Receipt printer running slow

Q. I have an Epson TM-T88iii receipt printer and it runs slow on your program but fine on my other point of sale program.  Any suggestions?

It sounds like you're running it through a printer driver.  If it's a parallel or serial interface (not USB), you can use the "Direct to Port" option so it's faster (see File / Printer Setup / Receipt Printer, Direct to Port).  This was added in version 3.1, so if you don't see that option then you need to get the latest version.  Once you've enabled that and selected the port for it ("lpt1" for parallel, probably "com1" for serial), then there will be  new 3" receipt format listed -- use the "direct to port" one instead of the "fixed pitch" or "proportional" receipt formats.