Repeated pressing cursor down or up key doesn't always scroll the page

I often use cursor down or up when scrolling websites. I have noticed, since day one, in each Edge version, that the key press doesn't seem to register each time. Sometimes I can press cursor down on my keyboard each 0.5 second and scroll nicely through a very long site, but sometimes it's as if only a second or third keypress is being registered as a scroll down.

Here's a video showing how it often looks like: https://i.imgur.com/7fLjg0P.mp4

In the video I press the "cursor down" key in regular intervals but the browser ignores some of the keypresses. Issue occurs on all tested PCs (3), no matter the Edge version.