It depends on the type of site you're running.
Since you're running a dynamic site (WordPress), it depends on the plugins you're running and what each person is doing. If they're just reading, it should be fine, but if they're all submitting posts, this might cause an issue.
A suggestion: I notice you're using a caching plugin. Remove WP Super Cache. The initial process to generate the static files trigger a high resource usage suspension and caching plugins are the most common source of these suspensions.