Steps to improve WP performance
Before proceeding, please be aware that everyone’s site is configured differently. These are the tricks that helped us to speed up publishing, but they may not have the same effect for everyone. That said, here are some steps to improve the performance of your WordPress-powered site.
Delete rpc.pingomatic.com
Perhaps the most commonly recommended fix for slow posting: Remove rpc.pingomatic.com from the Admin » Options » Writing » Update Services panel. For some reason, pingomatic is really slow these days. Try using pingoat.com, or any other freely available tool (there are many).
Delete all cached content
Another trick that helps improve posting speed is to delete the entire contents of the WordPress cache. It is entirely safe to delete everything in the wp-content/cache directory. In case you are paranoid, make a backup copy before doing so 😉
Remove the admin post preview panel
If you never use the “post-preview” window that appears near the end of your “Write Post” panel, go ahead and remove it. Doing so will save bandwidth, load time, processing time, etc. To eliminate such superfluousness, crack open your wp-admin/post.php file and delete precisely the following region of code (located near line #83 in WP 2.0.5), which may look slightly different in previous versions of WordPress:
Source: WordPress on Crack: Tips for Faster Post Publishing | Perishable Press
