Barrage support vs GMP support PARADOX

I'm confused that despite Barrage support give APS and mana cost lower than GMP but seems like it drain mana faster than GMP? Is it a bug

Here is the record I test this
https://vimeo.com/414523515

Barrage support give APS around 2.5 at max with mana cost 18. But it drain mana faster (despite my mana regen is 45 higher than the cost x APS)

GMP support give APS around 2.7 at max with mana cost 19. But seems like it no drain mana or drain very slow

P/S: I provide another video about the test https://www.youtube.com/watch?v=6ihos7IB0gs

you are animation cancelling your barrage attacks. dont spam click, click and hold.

I just hold the skill keys for both support gems

Frenzy Barrage: 18 x 1.46 Atk/sec
Frenzy GMP: 19 x 2,12 Atk/sec

your build actually "heats up" and gains attack speed with repetition. At their peak, we have:

Frenzy Barrage: 18 x 2.4
Frenzy GMP: 19 x 2.71

I believe the difference is in the attack animation, which is changed from your Barrage. A barrage attack takes way more time than a normal attack, from wands or bows alike. It's similiar to what Multistrike or Spell Echo do to skills: single cast, more attacks. Try attacking with a Trypanon with Heavy Strike with Multistrike and without - you'll notice the multistrike will give you more time to regen mana before another attack is prompt

Also, remember what Thror2k5 says: cancelling an attack is now a thing, and it can happen quite easily with attacks (WAY too many Blink Arrows and Leap Slam cancelled...). It's clear you are not doing this in the video, just a suggestion on the actual battlefield.

@Maxtrux, yes, it's what I'm confused.
So we have Barrage attack less frequently and less mana cost than GMP, thus it should drain less mana per second than GMP. However, as my test (video), Barrage does drain mana faster than GMP

Yes, I have said that number should follow your logic, but I also said to consider the attack animation. I believe that's what actually makes barrage so draining. In other words, just going barrage gives you an "intrinsic" boost on the attack speed

I have noticed the same behavior with Ice Shot - I could not resort to a 0.4% manaLeech as I usually do with all my other non-mage builds for mana compensation if I went barrage, but non-barrage Ice Shot was A-Ok. Wand attacks have an attack animation a bit more "clunky" from bow attacks, so maybe it's even more evident.

I REALLY wish GGG would, one day, release a "dps dummy" kind of feature. It would settle this kind of discussions

Yes, so in real case Barrage will give more ATK speed, fire projectile in sequence regardless the tooltip maybe show not correct thing

So does anyone have a chance to test this out?