Are you sure? I've been playing since beta and I don't ever remember it dragging like this...
First charge is for supercruise.
Second is hyperjump.
Third is to supercruise
Fourth is hyperjump from supercruise.
https://youtu.be/hamW38VSI8YNow, I would notice it take that long if I was mass-locked by a ship, but as soon as I got out of their influence it would speed up. I have a bug report up on the FD forum as well as a ticket in. So far they don't seem to think it's normal, but that was before I posted the video, so we'll see. I would be shocked if I was told I'd been experiencing a beneficial bug for the past 2 years.
EDIT: Yeah, after watching some YouTube videos... looks like I've been benefitting from some sort of bug because I know it wasn't taking the full 15 seconds to charge for a system jump. Oh well... guess I'll have to get used to it.