Does Reddit neglect their website to drive native downloads?

Reddit is one of the biggest websites and with their simplistic content architecture and minimalistic UI, I cannot see why it is so slow.

To name a few; sluggish scrolling, freezing when going back/forward in history, random blank screens, subpar zoom-support, comments randomly not loading..

This is on a Macbook Pro with dedicated GPU running latest Firefox.

Not trying to shame someone here, I know web is complicated. But for a large company like Reddit, there should be resources to make their website smooth as butter.