Thanks for clarify that "tongue in cheek"-thing, sometimes I'm not familiar with these kind of phrases

500 is certainly waaay to much. Even we do not have more than 150 messages per mission, not to mention that this limit isn't supported in Fred either. So if you have already problems with the memory used, rather reduce this limit , maybe it makes things easier for another SEXp-Node raising.

(Just a thought, I don't have a real imagination how the exe is controlling it's resources.)
Is the limit somehow calculated on the size of the messages themselve, or is it a real message-counter ?