Initially I tested on osd github without maximizing the canvas, and that is when I got a feeling that it is "framing" only until new tiles are loaded. When I tested the sv-overlay demo and altert demo, I did not hit full screen, but the canvas in the demo are maximized already, so the comparison was not fair. Now when I am testing the osd github demo I also have the "framing" on the full screen even after all the tiles are loaded. I recorded a video with my phone to show what is going on, but it is useless, because the video frame rate is too low, it looks like the animation is "framing" all the time :). This happens both on MacOS Chrome and Firfox, and Safari. I am surprised because it has 8GB of RAM. Surprising is that sometimes it gets smooth without opening/ closing browser tabs or applications. I tested this on another PC and all demos are smooth. It has to be the issue with the machine!