We’d like to ask you for a brief moment to put aside thoughts of speed, grip, and power. Also, try not to think about heritage, beauty, or price. Before we get to that, we’d like you to consider how tremendously good the Porsche 911 Turbo Cabriolet (992) is when it’s going slow. Whether it’s urban cruising, suburban errands, or an uninspired back-roads tour, this is the best seriously fast car there is, when velocities sink to a crawl.

When tasked with slowness, Ferraris and Lamborghinis champ at the bit, making their discomfort with your pace profoundly known by barks and fire breathing. Bentleys can manage easygoing pretty well, especially if you’re passionate about interior fit and finish. And then there’s the 911 Turbo S cabriolet, a rocket that’s utterly relaxed in the right lane. The interior is attractive, and welcoming but not overloaded, crafted with care down to the last stitch on the leather-wrapped instrument panel. Especially in our own example, in which the white dashboard makes a great contrast with the black exterior.

Of course, with 572 horsepower on tap from its twin-turbocharged 3.7-litre flat-six, the 911 Turbo cabriolet is always ready for you to call a raid. This Porsche will propel itself to 60 mph in a mind-warping 2.9 seconds, one of the quickest times ever recorded in a convertible, and it won’t stop until it hits a claimed 199 mph, presumably with the top up. Having also the optional ceramic composite brakes, our car will come brutally to a stop at any speed. But most of the time, for most drivers, what matters is that this car does low-speed better than all other high-speed ones, and that’s what makes for a great and useable daily driver.

All that mechanical goodness is embedded in a structurally unshakeable if roofless, aluminium-intensive unibody. It’s more than just aluminium and steel, though; the Cabriolet also has its share of magnesium, all placed where it makes the most sense.

Now, forget about slow. This thing is a beast when it is allowed to be. Put it in Sport or Sport Plus modes, and the whole mood and countenance of the car changes. In Sport Plus, the front spoiler drops down, the rear spoiler lifts up to aid in stability, and the optional Sport exhaust (which our car has) snarls and hisses at up to 92 decibels. Employing its launch-control system, the cabriolet is but a tenth of a second slower than the coupe, annihilating 100 mph and quarter-mile times. Hard take-offs can feel like the car is ripping beyond the speed of light and going backwards in time. Do it enough times, and the surge of endorphins might even make you look younger. Wait, isn’t that why some people buy these things?