@jameswhiteman HI, this feature should be already available in the latest app.

Still seeing this bug as originally reported. I've recently noticed that the incorrect particle animation shown at high zoom levels looks like the particle animation for a much more zoomed out view (higher degree of variation in direction than one would expect for the zoom level)... Looks like there could be a bug that is causing the browser to render the particle animation overlay for a different tile to the one of the current map view (and a less zoomed in view).