All indoor courts I've played are slower than the outdoor asphalt that makes up most outdoor courts here in NY. I've played one outdoor court that was a bit slower because the surface had been left more "rough" than other asphalt courts.
Indoors, it's all deco-turf, nova-cushion, or har-tru around here. They are all slower than asphalt. Deco-turf, which is used at the US Open and is described as "hard" court, is significantly slower than the average "hard" tennis court at a high school or park. Not all hard courts are the same.