Why This Site Is Sometimes Slow

I have figured out why third-bit.com crawls from time to time: this blog is being inundated by a wave of comment spam. I'm using the Akismet plugin to filter it (I delete several hundred to several thousand spam comments a day, unread), but filing them away to be rejected is enough of a load on my server to constitute a denial of service attack in its own right :-(. I'm now thinking about relocating this domain and StreetKnit to dreamhost.com or some other hosting service --- I hope that'll provide more uniform service levels.