I have a website with 6000 posts and it is extremely slow.
Sometimes I get this error in my browser:
Service Temporarily Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. Error: 503 Service Temporarily Unavailable
I have turned almost all plugins off and it is slow in frontend and in backend too, so I guess it is not because of the template.
Could it be because of WP_navigation plugin?
I have est. 600 pages with ten posts or WP navigation plugin, could this be the problem?