It’s an know issue in the paladin community and easily reproduce able!
AM = Aura Mastery
DV = Devotion Aura
If u have a holy paladin in your raid and he Uses AM (tested with DV) then it brings most player’s (excluding the paladin using AM in most cases) game to lag/stutter for the whole duration of AM (8s).
This effect is worsened in the number of paladins in raid (with the same aura active which is common btw.) increases.
It seems that this problem is triggered by an massive amount of applying/removing the Paladin aura to/from the raid.
An example from one of my raid logs:
Some Statistics from our raid 2 days ago
Diurna(N)| 5:48 |1 Hpal = 1025
Raz(N)| 10:40 |2 Hpal = 3833
Eranog(H)| 3:19 |2 Hpal = 1052
Terros(H)| 4:56 |2 Hpla = 6697
Sennarth(H)| 5:10 |2 Hpal = 2553
Kurog(H)| 8:09 |2 Hpal = 5940
Council(H)| 3:47 |2 HPal = 3716
the number at the end counts the applications of the used Aura (in this case Devotion Aura).
as a comparison from an old log from Shadowlands:
Jailer (H) | 9:17 | 1 HPal = 460
This needs to be addressed ASAP.
It’s so bad sometimes that we loose more player’s to this artificially induced lag that the AM Saves and we are even considering skip out on this massive 15% raid dmg reduction cooldown to make it easier.
But that shouldn’t be intentional and is only one of many existing Paladin (Mainly Holy Paladin) bugs which makes playing the class harder than it should be.
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If you want to tell Blizzard about this bug, and not just the other players, you need to make a bug report from in-game.
The forums are not the place for bug reports in the EU regions.
You will also probably need to make it a lot more concise
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already reported multiple time over the last month but there was neither a response from blizz over official social media channels nor an entry in “known issues” which leads to believe that this is intended or just ignored
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Facing similar issue with our raids and we have two holy paladins so imagine the deaths because of using AM especially when mechanics requires getting out of the way of something.
Hey Ällikillä,
Our developers are apparently aware of this issue, and are working on it. While I don’t have a date for a fix, this is a high priority bug and should be fixed soon.
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good to hear, i hope the fix comes really soon.
this but is already exists long enough ^^
Any updates? It’s causing us major issues in raid.
Looks like the changes needed to how auras work are significant, which means that this issue is still being worked on. ETA should be the next patch, although it’s unfortunately not something I could guarantee. 
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thanks for the updates again 
Just wanted to find out if this is going to possibly come out with 10.0.7? Have not really seen anything on the PTR notes so far.