TVAD I don't know why I softballed your question, when you said, "I don't know what slow means" or words to that effect.
For many years now, rise time, slew rate, have become lesser talked about figures in some circles than in others.
I think the now deceased John Ivorsen of Eagle, was the first designer to talk to me about the speed and relative speed of amplifiers, and how capacitive loads dramatically effect the measurements: which is why different engineers have different measurements for seemingly the same product.
He also, this was in 1986 talked about how most designers did not understand the proper utilization of 'current' in design work, then he started losing me at that point in my career. At that time his amp was vastly 'clearer' and I guess therefore sounded 'faster' to me, in the way that tubes offer more delicacy (to me) and low level resolution.
My early days with Bryston date to 1985, then as I traveled the country for THIEL. Their distribution became spotty when the brothers split and Chris and John went separate ways, Chris going with Classe I believe.
But explaining speed is almost like explaining, as I said, tube delicacy. It's not that it doesn't exist, its just hard to make clear.
That is as when people talk about S/N ratios and they don't realize that 80db s/n ratio is 1/10,000th, then begin to what seems like a nit pick, with 80 db versus 100db, once you're already at 1/10,000th, isn't that already good?
So speed--yes, I think, that to me Bryston sounds softish, and slower than many other good amps. If that sounds like an indictment I apologize. But we ALL hear things so differently, one thing that is obvious to one person is not as obvious to another.
At 56, I had a hearing test, and my left ear was rated, according to the doctor, as 'perfect, and really remarkable', (he had the good grace not to say, for your age.) But the scale was not age relative, it was just perfect. I now realize why 'possibly' I hear and quantify things other people don't. Please don't take that as bragging since most of the things I hear, are unpleasant, so perhaps a curse in some ways.
I am sure your amp is excellent, just not my personal favorite.
Spectral, probably sets the world on fire with it's recovery times, yet to me sounds stark, and dry. So what does that tell me? Who knows?