On my personal Teddit instance, pages load approximately eight times faster than on reddit.com! There are also some nice UX features, such as being able to see the entire nested threads (like here on Hacker News) without expanding them individually.
I tried Libreddit as an alternative, which is much faster, but I prefer the look/feel of Teddit.
vs new or vs old? New is dog-slow IME, old is faster.