Kraven

Hello. I hope I’ve posted this in the right place. I’m looking for some advice on why my octavia 1.6tdi 4x4 is so much slower than my friend’s car of the same model and age. At first I thought it was just because it was a 1.6 tdi (I’m used to 1.9/2.0 tdi’s) but since being driven in my friend’s car of the same model it’s painfully obvious that the acceleration from standing and at any speed is considerably slower than my friend’s car. The car has done just over 100k miles and is otherwise in good condition and drives smoothly. It’s just slow. What would be the most likely parts to consider as a cause of this? I thought maybe it could be an issue with the turbo. My friend suggests the injectors but the car seems to idle at a consistent note and no black smoke to be seen out the exhaust. No judders or obvious misfiring. No sudden drop in power through the Rev range. Just a consistent slow acceleration regardless of how heavy I am with the throttle. It takes a long time from depressing the accelerator pedal before it responds and when it does, the speed of acceleration is way slower than I’d expect. Any help much appreciated.