Mines not the quickest - probably down to her bulk but she has a bit of growing to do yet! I reckon she'll make 26". But she is very athletic, hunting ability is improving weekly and she fitting in well with the others. She's very protective.
I think to get the speed up you need the most athletic out of the litters, Zac runs pretty damn quick for a big dog.. Its more of a gallop but fast enough to keep up with most. The turning can be slow but its the bulk, these dogs are never going make all out rabbiting dogs but they will do most other things (rats )and when they hit them its full steam