TL;DR
Server-side rendering (SSR) generates the HTML for a page on the server and sends a fully rendered document to the browser, while client-side rendering (CSR) sends a minimal HTML shell and relies on JavaScript in the browser to build the page.
What is SSR vs CSR?
Server-side rendering (SSR) generates the HTML for a page on the server and sends a fully rendered document to the browser, while client-side rendering (CSR) sends a minimal HTML shell and relies on JavaScript in the browser to build the page.
Learn more in our choosing a rendering strategy for speed guide, or work with us through our done-for-you speed optimization service.
How SSR vs CSR is Measured
The rendering mode is observable by viewing the raw HTML response and the time the page takes to display content with and without JavaScript.