https://www.gamingonlinux.com/2025/06/valve-fix-lag-and-freezing-in-games-with-the-steam-overlay-disabled/

Fixed periodic gameplay lag and freezing in games using Vulkan rendering when running with Steam Overlay disabled.

No technical deets as to the why it happened, but it did happen. And I didn't even mention it in my big linux post a bit ago because, well, I turned on overlay and DRG stopped going to slide-show after ~40 minutes (yeah testing fixes and tweaks for that was just a time sink) and forgot all about it like one do when things work.

This is in the beta branch, presumably coming to the stable in soons.