I suggest you try scaling the 4K pics to something around 500 on the long edge (or something more if you see blurryness)
As far as the Pi4 is concerned, did you run AF on that? Wondering how it will run...
As for the AM+ binaries, you can download them only if you are logged in to Github, you can create an account and if you have issues please let me know
I will definitely try lowering the resolution on the images. I also upped the attract mode cache size to a few gigabytes. I do notice when I change the columns from 2 to 3 the response is smoother. I also can't decide if I like 2 columns or 3. They both look great!
I do not have arcade flow for running on the pi yet, but I do have attract mode running in retropie on my other arcade cabinet. In the future, I will definitely share my progress on that as well testing Arace Flow!
Thank you for the suggestion on github, I do have an account, I will try to login and download it there. I was looking at the documentation and I can't find any information on what is different from the mainline attract mode.
Again, this theme is so awesome. With your recent updates in this beta, it is a dream come true for this new vertical arcade style. Here is another image of the beta running. Sorry about the low image quality but the forum limits the file size.