FlatPress

Just saw this come up - PDF-XChange Viewer - which is small, lightweight, fast and portable. Having played with it, it is now quite a bit faster than my old favourite (Foxit) so has replaced it. Sure its funding model is based around getting you to purchase the “pro” version which has a variety of features. But if all you want is fast and, well, fast, getting you viewing quicker and easier, then look no further