I've got Cecil Medicine 23rd edition (193 megs), Harrison's 17th edition (166 megs), 5 Minute Medical Consult 16th edition (41megs), Current Medical Diagnosis & Treatment 48th edition (50 megs), Guyton Textbook of Medical Physiology 11th edition (19 megs), Pathophysiology of Disease: An Introduction to Clinical Medicine 5th edition (17 megs), Pathophysiology of Disease: An Introduction to Clinical Medicine 5th edition (35 megs), Nelson Textbook of Pediatrics 18th edition (219 megs) just to some of the books I've used with Kchmviewer.

There are a few of those where it might take like 2 minutes to completely load, but once it does, the app is super zippy, though there is no portrait mode.

And yeah, FBreader can't handle any of these from what I remember.

Anyway, congrats on receiving your first thanks here in this forum!

But try to earn your next one. *lol*

Peace.