Here's how to downgrade from APFS back to HFS+ / Mac OS Extended file system on your Mac such as a MacBook or an iMac.
Updating to iOS 10.3 will make your iPhone or iPad feel faster and snappier to use. Here are the two likely reason as to why this might be happening.
Announced away from all the buzz that surrounds all things WWDC, the new Apple File System (APFS) is aimed at every product Apple makes, unifying the underlying file systems that everything from the company's wearables to its high-end workstations run on.