Ever since the introduction of the Gutenberg editor in WordPress 5.0, block development has completely transformed the way websites are built. Custom blocks give developers unprecedented control over content layout and editor user experience. However, when starting a modern block development project, you immediately face a fundamental decision: Should you build a static (React-based) block or a dynamic (PHP-driven) block?
While both approaches integrate seamlessly into the Gutenberg block editor, they handle data storage, rendering, and performance quite differently. In this article, we will break down the mechanics of dynamic vs. static React blocks, explore their pros and cons, and provide actionable tips to help you choose the right path for your next WordPress build.
Understanding Static React-Based Blocks
Static blocks rely heavily on JavaScript and React. When an editor adds a static block to a page, WordPress uses the block’s edit() function to render the interface inside the Gutenberg editor. When the post is saved, the block’s save() function processes the content and generates raw HTML markup, which is stored directly in the wp_posts database table inside HTML comments.
Key Advantages of Static Blocks:
- Blazing Fast Front-End Performance: Because the HTML is pre-rendered and saved in the database, WordPress doesn’t need to perform server-side processing when a visitor loads the page. It simply serves the static markup.
- Rich Editor Experience: Built with React, static blocks excel at providing instant visual feedback and smooth UI micro-interactions directly in the block editor.
- Reduced Server Load: No database queries or heavy PHP execution are required during the page render phase.
Ideal Use Cases: Call-to-action banners, feature grids, pricing tables, testimonials, and fixed layout components where the content only changes when an author manually edits the post.
Understanding Dynamic Blocks
Dynamic blocks, by contrast, do not save rendered HTML into the database. Instead, they store block attributes (JSON metadata) within the block comments. When a visitor requests the page, WordPress executes a PHP callback function (or a modern render.php file) on the server to dynamically generate and output the block’s HTML on the fly.
Key Advantages of Dynamic Blocks:
- Real-Time Data Fetching: Dynamic blocks can query the database or external APIs at the exact moment a page is requested.
- Global Maintenance Simplicity: If you update the HTML structure or styling of a dynamic block in your codebase, every instance of that block across your entire website updates instantly.
- No Block Validation Errors: Static blocks suffer from “block validation” errors when developers alter the saved HTML structure in React. Dynamic blocks completely eliminate this headache because HTML is generated on the server.
Ideal Use Cases: “Latest Posts” grids, live inventory lists, personalized user account dashboards, dynamic site headers, and any content relying on site-wide settings or external APIs.
Comparing the Approaches: Performance, Maintenance, and DX
To make the best decision for your site, evaluate your requirements against these core considerations:
1. Maintenance and Code Evolution
If you anticipate frequent structural changes to your custom component’s output, dynamic blocks offer superior maintainability. Refactoring a static block’s save() function requires writing deprecation handlers to prevent existing content from breaking. Dynamic blocks, on the other hand, let you update PHP templates effortlessly.
2. Caching and Scalability
Static blocks win on raw rendering speed out of the box because they bypass PHP rendering entirely on the front end. However, if your site uses full-page caching (such as Varnish, Redis, or WP Rocket), the performance gap narrows significantly, making dynamic blocks just as fast for site visitors.
Rule of Thumb: If the output depends on content that exists outside the Gutenberg editor itself (like post metadata, site settings, or database queries), build a dynamic block. If the content is self-contained within the block attributes, lean toward a static React block.
Actionable Tips for WordPress Developers
- Leverage @wordpress/create-block: Use the official scaffolding tool from WordPress. It supports templates for both dynamic and static block types, saving you hours of build configuration.
- Adopt standard render.php templates: Since WordPress 6.1, dynamic blocks can use a standalone
render.phpfile instead of an inline PHP callback function, making your template code much cleaner and easier to read. - Consider Hybrid Solutions: You can build a block with an interactive React front end using the modern WordPress Interactivity API while keeping backend rendering cleanly isolated in PHP.
Conclusion
Choosing between dynamic blocks and React-based components isn’t about finding which method is strictly “better”—it’s about matching the tool to the task. Static React blocks deliver unmatched editor responsiveness and light server footprints, while dynamic PHP blocks excel at real-time updates and low-maintenance longevity. By evaluating your project’s specific data dependencies and long-term maintenance needs, you can build custom blocks that provide exceptional experiences for both site authors and site visitors.