@DanMan have you tried proton experimental to see if it behaves better than proton 11 on your end? If it doesn't, can you give more info about your setup? as I don't really notice a notable difference between proton 10 and 11 but maybe you need to be farther into the game. Do you have the game installed on your micro sd? how are you measuring the load time? I ask because when you switch between proton versions you'll often end up with the prefix being remade or updating, so it's best to only count for second launches, and in my case from play to the game's logos it took roughly 15 seconds, but it's possible your counting elsewhere as well.
I didn't find any places where I fell, or where progressing through the map did more than just cause stutters, so having save file close to a troublesome spot would be helpful, or at least pointing out a place in the game where it happens (through a walkthrough, for example)
proton experimentalx1 2026-07
System Information
I confirm:
There seems to be a regression with Proton 11 which leads to dramatically increased loading times (like >3x). Both when launching the game and ingame when it's streaming in parts of the level. The latter sometimes don't load in time, so you can fall off the map. Works normally with Proton 10, which is the recommended default version, if you don't override it - for good reason apparently. Just a heads up.