Non-mage classes & Casting speed

[Freeverse]

The mage-cs-topic has been discussed a million times since mages got nerfed.

Actually i'm curious, how much non-mage classes can improve the casting speed.
Why?
Since a few days i see a hunter with extraordinary casting speed. Almost instant Ambush. Almost instant distracting shot. Very fast camo.

Mages can have extra cs in three parts of the armour and in the staff.

I guess this hunter is using a 7% cs gem, that's out of question. But i never saw any archer leggins/bp/gauntles/etc with additional cs. Did you?
As far as i know there are no items, which can improve the cs for a non-mage class so much, except the gem in the weapon.

Or maybe there is another explanation how an archer can reduce ambush casting from 1 sec to 0.2 sec? And camo from 4.5 to 2 sec?

I'm sure there must be a logical explanation, because there are no cheaters in RO, so please save me from my ignorance once more :-)