CSR, SSR, SSG: who draws your site''s screen and when — three methods that decide your SEO, speed and cost

Q: How do I tell which one my site uses now?

Right-click and View Source: if the text you see is in the source, it''s likely SSR/SSG; if the source is nearly empty with only scripts, it''s CSR.

Q: Is a pure-CSR site doomed for SEO?

Not doomed but harder. Google runs some JS but crawls slowly and can miss it; AI crawlers often read only raw HTML. Don''t bet CSR on pages chasing search and AI traffic.

Q: So should I use SSG everywhere?

Not necessarily. SSG is fastest and cheapest but any change needs a rebuild, unsuitable for constantly changing content. Use it in the right places.

Q: Does this affect the quote?

Yes. SSR hosting and architecture usually cost more than SSG; CSR can mean more front-end hours. Understanding these lets you see where quotes differ.

Opening scene + why these three together

You hire a vendor to build a site and their proposal says "this page uses SSR, the blog uses SSG, the admin uses CSR." You nod along, understanding none of it. These three terms (CSR, SSR, SSG) describe three ways of doing one thing: who draws your site''s screen, and when. It sounds technical, but it directly decides whether your site is visible in Google search and AI answers, how fast it loads, and how much your hosting costs each month. That''s why they belong together — choose wrong and SEO and speed both suffer. Three ways a restaurant serves food explains it.

CSR: Client-Side Rendering — "ingredients on the table, you cook at your seat"

One line: the screen is assembled on the fly by the user''s browser.

Analogy: the restaurant hands you ingredients and a stove; you cook at your seat. The first dish is slow (the browser downloads a big bundle and draws it), but switching dishes (pages) afterward is fast because the stove''s already there.

Example: say you''re a cram school building a "students log in to see grades and schedules" back office. Post-login, highly interactive pages that don''t need Google indexing suit CSR — search engines shouldn''t see student grades anyway.

SSR: Server-Side Rendering — "cooked to order, served whole"

One line: on each visit, the server assembles the full screen and sends it.

Analogy: you order, the kitchen cooks a full plate and brings it. You see the complete dish the moment you sit (fast first paint, complete content); the cost is the kitchen cooks every order (the server computes each request, higher hosting load).

Example: you''re an e-commerce site where prices and stock change constantly and you badly need Google indexing. SSR gives Google''s crawler complete content on arrival, with always-current prices.

SSG: Static Site Generation — "central kitchen pre-makes bentos, grab and go"

One line: screens are pre-built into files "when the site is built"; visitors grab the ready-made version.

Analogy: the central kitchen makes all bentos the night before; guests just pick one up — fastest and cheapest (no cooking on demand), but the menu is fixed; changing content means making a fresh batch (rebuild).

Example: your cram school''s "About, faculty, blog posts" — pages that rarely change — with SSG have near-zero latency, dirt-cheap hosting, and are friendliest for SEO and LCP (Largest Contentful Paint).

How the three relate (concept map)

Picture a timeline of "when the screen gets drawn": SSG on the far left (drawn at build), SSR in the middle (drawn per request), CSR on the far right (drawn once it reaches the browser). Further left = faster, cheaper, more SEO-friendly, but less live; further right = more live and interactive, but slower first paint and harder SEO. In practice a site often mixes: blog on SSG, product pages on SSR, member back office on CSR — right tool per place, not one for the whole site.

Concrete impact on your decisions

SEO and AI visibility: pure-CSR pages may look blank to search and AI crawlers. Pages that must be searched or cited by AI should prefer SSR or SSG.
Speed and conversion: first-paint speed (LCP) directly affects bounce and conversion. Choose SSG/SSR for marketing and landing pages; don''t make visitors wait for the browser to draw.
Hosting cost: SSG can sit on a CDN at tiny cost; SSR computes per request, so hosting gets noticeably pricier at high traffic.

5 questions to ask your vendor

Does this page need to be found by Google and AI? If so, will you use SSR or SSG?
Which pages will you build with CSR, and why don''t those need search indexing?
If SSR, roughly what''s my hosting cost, and how does it change as traffic grows?
If SSG, how soon do content updates go live? Does it require a rebuild?
Will you mix approaches? Can different pages use different methods?

FAQ

How do I tell which one my site uses now?

Quick test: right-click and "View Source." If the text you see is in the source, it''s likely SSR/SSG; if the source is nearly empty with only scripts, it''s CSR.

Is a pure-CSR site doomed for SEO?

Not doomed, but harder. Modern Google runs some JavaScript, but crawls it slowly and can miss it; AI crawlers often read only raw HTML. For pages chasing search and AI traffic, don''t bet on CSR.

So should I use SSG everywhere?

Not necessarily. SSG is fastest and cheapest, but any change needs a rebuild — unsuitable for constantly changing things (live stock, personalization). Use it in the right places, not site-wide.

Does this affect the quote?

Yes. SSR''s hosting and architecture usually cost more than SSG; CSR can mean more front-end hours. Understanding these three lets you see where quotes actually differ.

Call to action

Not sure which pages should use which? Book a free 30-minute technical consult and we''ll map "which page SSG, which SSR, which CSR" into a table so neither your SEO nor speed loses out: