Fix for Proton/Linux slow loadtime for some games

Proton is a compatibility layer for Windows games to run on Linux. Running a Windows games is mostly just hitting the Play button within Steam. It’s that good that many games now run faster on Linux than on native Windows. That’s what makes the Steam Deck the best gaming handheld of the moment. But a compatibility layer is still a layer, so you may encounter … incompatibilities. Ember Knights is a lovely game with fun co-op multiplayer support. It runs perfectly on the (Linux-based) Steam Deck, but on my Ubuntu laptop I encountered long loading times (startup was 5 minutes and loading between worlds was slow). But once the game was loaded it ran fine. ...