I’ve also just run into this - what is the aspect ration suggested for category logos in 2023? Can it be specified under (one of) the image placeholders?
There are no recommended dimensions, but I believe these pictures don’t use thumbnails even if they are displayed as small, so it’s best to avoid large/heavy images in any case.
To solve the problem with the correct display of images and their optimal loading, maybe it is worth adding the functionality of scaling, cropping and positioning category images to the roadmap?
a width of 350px used to be my go to, it looks great on mobile devices. I’ve found the new sidebar makes 350px too wide on screens under 12.5 inches if you’re using box categories.
I’m now using 300px width, but its not perfect on either small screens or mobile. I’d also love if there was image size guidance and auto-align/resize.