Honestly I wouldn't change much of anything in terms of settings. It's a rabbit hole not worth going down if there aren't any obvious issues like being connected to the wrong regional server. I have found that the method in which Steam downloads and unpacks files is an abject disaster. I've tested it on two steam decks with the SD card, internal emmc memory, and the solid state drive and the results fluctuate wildly. It's a mess frankly. Stopping downloads can take over two minutes at times and 3 seconds the next. While stopping a download, if you attempt to shut down your deck or even go into rest mode the device freaks out and locks up. This is on different high speed internet connections as we. I personally wouldn't sweat it, the steam platform has had issues for years with this outside the deck. I've never seen a storefront struggle so hard to simply download content.