What is the most efficient method for displaying a CMS block on category pages?

Specifying the 'Static Block' for the category is the most efficient method for displaying a CMS block on category pages due to the straightforward integration it offers within the Magento platform. By directly linking a specific static block to a category, you ensure that the content is contextually relevant and enhances the category page without the need for extensive custom development or additional resources.

This approach leverages Magento's built-in capabilities, allowing for easy updates and management of the CMS block content through the admin interface. It optimizes performance since it avoids any unnecessary overhead associated with more complex solutions like custom templates or third-party extensions, which can introduce dependencies, potential conflicts, and require additional maintenance or upgrades.

Utilizing predefined static blocks strategically can also aid in maintaining consistency across your storefront and simplifies the overall layout management for category pages. This option embodies the principles of effective e-commerce strategies by enhancing user experience while simplifying site management for administrators.