Despite being a point release, iOS 10.2 comes with a number of new features and changes. As we have seen with the release of any major new iOS release, a speed test comparison follows with the latest released version and the older version to see how it affects performance, especially on older devices.
YouTuber iAppleBytes has done a similar speed test between iOS 10.1.1 and iOS 10.2 starting from the iPhone 5 to the iPhone 6s. When it comes to boot times, iOS 10.2 on the iPhone 5 boots slightly faster than it does on the handset while running iOS 10.1.1. In applications and general browsing, the iOS 10.2 running iPhone 5 was slightly faster, but the difference is barely noticeable.
We see a similar story in speed tests conducted on the iPhone 6 and iPhone 6s, though the latest version of the iOS does take slightly longer to boot on the iPhone 5s for some reason. In applications and benchmarks, iOS 10.2 manages to edge out iOS 10.1.1 in most of the scenarios.
Considering that iOS 10.2 is the last major update to iOS at least until March next year, it looks like Apple has done a great job optimising its performance.
You can find out all the new changes in iOS 10.2 here.