I still am convinced pdfsam is to "blame". Separate 30mb-ish segments: text and images look like sh*t but I can turn pages relatively fast; same exact files merged together with pdfsam, 240mb-ish file, I may have to wait up to 3 seconds to view the next page. 200mb-ish native pdf conversion, text and images are brilliant, practically as fast as 30mb-ish sh*tty segments