All my trumpets have fast valves so I can't use slow valves as an excuse. I don't think as fast as I used to, and this is more noticeable with each passing year. It happens with age. I just do my best to work it out by repetition of those passages that are slowing me down. It's seems to be working for me now on Liberty Bell so I am starting to feel pretty good about it.
Similarly, all of my horns have fast valves and are in good order. However, I learned a few things after spending an hour working with the four of them on one number. The piece I used was a march I sort of mangled last night, which was composed by the MD. This afternoon I seemed to be fastest and most accurate with the Getzen, followed by the Holton Galaxy. All of this is a little subjective, of course, but the ergonomics of the Getzen and Galaxy seemed to be advantageous. Each of the four horns requires different aspects of grip and finger angle. This afternoon I believe I got that sorted out.