While watching the anime, Part 4 felt drawn out for me, but the pacing seems better in manga, glad I read it.
Jotaro's thesis made me notice a pattern. He's from the Joe
star family, his stand is
Star Platinum, and he was researching
starfish. Which continues into Part 5
with Giorno wanting to become a Gang-Star.
And thanks to
@Mandra174 the meme man for occasionally making me smile while reading this part