I make a pin high when this code starts and make it low when it ends. Length of the pulse is measured with scope.
By setting
DEFINE LCD_COMMANDUS 900
DEFINE LCD_DATAUS 35

instead of default 1500/50, additional speed gains can be achieved, but it works same way on both MCU.

I will check the CLKOUT later. I have not measured it, but I did some PAUSE loops and times were correct, so I assume, chip is running at 64mhz.