Fastest way to transfer information from my old MacBook Pro to a new one?

Question

What is fastest way to transfer data between MacBook pros? It takes forever on wi-if.

Answer 1

Sometimes the fastest way would be just to transfer only your files via a external hard drive via drag and drop methods into the same named accounts on the new machine. This is especially useful if you want to avoid corruption of the old machine and have a chance to clean house of older files.
By the time one fiddles around finding a Firewire cable and adpaters, a standard USB 3 external hard drive could be done already and be gotten at any local computer or office store.
Also Retina's have SSD's and any data on them is not scrubbable like hard drives can be. Scrubbing SSD's would involve the entire drive being filled and this would wear them out prematurely as they have limited writes to each sector.
If you want to use Migration or Setup Assistant, there is some element of risk involved because your copying the corruption over from the previous machine if it exists. If you know the previous software is fine on the older machine, then you can use Carbon Copy Cloner to clone the whole OS X boot parititon to the external USB drive, then hook this up to the new machine and run Migration/Setup Assistant against it, just like you would in Firewire Target Disk Mode if you don't want to wait to get a Thunderbolt to Firewire adpater from Apple.
If you already have the Thunderbolt to Firewire adapter and a cable/adpater to the old Mac, then that's the fastest way.