Speed modifiers under different scenarios, starting with current game speed as the fastest:

1) fastest — running with no gun out
2) fast — running w/ pistol, SMG, or gadget in hand
3) medium — jogging w/ rifle, shotgun, or sniper in hand
4) medium-slow — fast walking w/ rocket or LMG in hand
5) 25% slower — while hip firing (weapon dependent)
6) 50% slower — aiming down sites / scope