This problem has been addressed by Mythic, so this patch is no longer necessary and won't really do anything for you.

-------

If you're in a large guild you might have noticed that there is hitching/lag/a pause every time someone logs in, logs out, is added to the guild, and so on.

This is a dumb hack to "fix" it until such time as Mythic fixes the root causes. The client's guild roster appears to be rebuilt from scratch every time a guild member's status changes. This hack stops that unless the guild window is open, and also forces it to happen when the guild window is toggled.

You will still receive login/logout messages and so on. I have not observed any problems caused by ignoring the updates like this, but YMMV.