This, for me, seems to have been happening since Necrom was released.
I'm running a Retina 5K 27" 2020 iMac (Intel) with AMD Radeon Pro 5500 XT 8GB graphics. My Graphics Quality in game is usually set to 'High'.
Prior to the Necrom release, the performance during sustained periods of play in combat (dungeons, arenas, etc) was pretty consistent.
Now, as I get deeper into combat play (which makes the performance degredation quicker) or have the client running for a long time, the performance continually seems to decrease to the point where my FPS gets below 10, making combat a lot more challenging.
Ultimately, it gets to the point where I need to quit the client and restart.
I'm not sure if this is something that other people have experienced, or if this is something that is specific to my environment.
Looking to get some advice here, or how to collect appropriate information so that this might be addressed by ZOS. (hence, why I'm posting in Bug Reports)
Thx.