Is running speed affected by what weapon you have active?
Solution 1:
According to the Wiki, movement speed varies by weapon type, as well as being unarmed:
Apparently, you run fastest with a pistol out. The difference between the weapons types is fairly minimal, but it is noticeable when playing with teammates who have no weapon equipped versus one with say a rifle out.
A pistol is .03m/s faster than throwables. The wiki sources this video that tests all of the possible equipment (as well as stances).