Ranked in these QuestionsQuestion Ranking
Pro Thumbnail preview very fast
Thumbnails always displayed. Daminino for example is slower - there you see first gray boxes, then the image will be loaded within half a second or a second.
Pro dark style
Pro Basic version for free
Con Doesn't read/write XMP
Con No face recognition
Con Image-Loading speed isn't great
But it's a bit faster than some others...