I copy-pasted the HTML source for the review in a new file and it's 20kb. So if it was a full review it would be a 360kb file. Uncompressed, unlike epub files. Once compressed it is ~6kb. 6kb*18 = 108kb. I wouldn't read a book review that is 1/5th of the original material or I wouldn't call it a book review but I digress.
Anyway, should we include the e-reader's viewer code to know how much information is used to display the book and compare it to the CMS's code or the code of the full page of the review to compare... what ?