Nigel Warren:

There’s a common theme running through all these improvements: speed. Maps have to be accurate, yes, and by most accounts Apple has their work cut out for them in that area. But as I found out when I was testing Google Maps back in the bad old days of flip phones, speed can make or break a mapping app just as effectively as bad data, and any improvement in that area is welcome.

This applies to all user interactions. Speed — both how streamlined and interruption-free the user interface is, and how fast the application performs — can be the difference between an awesome user experience, and a horrible one.

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Want to read more like this? Buy my book's second edition! Designed for Use: Create Usable Interfaces for Applications and the Web is now available DRM-free directly from The Pragmatic Programmers. Or you can get it on Amazon, where it's also available in Chinese and Japanese.