Although I do like the design of the website, I'm really frustrated by the fact that 1) it took a couple moments to load because it's a pretty big page, and 2)

Although I do like the design of the website, I'm really frustrated by the fact that 1) it took a couple moments to load because it's a pretty big page, and 2) it hijacks the history and means I couldn't just press back, I had to press back 6-7 times after I finished scrolling. It seemed to load really slow and even scrolling took a while. Why can't it just be a simple page with some JS/CS to see if you've entered a specific section of the page and change the class on the title of the section in the index on the left?