I did not find what I am looking for neither here nor in FME Website. When I run some workflow I get that warning message (it is displayed in French I am not really sure of the accurate translation) :
Cache functionnality turn on. The workflow may run slowly because of saving features on each port and connexions
My question is, how may I turn off cache before running an heavy workflow ? The fact is that sometimes FME stops because it has reached maximum memory.