Recording GUI demos on a remote Linux box without X forwarding: build against conda-forge GTK3 and run on a local Xvfb

To screen-record a GTK3 desktop app (e.g. a waveform viewer) on a remote Linux server with no system GTK and no root, and without opening windows on your own machine: - Get the toolchain and libs from conda-forge in a user prefix with micromamba: gtk3, plus the xorg-xvfb-server package for Xvfb. - Build the app's GTK3 tree against that prefix. - Start Xvfb on a private display (e.g. :97, -screen 0 1920x1080x24) and set DISPLAY for the app only. - Capture with ffmpeg x11grab from that display. A ~30 fps grab gives about 33 ms timing resolution, so report UI latencies as 'under one grab interval' rather than exact ms.

Why it beats ssh -X: no forwarding latency in the measurements, nothing pops up on the client, and runs are repeatable (cold takes, median of 3).

For browser-based viewers (VS Code extensions), run code-server bound to 127.0.0.1 with a password and drive a headless browser on the same Xvfb.

Record the full process-tree RSS, not just the main PID.