Should you really choose server-side rendering over dynamic rendering?

What is the difference between SSR and dynamic rendering?

Server-side rendering generates the complete HTML on the server before sending the page to the browser. The content is immediately available for Googlebot and the user, without waiting for JavaScript execution.

Dynamic rendering, on the other hand, detects whether the request comes from a bot or a user. In the former case, it serves a prerendered version of the HTML; in the latter, it sends a JavaScript application that runs on the client side. This is a historical compromise for single-page applications (SPAs) that are unable to manage SSR.

Why does Google prefer SSR today?

The reason can be summed up in one word: performance. An SSR site loads faster, improves Core Web Vitals (LCP, CLS, FID), and offers a better mobile experience. Google insists that if the implementation effort is similar between the two approaches, it's best to choose the one that benefits end users.

Subtext: dynamic rendering is perceived as a technical band-aid, a temporary solution that Google has long tolerated but never encouraged. With the rise of modern frameworks capable of native SSR (Next.js, Nuxt, SvelteKit), the argument of "it's too complex" no longer holds.

Is dynamic rendering now penalized by Google?

No — and this is a crucial point. Martin Splitt does not say anywhere that dynamic rendering is penalized or that it harms SEO. He states it is less optimal. An important nuance: if your site uses correctly configured dynamic rendering, Googlebot will index your pages without a problem.

The real risk is that this statement may be interpreted as an implicit warning: "prepare for dynamic rendering to become obsolete." Google has previously announced the discontinuation of certain technical recommendations. There is no indication of an imminent change, but the direction is clear.

• SSR: complete HTML generation on the server, immediate loading, better performance.
• Dynamic rendering: dual version (bot vs user), historical compromise for SPA, tolerated but not encouraged.
• No proven SEO penalties for correctly implemented dynamic rendering — for now.
• Underlying trend: Google is pushing towards modern architectures where SSR becomes the norm.

Is this recommendation consistent with on-the-ground observations?

Yes and no. On new or redesigned sites, technical teams are indeed choosing SSR from the outset — Next.js, Nuxt, and similar frameworks have become mainstream. In these cases, Martin Splitt is right: why bother with dynamic rendering if you're building from scratch?

But here's the problem: a massive part of the web relies on legacy stacks (old Angular, React without SSR framework, e-commerce sites on proprietary CMS). For these projects, migrating to SSR often involves a complete overhaul — significant budget, technical risks, delays. Dynamic rendering remains a pragmatic and effective workaround.

What nuances should be added to this statement?

First nuance: Google claims that "both approaches are complex to implement," but this is false in many cases. Setting up dynamic rendering via Rendertron or Prerender.io can be done in just a few days on a standard React site. Redesigning to SSR can take months.

Second nuance: the recommendation assumes that user performance and SEO are always aligned. This is not always true. A highly personalized e-commerce site (real-time recommendations, dynamic stock, geolocated pricing) may require client-side JavaScript to function correctly. Serving SSR everywhere becomes a challenge.

In what cases does dynamic rendering remain relevant?

Legacy sites that cannot be redesigned without a colossal budget. Complex SPAs with high user interactivity. Projects where time-to-market is crucial and where an SSR solution would take too long. [To be verified]: Google claims that the implementation effort is similar, but there is no concrete data to support this claim. On-the-ground feedback shows that it varies greatly depending on the existing architecture.

In short, dynamic rendering is not dead. It is just in a phase of slow depreciation — like Flash in its time, but without an announced end date.

What should I do concretely if my site uses dynamic rendering?

First, don't change anything in haste. If your site is ranking properly and your pages are indexing without issues, you have no immediate SEO urgency. Check that the bot rendering matches the user rendering (URL Inspection tool in Search Console, or tools like DeepCrawl, OnCrawl).

Next, include SSR in your technical roadmap in the medium term. If you plan a redesign or framework migration, it’s the time to switch. If your current stack doesn’t easily allow it, maintain dynamic rendering but keep an eye on Core Web Vitals — that’s often where the problems lie.

What mistakes should be avoided during an SSR migration?

First classic mistake: thinking that SSR solves everything. A poorly configured SSR (high server generation time, nonexistent cache, server overload) can be worse than a well-optimized dynamic rendering. Test the server load, implement edge caching (CDN), and measure TTFB before and after.

Second mistake: forgetting JavaScript hydration. SSR sends static HTML, but JavaScript must then "hydrate" the page to make it interactive. If this phase is poorly managed (too heavy a bundle, blocking JS), you lose all performance advantages. Audit the Critical Rendering Path and split your bundles.

How can I verify that my site truly benefits from SSR?

Disable JavaScript in your browser and reload the page. If the main content displays correctly, it's that the HTML is indeed generated on the server. If the page remains empty or shows an infinite loader, you are purely in client-side rendering.

Use the View Rendered Source tool (Chrome extension) or compare the raw "View Source" with the inspected render in DevTools. SSR should produce complete HTML from the source, without relying on JS execution to display the main content.

• Audit bot vs user rendering (Search Console, server logs, crawl tools)
• Measure Core Web Vitals under real conditions (CrUX, RUM)
• Plan for SSR migration in the roadmap if redesign is anticipated
• Test server load and TTFB before SSR deployment
• Ensure critical content displays without JavaScript
• Optimize JS hydration to prevent performance regressions