Memory usage

[eluser]JonoB[/eluser]
I know that this is a very opened ended question that falls into the category of "how long is a piece of string?"

For each page load, a couple of queries (some fairly complicated) get exectued, and it seems like approx 80 files are being included.

I am seeing around 7MB memory usage for each page...but I have nothing to benchmark this against. At what point do I start thinking 'uh-oh'?