hmmm interesting, i've also been having crazy slow downs on my WHS lately as well, and have tentacle software, removed it, lets see if it gets better.
My WHS has been slowing down too! But that is because for some odd reason the nic is switching between 100mbps and 10mbps. I have done everything software wise to figure it out so I guess the hardware is doing its death knell. Where are you Sandy Bridge motherboards!?!?