With more and more ASICs coming, much bigger load is expected to the pools, so maybe they are working on some optimizations?

Having seen how Slush operates, he would normally post something even if it were 'I will look into any issues when I get a moment' kind of post, even when up to his ears in shit when the OVH hack happened and he was working flat out to sort it he still maintained comms.
I hope all is well with him but am a wee bit concerned.

Yes but even saying I'm hire will look into next mount would help. He is away now for 15 days. As far as I know this is not normal for him and saying anything else is just lying to yourself. Something is wrong. Even on holidays(I don't believe that they are so long) I would post something like I will look into this when I will be back on... So relay there is something else and the only explanation I can think of is that something happen to him and can't post or look at the pool.