I’ve had the same issue with きみの名は. Having not seen the movie, I’m now finding myself flying through pages as the story has reached its climax. I was pretty good at controlling myself for the first half of the book as it was really useful for me to read a little slower, take the time to add words I don’t know to Anki, etc.
But for the last few chunks of reading, I’ve flown through in 30 minutes or less - and while I’m absolutely comprehending the plot, I am undoubtedly missing subtle details, new words/nuances to learn, etc.
The only reason I haven’t flown through and finished the entire book is that I’m currently reading two other books at the same time, and working full-time, and trying to squeeze in some more advanced grammar study/SRS/etc.
I’m going to try to take it a little slower with the next book as well.