What makes it fast???
There are Norma lenses, that integrate with the Norma Automatic Shutter by means of coiled metal cables with quick disconnects. You preset the desired aperture, using the mickey mouse automatic iris Norma lensboard setup. So you're composing and viewing at full aperture with the taking f/stop dialed in. Ready to take the shot? Simply insert the film holder (up to 8x10), and the automated cables close the shutter, and the preselected aperture is set by the auto iris mechanism. Pull the dark slide and actuate the shutter using the metal coiled shutter release. Pretty quick compared to most view cameras. With the "Rapid Adapter" it's 6x6/6x9 roll film there is an automated "shutter" in the back, also integrating with the automatic shutter, no darkslides needed. Medium format cameras normally do not have perspective control or interchangeability of optics like the "construction unit" Sinars
With the twin lens you can have the slide pulled in the holder and still view and review the image close to how it appears during the actual exposure. Subject sits down, bang away with reflex continuous viewing. Not bad for a view camera.
Yes it is faster than the old fashioned way.
Richard Avedon used the 8x10 Norma in his studio for action! commercial fashion large format. The advantages at that time must have been obvious