What's fastest: iPhone 4 tethering with bluetooth, usb or the new hotspot feature? I'm going to use the internet on a MacBook 5,2 and I have an iPhone 4 with iOS 4.3.1 and it's jailbroken (and using TetherMe), if it makes any differences.
Fastest to slowest:


USB
WiFi hotspot
Bluetooth


Keep in mind the power draw of the options. From most battery efficient to least:


USB (It helps that it's also charging at the same time.)
Bluetooth
WiFi