If I've installed plugins that allow me to insert a special sequence into the post to make magic happen, the plugin will search for the sequence even if the special sequence isn't embedded in the post. If i have multiple plugins installed that have there own special sequence that you can embed, they too will search for the sequence in the post. These searches are expensive, and they are even more expensive when they are not required in the first place. Provide a mechanism for short circuiting this needless processing. The best approach would be to have this special processing done when the post is saved rather than every time the post is read. This may not be feasible for all types of plugins, those where the output changes every time the post is displayed are likely one class of plugin where this would not work. But it would work for every plugin that I have used.