The collections window... My mortal enemy. The way it works, both on desktop and big picture/Deck, is so inefficient and it really bothers me that there's no option to disable it.
Dynamically loading previews of 9 box arts, applying visual effects over them and multiplying that for every collection you've got so that it needlessly taxes your resources as much as possible -- to what end? It doesn't even make collections more legible, because it's just an indistinct bunch of box arts. I generally like Steam's interface, but this is truly baffling.
And while I'm at it, I die a little on the inside whenever I need to go to the storage management screen.
It's so bad when you tab over and it drops all the frames. The Steam Deck interface is laggy as is, just gimme some normal ass jay pegs.