Reuters
Apple's TouchID sensor lets people unlock their phone by resting a thumb or finger on the home button instead of typing in a password. And Apple's new iPhone 6S is noticeably quicker.
Here's a GIF from AppleInsider's video that shows the difference. An iPhone 6 Plus is on the left, and an iPhone 6S Plus is on the right:
The iPhone 6S takes less time to recognise your fingerprint and unlock the iPhone. That could be a combination of an upgraded home button, as well as a RAM upgrade. Teardowns of the iPhone 6S have shown that it includes 2GB of RAM, double the 1GB that the iPhone 6 shipped with.
The full AppleInsider video is here: