have been posts about this being a recurring issue for years. Can you please update the addon? I look every day for an update since 8.3.7

Having the same issue, it seemed random on when it will happen, but always get it in certain places in daz'aralor, like around the top of the pyramid and next the dock. Had to disable to make the game playable again.

I am having the same problem with game freezing up.  It usually happens when I enter a zone that has a lot of players in it.  Game would lock up, screen would go black for at least a few seconds, game would minimize and a few times crash.  

After days of hardware trouble shooting (finally got tired of game doing that, even after lowering graphic settings to 1)  because I thought it might be my GPU or another hardware issue I thought about disabling all my addons.  Thankfully for my sanity, that fixed it.  Ended up enabling one at a time until I found SUF to be the culprit.  It is a real shame since I have been using this addon for years and years and love it.  One of my favorite addons, but it makes the game unplayable with it turned on. 

Hopefully there is a fix for it! :)