Customization/options for best/quickest performance

this is for folders with large # of jpg, etc. Just need to manipulate files, etc...no need for image preview and so forth.

Thanks,
Reynold

This FAQ will probably help:

[Folder Formats: Quick Guide)

If you don't want the view mode to change automatically when entering a folder with lots of Jpegs you should disable the Content-Type Detection system, which the FAQ should explain (and lots more).