Yup, screen cast please. You can see the jumping on webpagetest.org: https://www.webpagetest.org/video/compare.php?tests=180616_BQ_41c2864f929eb6fc7c12ce33937

Yup, screen cast please. You can see the jumping on webpagetest.org: https://www.webpagetest.org/video/compare.php?tests=180616_BQ_41c2864f929eb6fc7c12ce33937dd5fe-r:1-c:0 https://www.webpagetest.org/video/compare.php?tests=180616_B... With a slow connection, on the initial load the first jump happens at 6s and another one at 8.5s. When I click on one of the links, it happens much faster because everything is cached. But I can still see the jump everytime I click a link to a new section in the tutorial. I don't think the type of browser plays a role here. I get the glitches on Chrome and Firefox. And testing it on browserling.com shows that they also happen on Internet Explorer.