If you are suddenly receiving a lot of request within a short period of time because you’ve been linked by a large site like Digg or Slashdot, your hosting solution might not be able to handle the load.
This article should help your to prepare your WordPress blog for such a case or if you’re just using a slow webhost and want to improve the general performance.
For blogger who self-hosts the WordPress blog publishing system on a web hosting server with own registered domain name, sometimes, you may decide to reorganize the blog link URL to make it tidier or to reflect new focus or theme of the blog. If you decide to change the URL or link location of your WordPress blog due to changing of domain name (such as from http://www.old-domain.com/ to http://www.new-domain.com/) or the blog to another directory location (such as from http://www.domain.com/ to http://www.domain.com/blog/), there are some steps that should be done to ensure the proper migration and no breaking links.