In WS prefs under printing the Set special Printer buttonm has to be used. The default setting is used for thermal printers and printers with good memory onboard. the defaul is:
OPOS support REprinterEX COM SERVER
this sends the data in syncronus mode. (1 large print job, which the dardware memory handles)
the setting for star sp200 or similar printers is the setting:
OPOS support REprinter COM SERVER
Notice the EX is missing here!
this setting sends bits of the job memory clears and then it sends more. this allow the printer to print faster.