I usually charge my iPad Pro 10.5 inch with the USB-C to lightning cable from Apple using a 60W Anker PowerPort+ 5 Ports USB-C wall adapter. I didn't measure the charging times but it clearly seemed like it could charge the iPad up to 2/3 capacity within an hour. Now, this clearly isn't the case anymore at all whatsoever after upgrading it to iOS 11 GM (which should be identical to the final version). In fact it seems like it has activated some sort of ultra slow charging mode instead. I've plugged it in for almost half an hour now and it charged from 38% to 39%!!! Unless it's showing me the wrong percentage, something's got to be seriously wrong here.