Improve native pdf viewer.
Often I will scroll across blank pages and it takes a long time to load the pdf pages. This is not an issue in any other pdf viewers.
François BIZET commented
Please take that feature into account. Readcube is incredibly slow on my computers compared to most pdf readers. There is huge improvements to be done here, and I'm seriously thinking of stopping my subscription just because of that. Full afternoon of readings where you regularly scroll for a specific figure or chapter can be a real pain.