Unlike any internal-combustion-engined cars, Tesla keeps adding features to the Model S and Model X through magical software updates. The latest change, only applied to the top-of-the-line P100D Ludicrous versions, have made the world’s fastest production car even faster.

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In a tweet, Musk revealed that the acceleration of the P100D has been improved so that it can break its own records. The Model S P100D with Ludicrous battery option will now do 0-60 in 2.4 seconds, and a quarter-mile in 10.6 seconds.

That’s only a small improvement on the previous numbers, 2.5-second 0-60 and a 10.76 quarter-mile. But when we’re talking about smashing a significant record via an over-the-air software update, a tenth of a second is still pretty neat.

The numbers are also set to improve on the Model X, which will continue to be the world’s most unnecessarily fast SUV:

There’s only one catch for owners: the speed improvement will be unlocked via an Easter Egg in the software update, rather than being by default. Elon Musk has a history of messing with people who’ve paid him $150,000 for a car, and this time seems to be no different.

Chris Mills has loved tinkering with technology ever since he worked out how to defeat the parental controls on his parents' internet. He's blogged his way through Apple events and SpaceX launches ever since, and still keeps a bizarre fondness for the Palm Pre.