[pilsetnieks]

wu.apple.com is an address associated with location service requests. If you've disabled location for spotlight, it's possible that it was something else requesting the location.

No idea about that smoot thing, though.

[blantonl]

A quick fix would be to add wu.apple.com to your hosts file with an address of 127.0.0.1 - not long term and certainly not an overall fix.