Preview Pane speed
Under a Windows 10 environment, when navigating a folder with the Preview Pane enabled, the time for the preview pane to populate is greatly increased. Under Windows 7, the preview pane was immediate and crisp. Windows 10, however, the preview pane takes (literally) over a full second to populate, during which time you also cannot click or down arrow to the next file until it displays. I've duplicated this issue on multiple PC's. The thumbnails show immediately, but the preview pane seems to have to actually load each file--every time. Even bouncing back and forth between two files takes over a full second each time.
As someone who uses the preview pane daily, and has to navigate through multiple PDFs--my workflow has slowed down tremendously as a result.
Please speed up the preview pane processing/display process. There's no reason why it should be this much slower than it was on Windows 7. Other file types preview as quick or quicker, so it's not a Windows issue, but rather an issue with the Reader.