A friend of mine who runs a small personal weblog with next to no plugins has been getting al lot of 500 (internal server) errors lately. When she contacted her host they informed her that WP was using op to 18 MB of memory. Because of 'high resource usage', the process is being killed, resulting in the errors.
I'm hosted at the same host (Hosting Zoom), and although not nearly as frequent, I've been getting these errors too. I contacted another hosting company (Pair), and they informed me that hosting my WP blogs with them on anything but a dedicated server could cause problems. They recommended I use Movable Type ;).
My question is: Is WP really such a resource hog? I know it's dynamic by nature and thus uses more resources than a system like MT that generates static pages, but still... Or is my current thost just doing something wrong? I've hosted WP successfully on a-dollar-a-month type hosts, so I find it strange that a well-repsected host like Pair would be unable to host my low traffic blog(s).