Windows 10 Photo Viewer is a built-in image viewer program in Windows 10 operating system. It comes preinstalled in Windows 10. However, many Windows 10 users complain that it takes too much time in opening images/photos. How to view and edit photos/images quickly with the built-in Photo Viewer on Windows 10? Fortunately, Photo Viewer Booster software can fix the issue. You just need to click "Boost" button and then the photo viewer can load images in fast speed.