Many blogs are completely dynamic and grab content out of a database on every request. The static site generation style fell out of early fashion when wordpress took over from moveable type, and didn't really return much until jekyll. Even today I think most blogs you see are mostly dynamic with the platforms using caching to avoid hitting the database every time.
Most people don't do performance tuning of their blogs because the average traffic is miniscule. This means that any configuration issues rear their heads when load happens. For example, having your max connections to the web server be far more than the database can support. Perhaps the machine could handle the load if properly configured, but no one did so because there was no need.
Most people don't do performance tuning of their blogs because the average traffic is miniscule. This means that any configuration issues rear their heads when load happens. For example, having your max connections to the web server be far more than the database can support. Perhaps the machine could handle the load if properly configured, but no one did so because there was no need.