WordPress has a tendency to overload hosting solutions, especially if you start getting a lot of traffic. For example, some of our partners Kafit were tasked with reviewing .SE’s solution because they were getting a lot of errors.
A simple solution that you can do yourself is to install a Cache plugin. The only question is; which Cache plugin is best? Tutorial 9 has made a great comparison that is worth reading.
The short version is that the best cache plugin is Hyper Cache closely followed by do it yourself.
Doing it yourself is done by adding the following to your .htaccess file:
This would then cause http://www.minsida.se/wordpress-genererad-sida to automatically get the html file located at the address http://www.minsida.se/wp-content/cache-manuellt-sparad-sida.html. This variant is the most accurate, but also requires extreme precision.