In theory, Google will render the apps or websites and index its content but the rendering is far from perfect, which causes your site to rank even lower than before in search engines. The user-experience is negatively impacted too because it can take forever to load all the JS libraries and bootstrap of these apps and websites.
• Compiling and running JS files can be time-consuming.
• For this, Google has to wait for all the steps to complete before it indexes the content.
Benefits of Isomorphic JS Applications:
Thus, the crawler and the browser see the same output. This solves the SEO indexing issue. As all of the content is rendered making search engine access the page easily.
Once the application is rendered on the server-side, you don’t have to worry about AJAX calls and this leads to reduced rendering on the client side.