Sorry the experience has been sub-par. What browser and OS are you using? It works best on Chrome and Safari and the scrolling is typically smooth in those environments.
Now since these videos are user generated they are all recorded with various levels of quality. If your mouse moving through ones that are poorly recorded that split second of playback sounds horrible.
You can simulate the effect if you visit https://giveit100.com/@Benjamin and goto the day 18. If your move your mouse past it you'll hear some really bad static for a split second. Now imagine if all the videos are like that while scrolling down the page, it's a pretty horrible experience.