Processes are only overloaded in that they are a primitive. I'm not sure if this is what you're implying, but a single process shouldn't be doing all those jobs at once. For example only supervisors should be dealing with error isolation. As for sending large amounts of data between processes, I can only speak really generally here, but one common way is to flip the script and send functions to the data instead of the other way around but ya, bigger topic! When I say for "free" I mean more like my sibling comment where you don't have to think about every possible way something can fail.