Here are some tips on how to improve the performance of your WordPress blog:

• Reduce the number of posts on the front page of your blog
• Install anti-spam plugins in order to prevent spam-bot from creating load on the server.
• Optimize your WordPress database. You can do this using a plugin like this one or directly through the PhpMyAdmintool in your cPanel.
• Install a caching plugin such as WP-Cache or WP Super Cache.
• Decrease the number of external and internal links on your pages. Leave only the most important ones.