FWIW it's very minimal in terms of resource usage --
currently @ 9MB memory use, and at times it goes *up* to >0.01 CPU (mostly it's not using any).
In everyday use, the only messages I get would be as per your request, and/or if an app puts itself in start-with-Windows.
I mostly dont use the rest of it's capabilities, but it can be helpful in tracking down malware etc.
They still have a free version, but it's not clear to me if it will do what you want.