What is Prerendering?

Prerendering is Prerendering is a process to preload all elements on the page in preparation for a web crawler to see it. A prerender service will intercept a page request to see if the user-agent viewing your site is a bot and if the user-agent is a bot, the prerender middleware will send a cached version of you site to show with all JavaScript, Images, etc are rendered statically. If the user-agent is anything but a bot, then everything is loaded as normal, prerendering is only used to optimize the experience for bots only. 

From Simba’s SEO Dictionary

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