If you're on Win10, the Xodo PDF app is the best/fastest - and it allows editing and page order changes. And it's free. And it's a dream to use on a touch scre

If you're on Win10, the Xodo PDF app is the best/fastest - and it allows editing and page order changes. And it's free. And it's a dream to use on a touch screen. Trying to open the same high quality/density PDFs in Adobe (even just the reader) is an unresponsive nightmare. I don't even understand how there can be such a significant difference in performance when Adobe created the format....