My archery club has aquired a chronometer. I tried 3 bows with it. A 35lb longbow, a 65lb longbow and a 95lb warbow. Used the same arrows for each bow. Drew to the same anchor point, everything as identical as possible.
Each bow came out to the same speed plus or minus a couple of feet per second. That probably means the light weight bow is very springy and the warbow isn't very springy at all. Hmmmmm