Spooling to printer on windows

[Delbert Martin]

I have an application that run on the cups server that automatically prints documents. The printer itself is attached to a windows machine via parallel port.
The printer is responsible for printing labels, so there are a lot of small print jobs that go through, and the time between labels seems to be a problem. on label will print then 10 seconds later the next one will print. If I watch the print queue on the windows computer it shows only 1 job at a time, I would expect the cups server to process the labels and pass them on to the windows machine as fast as possible thus creating more than 1 job in the windows print queue at a time. I have went through all of the filters one by one to see if the filters were holding it up. PDF->PS->Raster->DPL (Datamax I Series) none of these seem to take more than a second to process, so I'm kind of lost. It looks like the Cups server can have a queue of labels in its spool, so I was asking for some ideas on debugging this. To me it seems like cups is spooling the labels, and passing them one at a time to the windows machine, and after windows confirms it was printed, it send another one. Strangely, if I print this from my desktop there is only a one second pause between labels (almost continuous).