Since the question as it is written asks for speed, one of the devices mentioned above will definitely fit that bill. Especially if you are processing a large amount of citrus. Me personally, I'm not a huge fan of uni-taskers in the kitchen. Thus, I generally opt to:
- Roll the fruit in all directions while still whole. Apply a decent amount of pressure.
- Halve the fruit
- Squeeze the fruit into your container, you can use a mesh strainer to catch seeds and large amounts of pulp
- You can use this method in conjunction with a sturdy fork pressing into the fruit against the palm of your hand to extract as much juice as possible.
Mesh strainer -- http://www.amazon.com/Norpro-KRONA-Stainless-Steel-Strainer/dp/B00004RDE1
