Introducing myself to Robert Heinlein via The Cat Who Walks through Walls. He has an odd writing cadence.
I've read a lot of Heinlein, but I've never read that one. It's almost universally considered one of his worst. There's not much Heinlein after 1960 or so that's worth reading, imho.
Yes, it's...slow-going. I left it for Asimov's The Currents of Space, which was a much tastier read.