Suggest how to debug this?

[jpc]

Jim,

try to get as short main looptimes as possible, it is unlikely you have to write to GLCD so often, by only updating the display when really needed i succeeded to get looptimes of ~5 ms on P18 dealing with 8 portexpanders, LCD, Ethernet etc. Probably most of the GLCD-code is just delay's, unfortunately these cannot be used.

[JimKueneman]

When I was using a LCD 5ms was about where I was as well. In the final version I will slow down the GLCD update rate. Right now I am using it to help debug what is happening in my code through displaying my internal data structures.

Thanks for the help.
Jim