Is my vision that bad? No, it's just a bug in Apple's Calculator

On mobile devices, Apple’s Calculator app has always been one of the most frustrating apps I’ve ever used, and I’m surprised it’s a stock app by the company itself. If you press buttons quickly, like you would a normal calculator, many of the key presses simply don’t register at all. I’m not sure if they’re prioritizing some pretty little visual animation over actual functionality, but it’s incredibly surprising from a company that focuses on user interaction, supposedly.

The lock screen is even worse. I have to slow down to input my passcode or button pushes don’t register.