Painter incredibly slow

No, just using fill layers and paint layers. Unfortunately it's an NDA project so I can't send it. I switched to 512 textures and that made the problem a little more workable. It does just seem to be this file that I've had the issue on so I can live with it. Thank you for your response.

Are you using a custom brush or a custom asset? If not, I'd like to take a look at your project, so I can maybe identify where the issue comes from. You can send it to me at cdellenbach@adobe.com

Best regards,

Thanks for the reply. Some updates:

I tried bringing in a 500k version of the mesh and reapplied my original layers as a smart material. No change. I also tried "remove unused resources" and that didn't work either.

I did find out that exporting textures is the nail in the coffin for performance. I started a fresh version of my file with no layers and started painting. Everything was smooth for awhile, but it did get laggier the longer I worked. But once I exported the textures, the problem came back: any change took several minutes to apply. My model has 8 UDIMs and I'm only exporting 4k base color textures from one texture set. I have 5 texture sets total, but I'm only working on one of them.

Hi @stephaniebellgardt,

Thanks for the question, this is an interesting topic.

Obviously, a project with many millions of polygons will have a greater impact on the performances than a project with only a few thousand, and I personally wouldn't recommend to come close to 10 millions for most of the machines. 
The number of Texture sets will also impact the performances, and as you told me the issue occurs after awhile, you could try File > Remove unused resources... then save to apply.
You'll find a lot of tips and tricks concerning performances on this page that you probably already have seen. 

My advice would be to try reimporting the mesh with lower polygon density and see if the project runs smoother. If so, we can fairly say the issue comes from the polycount.

With that being said, we know the performance is an important subject for most (all?) of the users, and this is something that frequently comes up in our discussions.

Best regards,

I should add that for this project, the issue did not start happening until after working on it awhile. I managed to paint the whole character and was planning on doing different iterations of it, and now it's gotten so slow that I can't do anything. I read somewhere that Substance can slow down once you build up too many paint strokes, but...this seems like a very fundamental flaw for a painting program and so I didn't know if that was really the issue.