So, I was wondering if more then one Mei are using the freeze attack on a target, does it freeze faster?
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Based on a single Mei using her Endothermic Blaster in conjunction with Blizzard, I'd say no, but I haven't tested. – Wrigglenite♦ Jun 24 '16 at 12:31
No
During Closed Beta, multiple Meis using their primary fire would freeze a target faster, but the Nov 18 patch removed this ability.
From http://us.battle.net/forums/en/overwatch/topic/19892439723:
HERO BALANCE CHANGES:
Mei
If multiple Meis are attacking the same target, their freeze effects will no longer stack
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Interestingly enough, that video was posted on Nov 17th, one day before the patch that removed the ability. – Michael McDevitt Jun 24 '16 at 13:56
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@DanmakuGrazer yeah noticed that now, sad though, it was a very nice one – Shaeldon Jun 24 '16 at 13:56
If you freeze someone with multiple Mei's it goes faster.
Source:
Turns out this part is no longer relevant.