Server-Side Rendering (SSR).
Server-Side Rendering (SSR) means that HTML pages are generated on the server and sent fully rendered to the browser — as opposed to Client-Side Rendering (CSR), where JavaScript builds the page in the browser. SSR significantly improves LCP, FCP and SEO.
Server-Side Rendering (SSR) — Explained in Detail
Server-Side Rendering (SSR) is a rendering strategy where HTML pages are fully generated on the server — before being sent to the browser. The browser receives fully rendered HTML content and can display it immediately without first having to execute JavaScript. In contrast, Client-Side Rendering (CSR) first loads an empty HTML page, then JavaScript, and the JavaScript only then builds the page in the browser — slower and more problematic for SEO.
Why is SSR important for performance and SEO? SSR significantly improves FCP and LCP: since the browser immediately receives HTML, it can display the first content much faster. Additionally, search engine crawlers can read HTML content directly — without having to execute JavaScript. This improves indexability. React applications with SSR (via Next.js) achieve Core Web Vitals values that are hardly achievable without SSR.
Variants: Full SSR (every request generates HTML on the server), Static Site Generation (SSG, HTML is generated during the build process — ideal for pages without dynamic data), and Incremental Static Regeneration (ISR, a hybrid: statically generated but with a configurable revalidation interval). DLM Digital uses Next.js, which supports all three strategies and selects the optimal method depending on the page type.
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Premium WebsitesFrequently Asked Questions About Server-Side Rendering (SSR)
SSR (Server-Side Rendering): HTML is generated on the server and delivered fully rendered to the browser. The user sees content immediately. CSR (Client-Side Rendering): The browser loads an empty HTML page, then JavaScript, which then builds the page. LCP and FCP are significantly worse with CSR. SSR is the clear winner for SEO and performance.
CSR is suitable for highly interactive applications (e.g. dashboards, internal tools) where SEO is irrelevant and everything happens client-side after the initial load. For public websites and e-commerce, where SEO and fast initial loading are critical, SSR or Static Site Generation is superior.
React: Next.js (SSR + SSG + ISR). Vue: Nuxt.js (SSR + SSG). Svelte: SvelteKit (SSR + SSG). Angular: Angular Universal (SSR). DLM Digital primarily uses Next.js — it offers the most flexible combination of SSR, SSG and client-side hydration and is the most widely used React SSR framework with an excellent ecosystem.
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