Only allow emotes to have a chatlog message once per ten seconds.

[Renik]

At least that's what I infer from Yoshi's statement that "We have the most data per character. Every 15 seconds we take a backup of every player’s data. This is good for players because if the servers crash there is no rollback...

You got this wrong, this limit is based on a static number which is the max number of characters online at the same time on a sever, max active characters per server, not current active characters, this max will be the same with or without afkers.

Afkers only hurt people with very low end PCs on crowded areas, and with queues after big updates, but SE enables autokick for that.