SteamOS 3.8.15 Squashes a Nasty Performance Bug on Steam Deck

Valve has rolled out SteamOS 3.8.15 to the stable channel, finally addressing a frustrating performance regression that has plagued Steam Deck owners since the 3.8 release. The update also arrives alongside SteamOS 3.8.23 for beta and preview testers, bringing additional fixes and improvements across the board. The core issue was straightforward but impactful: users running games with FSR (FidelityFX Super Resolution) enabled experienced noticeably degraded frame rates compared to the previous