On native Wayland we set __NV_DISABLE_EXPLICIT_SYNC=1 for every NVIDIA user, to stop the "Error 71" protocol crash seen on driver 615 with WebKitGTK 2.52. On driver 620.70.06 with WebKitGTK 2.54.2 (same RTX 3070) the app launches and runs smoothly without it, while the default was reported as extremely laggy. Skip the flag only when both versions are known and new enough. An older driver, an older WebKitGTK (e.g. the AppImage's bundled one) or a version we can't read keeps the old behaviour, since a wrong guess means the app doesn't open. Setting the variable by hand still forces it. The app logs which path it took on stderr. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA