Apple rolled out its fourth iOS 9.3.2 beta on Tuesday, and while it may not be in its final form yet, it’s already showing some performance improvements over iOS 9.3.1 on older iPhones. See them for yourself in the speed tests below.

iAppleBytes on YouTube installed the latest beta on iPhone 4s, iPhone 5, iPhone 5s, iPhone 6, and iPhone 6s, then placed them alongside the same devices running iOS 9.3.1. All of the handsets were restored before the test using the same backup.

The performance improvements are most notable on Apple’s older devices. In the iPhone 4s test below, for instance, iOS 9.3.2 boots up slightly faster than iOS 9.3.1, and it’s faster at loading certain apps, such as Weather, Maps, and Reminders.

The difference aren’t quite so noticeable on newer devices. In the iPhone 6s test below, iOS 9.3.1 performs just as well as the newer firmware, so users who have newer iPhones probably won’t notice a change.

Of course, we should remember that iOS 9.3.2 is still in beta, so Apple still has time to make further improvements and optimizations before it rolls out to all. Either way, it doesn’t look like any iPhone will be negatively impacted by this update.