I noticed our companies Ember.js based SPA site not being indexed well until I added a sitemap. Then it quickly appeared in the rankings.<p>Historically Google has been using some fork of Chrome 10 when indexing. I&#x27;m unsure what impact that is having on the reliability of app rendering, but I also trust the Google search team has done reasonable checks ensuring common sites and frameworks render correctly.<p>I strongly suggest using a sitemap for JS rendered sites, based on my own experience.