Hi id_866 ! Welcome to the Windows 7 Forums website.
The green bar you're referring to is the indexing service searching the folder. It shouldn't take two minutes for that to search unless you have a ton of files and folders in the area. If you enable "Write caching" on the respective hard drives that should speed things up for you.
Once you change the way you want your files to be arranged in the folder, in the upper-left of the menu bar is an "Organize" drop-down menu. Click on that and then select "Folder and search options" Click on that and then click on the "View" tab. Select "Apply To Folders" button and click on that.
Once you've done that, all folders that have similar files such as jpegs, png, gif, etc., will be set to the arrange options you selected.