I'm using the gas uprez DOP to, er, uprez my lo-rez dops sim. Unfortunately, it is taking forever to cook. Looking at the status bar, I see it starts cooking at frame 1, even though I'm on frame 15. I thought the whole idea was that it loaded the lo-rez sim from disc and just advected noise into the velocity fields and then didn't have to cook the previous frames.

I am sure that it's set to load from file. Loading the lo-rez sim into Houdini with a file sop takes about 10 seconds.

Is this expected behaviour or am I doing something wrong?