https://wccftech.com/iphone-xr-beats-iphone-12-and-iphone-11-in-speed-test-performance-throttled-after-ios-14-5-1-update/

If you are a proud owner of the iPhone 11 or iPhone 12 series and have updated to the latest iOS 14.5.1, you could possibly be experiencing performance throttling. Numerous iPhone owners are reporting performance issues after updating to Apple's latest software update. The performance throttling seems to be persistent due to unknown reasons and tests show lower than usual benchmark scores.

YouTuber Nick Ackerman shared a video in which he highlights the performance issue on iPhones. The speed test was conducted using the iPhone XR, iPhone 11, and iPhone 12. Surprisingly, the iPhone XR showed better performance compared to the iPhone 11's A13 Bionic chip. Moreover, the video rendering was faster on the iPhone XR compared to the iPhone 11. Not just this, the iPhone XR was faster in terms of app load time and better benchmarks as well. The performance issue seems to exist on Apple's iPhone 11 and iPhone 12 models running iOS 14.5.1.