The site looks and performs fine to me with the redesign. The problems I have with it are the obnoxious "open in app!" Pop-up and the subreddit preview that interrupts the comment section... Totally unacceptable.
It literally does not work on my laptop: it stutters all the time when scrolling, navigating, etc. It's unusable even with the greatest degree of patience. This happens in both Chrome and Firefox, both with the default settings (uBlock improves things slightly, but not by much). I genuinely thought there must be something wrong with my setup, but several of my friends have reported similar experiences across different platforms.
Granted, I have a cheap not very fast laptop, but it's less than a year old and almost everything else works just fine – certainly not as horrendously slow as Reddit. These problems seem to disappear if you gave a faster machine from what I've been told.
But, yeah; it's broken for millions of people who have low-end to medium hardware. I genuinely don't understand how they could ship something so dysfunctional for so many people.