You're not kidding. This webapp is so fast (after the initial load) that I genuinely wouldn't be surprised if the Reddit mobile website intentionally adds sleeps/delays as some have jokingly suspected in the past. On this site, I can actually scroll through posts or collapse comment threads without wondering if my touch input and/or browser are frozen.
My understanding was that s/he was referring to the new UI. Actually Reddit makes it hard to be on the old interface, I have to use browser extension to completely avoid the new UI.