Site Management Tools content is cached just as any other content on your site. When new content is published SMT related caches are cleared. Cache clearing occurs for both immediate publication and scheduled publication.
The cache clearing task is specific to the account’s site ID so that only the caches for the site where content was published is cleared. Caches for any other site owned by the account are not cleared.
The caches that are cleared include:
Media Coherence Cache
Ignite Response Cache
Hosted Page Util Cache