I've not tried yet with the latest patches, but I noticed at around patch 6 that I had extremely poor performance using DirectX 11 but much better with Vulkan. I think I'd played using DirectX 11 in an earlier patch and it was fine.
I also was seeing extremely (many minutes) long loading times with patch 6, despite having an SSD. My system at that time was better than the minimum recommended in most respects, but I only had 8GB of RAM. I added more RAM which did improve the loading times, but not the performance with DirectX 11. May not be relevant to your system but thought I'd mention just in case.
(My only theory about the DirectX 11 problem with my system so far is that it was something to do with Windows 11, but one of these days I hope I can work it out. It's fine now with BG3 as Vulkan is available, but I was quite enjoying playing Solasta and that became unplayably slow about half way through. I've not seen problems with any other games, but I've not played many recently.)