Attack Speed Display
Note from User:Emptylord
It can be observed using a build with sufficient attack speed that his reload timer no longer improves (presumed to be maximum attack speed) that his maximum attack speed remains 2.5, as it takes approximately 2 seconds to perform both the two attacks and reload. As displayed in his innate tooltip - 1.2 seconds of the 2 second observation is spent reloading, meaning the two attacks occur at 0.4 second intervals (i.e. 2.5 attack speed).
It is currently unknown if 0.481 also reflects his base attack speed, or whether it only represents his reload speed. From observation, at level 1 with minimal bonus attack speed his rate of fire is not one attack every 2.079 seconds - which would imply that his base attack speed is higher than his reload timer.