I wish I could get my Nexstar to hover!!!! You must have the 3D model.
I dont have any problems with mine. If you mean when you are first taking off it seems slow then i guess it does until the climb to desired altitude. Speed brakes dont allow it to accelerate quickly. Once your at level flight it moves along nicely. Remember this is a trainer not a sport plane, its not designed to do 0-60 in 2 seconds.