Pia's log shows the lift arriving 200-300 ms after the last move on every swipe, so the release looked like a resting finger and nothing glided. The vendored winit now keeps the Wayland timestamp of each touch event (take_touch_time), and the fling measures with those times instead of when the app got around to handling the events. The diagnostics log both gaps and any event handling that blocks the app for more than 40 ms. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>