Slow printing problem.

Hello,
We have a printing problem on xerox printers installed in the same network located on different levels of a building.
The first printer, xerox versalink c7025 is located on the 3rd floor and the second, xerox workcentre 7225 is located on the 7th floor.
When printing on the xerox workcentre 7225 printer of the 7th level, the files print without delay, on the other hand, the same printing launched on the printer xerox versalink c7025 of the 3rd level, the files print with a largeslowness while the drivers are installed correctly and they are PostScript drivers.
What can this be?we ask for your assistance.

Cordially.