Lol your amazement actually made me laugh for some reason.
It's possible that there's also some confounding regarding how I'm going through it. Now that I'm nearing my exam and I've seen a lot of the material before, I'm spending a bit of time trying to memorize all of the small details in the QBank that I'm hoping most other people just didn't care to write down. I also click into the articles (the ones after the explanations) sometimes. And when I annotate, I tend to spend a little time reviewing the corresponding FA pages as well. It definitely slows things down. I think knowing all of the small detail from UWorld (e.g. HMWH has >18 pentasaccharidic units) has very diminishing returns, but I'm hoping that maybe it gets me just one extra question correct on my exam.
This is about the pace I had gone through USMLE Rx back in March-April.
However I was able to get through Kaplan, during August, at double the Rx/UWorld speed for some reason.