Normal. Things need to warm up just like the engine. The PDK is not a regular automatic tranny like most are used to. There is no spinning torque converter that makes the car launch off the line at the slightest amount of throttle like a regular auto does.
It's essentially a manual transmission, but with a computer making the shifts for you. There will some slight "slip" off the line just as there would be if you were moving off with a regular clutch release in a manual. This will be there all the time to some extent even when warm, and you may notice a delay if you accelerate suddenly from a dead stop for any reason. It's worse when things are cold, and it can feel a little clunky until things are fully up to temp
It's essentially a manual transmission, but with a computer making the shifts for you. There will some slight "slip" off the line just as there would be if you were moving off with a regular clutch release in a manual. This will be there all the time to some extent even when warm, and you may notice a delay if you accelerate suddenly from a dead stop for any reason. It's worse when things are cold, and it can feel a little clunky until things are fully up to temp