Cleanest cut - Cold Saw, Power Hacksaw, Bandsaw
Fastest - Circular saws with carbide blades
What blades are you using in your jigsaw? How thick is the metal you're cutting. It could be that something as simple as choosing a different blade for your jigsaw will dramatically speed up the process.
My name is Electric Nachos. Sorry to impose, but I am the ocean.
http://www.bryanpryor.com
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)