Grasshopper Hangs on every change to canvas...

I'm having a new and exciting problem here --- Grasshopper (8.0010) hangs for a few seconds every time I make any change to the canvas - connecting a wire, dropping a new component, etc.

once the "freeze" thaws, there is no problem panning around the canvas, editing geometry in rhino, etc, but whenever i make any change, it just pauses...

Another thing to note --- this is only happening at home. Normally I work in GH from the office, but today I've brought my work laptop home. Same computer. Same setup. The only difference is my network connection - at home I'm on my personal wifi and connected to my work VPN, whereas at work i'm hard-wired onto the local network.

So, I imagine the performance issue has something to do with this --- my work VPN is notoriously slow when accessing from home, so if GH or Rhino is attempting to access some temp file on the network drive, that may be causing the lag.... but I have no idea what it could be looking for, since all the files i'm working with are on my local hard drive.

has anyone else had this kind of issue? it's really quite annoying, and it's stopping me from getting any work done at home.

any ideas?