To achieve a fast label printout make sure you send the minimum amount of data to the printer.
Use the following optimizations where possible:
Use NiceLabel drivers
Use internal printer fonts. If you must use TrueType fonts, download them to printer memory.
Use internal printer counters.
In Label Properties > Printer tab enable:
Optimize printing of identical labels
Combine non-printer elements into one graphic when sent to printer
Use "session print". In this mode, you do not print the labels individually but send all data to the printer in a single print stream, and then execute printing.
If you do not achieve adequate label printing speed with steps 1 and 2, download your label file into your printer memory (for supported printers):
Design label in NiceLabel Designer.
In Label Properties > Printer tab enable Use store/recall printing mode.
Go to File > Store > Store to printer. You can also define your Store variant.
Programming Manuals for your thermal printer