Scrolling on this forum uses 60% of my CPU

I have an i7-3770K. I don’t why, but when I middle click and move the mouse slightly down so the page (extremely slowly) scrolls down the browser goes from 1-5% CPU usage to about 30% CPU usage.

Try using firefox. I decided to test it out myself and on my i7-4770 using Vivaldi (chrome) uses about 20%, Firefox uses 2%.