The Definitive Dark Knight Guide

[Gardes]

Actually I've found oGCD macros do slow down your wheel, you can hit 1 oGCD macro'd without delaying the GCD wheel, but if you try hitting 2 oGCDs (that are both macro) it does.

for example a macro of:

/ac Sentinel <me>
/ac Bloodbath <me>

Hitting it repeatedly between a GCD will delay the next. Also I've felt you need to tap it repeatedly - as the click doesn't 'register' unless the GCD wheel is passed 30-40%

without the macro just using the 2 oGCDs vanilla will be faster and not delay the next GCD (although Bloodbath may be a bad example, I feel that that OGCD has relatively long animation - but most others can do 2 oGCD between GCD without interrupting)

The difference is pretty huge actually since you CAN queue OGCDs. Just try tapping 2 gcds in succession with no timing what so ever, just tapping them once each really fast and the 2nd ogcd will cancel the 1st one's animation way faster than when you have 2 OGCDs macrod and mashing it.