I've read a few of his books as well, and while I haven't counted the rate feels similar (of course, depending on how fast you read).
That pace of humor is both prodigious and after excessive analysis a tad tiring. But a Swartzwelder episode isn't a thing to dissect, it's a thing to behold. It's really some of the best comedy every produced, hyperbole be damned. Just take a minor key episode like "Whacking Day"-- it manages to hit this incredibly assured series of notes. It's both completely ridiculous (a town holiday to beat snakes) and at the same time a cutting satire about how people dogmatically stick to tradition. It's completely relevant today, even though many of the younger folks watching might not know who Barry White is. And that's kind of the secret sauce-- the longevity and levity are intimately tied in a way that other comedies (or even the Simpsons of today) can't quite match.