My 15 kts example may have been a touch excessive but certainly at around say 2000' you could get 7 to 10 kts below desired speed. Then it's the same, add thrust FIRST and not push forward first. The whole idea is that a Jet being swept wing is quite slippery and will accelerate nicely as a result of thrust application without needed to push the nose down. Simply pushing the nose down to regain the speed will result in a deviation below path and take a lot longer to accelerate. Thrust is a much more direct way of maintaining speed without flight path deviations.
Anyway my 2 bobs worth.