Filter animation time step?

Would be nice to draw the times things are really drawn, there is probably some smoothing to do that would make it draw smoother, because the time we get is the one of WM_TIME for example, and that isn't the one we will display the image next.

- [ ] Trace moments of actual drawing in graphics.d (when WM_PAINT request something). What are their jitter?

Start in graphics.d and trace the WM_PAINT path where drawing is requested. Record the moments of actual drawing, measure their jitter against the available timing, and document whether smoothing is needed and what behavior would count as done.

Written by the indexing model from the issue text.