Passiflora cutting

Hi
I wonder if anyone can provide a bit of advice.
I took a cutting from a passiflora back in October (I know the wrong time but we sold our house and so we had no choice but to take it then). Most died with the exception of a couple.
The ones that survived were the ones that were rooted in water to begin before being transferred to a compost pearlite mix in a large pot just in mid/late November to make sure that I didn't need to upset it again re-potting it later on. We are now 6 months on and over this time the cuttings have grown approximately 15 centimetres on average with new growth looking healthy and leaves steadily growing and developing.
The plant is kept out of direct sunlight in a warm bedroom where the temperature stays at around 15-20*c and lightly watered a couple of times a week when the top soil begins to look dry.
My question really is I assumed passiflora was a fast growing plant whilst looking well am I doing something wrong??
Any advice or recommendations would be appreciated.
Thanks
Posts
It is a very fast growing plant, but to grow fast it needs a very good sturdy root system, that doesn't happen in the first year. Be patient, pot on only when the roots fill the pots.
If you were to buy one from a garden centre, it would be at least two years old.
I see. At the point where we potted it the very early roots seemed healthy so I guess it's just a waiting game as the root structure develops which it will be doing as well as growing new leaves.
Many thanks
That's right, don't feed it, just re pot as necessary.