And they made it so smooth, too - just replace www with old! Considering, too, their incredible API, I have a lot of respect for the Reddit developers.
You can change the subdomain to "i" on any reddit page, or access the same version by adding ".compact" to the end of the regular URL (which can be more convenient, thanks to the ".com" button on mobile keyboards): https://www.reddit.com/.compact, https://www.reddit.com/r/CatsStandingUp/comments/7bcm79/cat/..., etc