A recent regression #813 (comment) shows that we can get jittery animations even if every frame is rendered fast. Some known causes include:

• Flutter animation framework generated a non-smooth sequence of frames (e.g., an image suddenly disappeared in one frame).
• The input event is not handled smoothly due to irregular events delivery or VSYNC and input frequency mismatch (Resample input events due to irregular events delivery or VSYNC and input frequency mismatch #41118).

It would be nice to set up a high-speed camera (i.e., some recent high-end smart phones) in our device lab, record the animations frame by frame, and compute some metrics to see how smooth transitions are during an animation.