I can't seem to make sense of this other than with "exponential=a lot".
Unless the book has more words than atoms in the universe a few dozen chapters in.
What I meant was not the 'amount' but the time it needs for everything to progress. I should've make it clearer. Some wasted a big chunk of their book by obsessing on the introduction part, but everything flopped after that. The conflict is not developed enough to get that 'omph' in the climax. I guess some consider this necessary to build everything, but it's just too much for me.
Like a certain book I dropped where its prologue+chapter 1 is 30k words, yet other chapters are just around 4k each. Considering its full book is only 100k words, how do you even justify that much first two chapters?