The effect of spam comments on hosting resource usage (CPU)

Any time your traffic goes up your CPU usage will go up. Based on what you’re saying it could be bot activity. I’m also assuming you’re on a shared host that is overloading the server with 10 billion accounts.

My suggestions include:

  • Running a virus scan for WordPress via any number of available plugins
  • Minimize the number of plugins you’re running, as they can impact your CPU usage
  • Decrease your database size, be sure deleted tables are actually deleted
  • Add a cache plugin http://wordpress.org/extend/plugins/wp-super-cache/
  • Look for unusual/frequent bot activity and block those suckers

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