Not talking theory here, but real live experience. My experience with remote needles goes way back before they were standard issue, with several makes of engines, and several makes (and types) of needle valves.
Though perceptions may vary, the fact is fluid dynamics do not change, and we are talking flow here, not like when you adjust your hot/cold ratio in the shower, and it "takes awhile".
Perhaps the reason you percieved it to take awhile when using a remote is this: thread pitch on reg. valve is different from the thread pitch on the remote needle valve.

Jetts