This adapter uses the Fastify web framework which allows Astro to deploy SSR sites to Node.js targets. It also uses comes with response compression which is enabled by default.
npm i --save-prod astro-node-fastifyastro add astro-node-fastifyInstall this package as a runtime dependency with the package manager of your choice. Afterward, you can configure which assets will be pre compressed, which cache headers the "public" should have, the default response headers that every SSR response should have, which compression algorithms should be available, and some more tweaks.
The configuration documentation can be found here: https://friedemannsommer.github.io/astro-node-fastify/.