I see that Slushs keeps in 9.5 Ghps from a lot of time. Others pools (as bitminter where i´m moving due razonable fees on getwork), are growing fast. In fact, the named pool grows from 7.5Ghps to 13Ghps in 15 days or less.

This means that some miners are in disagree with slushs services, due some strange calculations, or punisher reward system, and don´t keep here, or move his fast miners to more fairly reward system.

It's mi opinion.