Just a try to show what effect the change has:

To do one PageProgram the Flash needs the following cmds/information (PROG=PageProgramCmd):
Flash-Cmds: JEDEC_WREN + PROG + ADDR + DATA

As flashrom communicates with the FTDI, there are additional FTDI-cmds necessary, of course.
This gives the following calls:

 ft2232_spi_send_command(XX, XX, ['JEDEC_WREN'], XX)
  before: -> send_buf(XX, [FTDI-CMD + 'JEDEC_WREN' + FTDI-CMD], 10) 
  now:    -> save i and buf as they are static, no further function call; buf = [FTDI-CMD + 'JEDEC_WREN' + FTDI-CMD]
 
 ft2232_spi_send_command(XX, XX, ['PROG', 'ADDR', 'DATA'], XX) 
  before: -> send_buf(XX, [FTDI-CMD + 'PROG' + 'ADDR' + 'DATA' + FTDI-CMD], 270) 
  now:    -> send_buf(XX, [FTDI-CMD + 'JEDEC_WREN' + FTDI-CMD + FTDI-CMD + 'PROG' + 'ADDR' + 'DATA' + FTDI-CMD], 280) 

=> saves one send_buf/ftdi_write_data call every page-program or erase action.

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