My host recently contacted me saying that I was using far too much server load for my blog, and was going over my limit they accept on my hosting package. This has never been a problem, as I only get 150-200 uniques a day.
The problem is the wp-comments-post.php file is getting requested by spam bots, I admit I'm not the best in keeping things up to date, so I immediately updated WordPress and Akismet, as well as installing Spam Karma 2 and Bad Behaviour.
What I'm worried about that - checking my stats - I'm still getting a lot of spam (Akismet has gone up by about 20,000 in the last few hours), and that wp-comments-post.php is still getting accessed by the spam bots, which is increasing server load.
Do you have any other suggestions on what I can do to reduce server load?