Whenever i hit the hotkey to bring up the alfred window it takes a few second for it to appear, after a bit of testing around it seems to be related to when accessing a network drive.
So when the network drive is mounted, regardless if i have a finder window open, it takes alfred a good few seconds to appear.
If i immediately hit the hot key again, the alfred window pops up, but give it a few seconds and when i try it again the lag is there.
If i unmount the network drive the lag is gone, as in the alfred window will appear immediately.
Alfred version 2.0 (166)
OS X 10.8.3