Proper order of how quiver bow delay reduction is applied?

[Buellen]

Hello everyone

For now this probably more a blue question but i wanted to ask here.

So I just learned the quiver bow hast is technically bow delay reduction.

My question :

Say i have FBSS 21% haste using a runed oak bow 21 dam 43 delay and a standard quiver 20% wt reduction.

Is the 2 pt of bow delay reduction applied before haste etc for purpose of shoot or after.

Does quiver make any real difference if you have haste item already ?