Mass EP Award causes extreme slowdown

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What steps will reproduce the problem?
1. Start a recurring Mass EP Award for a 25-man raid.
2. Start a boss fight.
3. At the worst possible moment, the EP award will trigger causing your 
computer to completely freeze for five solid seconds.

What is the expected output? What do you see instead?
When a mass EP award happens, it should not be so CPU intensive as to cause 
such a FPS loss. Currently it brings my frames per second down to zero for five 
solid seconds.

What version of the product are you using? What locale is your client (en,
ru, kr, ch, es, tw)? What other addons do you have installed and what
versions? How many members do you have in your guild? (/guildinfo).

I'm using only the default English versions and I'm using EPGP 5.9.20 as well 
as EPGPLootmaster 0.6.36. I always update to the latest version within 24 hours 
and this behavior has occurred in all versions I have used since I started 
using EPGP & EPGPLootmaster a month ago. I use several other addons including 
the latest versions of Skada, DBM, Clique, Auctioneer (not during boss fights), 
and Bartender. My guild has 926 players in it.

Paste the text surrounded by -EPGP- in Guild Information here:
-EPGP-
@BASE_GP:2000
@DECAY_P:20
@MIN_EP:4500
@EXTRAS_P:50
-EPGP-

If this is about http://www.epgpweb.com integration, what is the realm
and region of your guild?

N/A

Please provide any additional information below.
I am the master looter for a 25-man guild with usually 5 to 10 people on the 
waiting/standby list. I'm guessing that updating all these people's EP during a 
boss fight causes a large CPU load until it finishes. I'm wondering if I will 
be able to continue to use this addon if it causes me to die in heroic fights.

My suggestion is to look into how the Auctioneer addon handles CPU usage. There 
is a setting within that addon allowing you to set the minimum acceptable FPS 
during processing. The Auctioneer addon scans and processes *all* items 
currently on the auction house and is able to do so without causing a 
significant drop in FPS. On a high population server, this can result in ten 
minutes of processing but it is not a problem because it throttles its own CPU 
usage.

Original issue reported on code.google.com by JuicyJuuce on 14 Dec 2013 at 11:37

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Also, just to clarify, my comment about the Auctioneer addon was just to 
indicate an example of a separate addon that handles CPU usage well. It was not 
to indicate that somehow Auctioneer was causing the problem in this ticket. I 
have Auctioneer completely disabled when this problem occurs.

Original comment by JuicyJuuce on 14 Dec 2013 at 11:41

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My raid has this issue, too. If EP awards could be delayed until combat ended 
that would probably be fine.

Original comment by krboiss...@gmail.com on 23 Dec 2013 at 4:29

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We don't see particularly high cpu use when our awards go out in combat, but it 
can be costly depending on your connection and system specs.  Will look into 
doing something to improve this.

Original comment by chip.turner on 23 Dec 2013 at 7:14