Printing reports from Siemens multipanel

I have a Siemens multipanel 370, which has a laserprinter connected. I use the printer to print out reports. If my report only contains text and no output fields everything works ok. If my report contains output fields with plc-variables connected, there is more then one minute between the activation of the print signal and the actual start of printing. The activation signal I use is 'print report' connected to a softkey on the panel. When I activate a printscreen of a screen with plc-variables the printing starts immediately. How can I reduce the time between the activation of 'print report' and the start of printing?

Thanks,