Yeah, but I've read of people with 20M+ files with essentially zero framerate/slowdown.
When they finally fixed it with 1.4 (and borked some of it again, in 1.5...) we haven't really had issues since. I'd look now, but I don't feel like fishing around... but I'm certain I've had 18+ with no issues at all, and I don't even buy/decorate houses. = D
I work hard, but I'm underpaid. I'm tired, and I'm restless.