the images there. to not show the preview column, sometimes that gets in the way and you just want to have the final column being the list of files there and not to load every single preview for everything especially if you are looking through a folder with very large documents. its got to load the preview for each one. sometimes it could be useful to turn that off.
you can also, if you notice, go into and check off always open column view and browse in column view if you like column view like i do and you want to see this basically be the default.
so if you use the 