The new Wi-Fi syncing capability for the iPhone and iPad is convenient, but it also can be much slower than using the USB cable to sync. If you have begun the syncing process over Wi-Fi and discover it’s taking too long, you can speed things up a bit by plugging your iPhone/iPad into the computer without stopping the sync. That’s right, there’s no need to stop the syncing process, just plug in your device and the sync will continue to chug along without starting over.
However, please note that the reverse is not true, meaning, you can’t start a sync using the USB cable, unplug the iPhone in mid sync, and continue over Wi-Fi. Doing so will end the sync.
