I think the suggested is 1/3 of the available memory and that formula has worked well for me:
SYS(3050,1,VAL(SYS(3050,1,0))/3)
One place where it really helped was for http file uploads...
>How much foreground/background memory are you all allowing your COM servers to utilize using SYS(3050) running under WC for a given amount of available RAM, # processors, etc.? I am trying to apply some memory related tuning to try and avoid "Invokation" errors due to the COM system running out of resources.
>
>Thanks,
>Bill