Can someone explain to me how strafing works?

SMGs and Pistols have faster strafr speeds.

Wraith also appears to have double strafe speed. 

For me 80% of Wraiths seem to strafe faster than a Stimmed Octane. That it can actually look like 2 wraiths on screen.

Dunno if its an exploit or the character is just shamelessly overpowered and devs cba to fix.