The million dollar question.
It's not quick. It is let down by a bloody infuriating gearbox - or, to be more precise, the programming/mapping on the gearbox - and a throttle pedal that is as quick to react as a sloth who has OD'd on sleeping pills. It's never in the right gear and it takes too long to change down. Doesn't help that it is a 7-speed box so you invariably need it to change down 2 or 3 gears instead of the 1 or 2 that you would in a 'normal' 6-speed box. Sport mode is pretty much unusable around town unless you like driving round in a low gear and everyone staring at you for the resultant noise (although you can partly solve that by using the 'custom' mode and turning the noise generator off). On the other hand, sport mode is the only one that has an even remotely responsive throttle... it's a shame the 'drive' component of the 'custom' mode controls both the gearbox and throttle response - if you could change them independently then it would be a whole lot better.
Having said all of that, learn the gears, hit 'sport' and shove the 'box into semi-auto, then point it at a typical UK B-road... and it can make very rapid progress, and for what it is (a big lump, not a sports car), it's a pretty decent drive and can be good fun. I've no idea what the power curve actually looks like, but keep the needle up above 3k-3.5k revs and it's responsive enough. Overtaking with a full load doesn't require a second thought (don't be stupid though), and if you keep the engine purring at the higher revs, you can end up going faster than you realise pretty darn quickly... but that's the biggest problem that I think most (if not all) large SUVs suffer from, they just don't have that sensation of speed because you're high up off the road.
If you need something big enough to fit your family, dog, and enough crap (sorry, luggage) for a couple of weeks in the south of France, and still have a bit of fun now and then, I've yet to see something that offers the same package for less money. I love mine, and don't regret getting it at all. If I end up keeping it past the end of the PCP (I probably won't, just because I like new cars), then I'd look at tuning it (it's the venerable old Golf GTI lump so there are plenty of options) 😎.
(Edit: tl;dr - not quick, but fun (and practical) nonetheless).