If you move your iPhone XR to iOS 13.2.3 and you run into trouble, note that you can no longer drop your phone back to the previous version of iOS 13.
Apple has stopped signing on iOS 13.2.2 which means you can't use a loophole to bring your iPhone XR back in an attempt to improve its performance.
If your device is really struggling, you can try moving to the iOS 13.3 beta. Just know that betas typically aren't ideal daily drivers.
If you're unfamiliar with the iOS downgrade process, take a look at our guide.
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