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The entrypoint exported WEBKIT_DISABLE_DMABUF_RENDERER=1 for NVIDIA. WebKit reads that variable first and leaves the transport set empty, which turns accelerated compositing off, so the Device tab still lagged for NVIDIA Flatpak users, and the binary could not override it because its setenv is non-replacing. The runtime's WebKitGTK is vanilla, so there is no distro isNVIDIA() guard to clear and WEBKIT_DMABUF_RENDERER_FORCE_SHM=1 alone is the right switch: compositing stays on and only the hardware DMABUF path is skipped.