hmm interesting.
I've done countless of tests for range attack speed and found out that for guns, once you reach 42 speed (without the +30 from hunter bonus), in terms of normal attack, you cannot go beyond 13 attacks within 10 seconds. Even with 92 speed (+50 speed from 70 gun / 122 speed overall) it yields the same results.
+30 from hunter
+15 from swift prefixes
+20 from quickdraw 3
+7 from swift battle elite
1 - 0.72 = 0.28
3 (gun speed) x 0.28 = 0.84
10 / 0.84 = 11.9 (Rounded to 12)
10.92 seconds = 0.84 x 13
Watching the vid, there's definitely an increase in skill speed if you reach 87 speed mark.
Thanks for posting this. this actually will help out my guide I'm currently working on xD