We launched a complete React rebuild in March 2024. Traffic dropped 43% within two weeks. The site looked perfect in browsers, but Google Search Console showed massive indexing drops. We were rendering everything client-side, and Googlebot was seeing mostly blank pages.
The problem wasn't that Google can't render JavaScript anymore. It can. The issue was our rendering budget and timing. Our pages took 8-12 seconds to fully render, and we had API calls blocking content display. Google's renderer has limits, and we hit every single one.
**What should we have tested before launch?**Fetch as Google only shows you so much. We needed to check the actual HTML source versus rendered content. The gap was enormous. Our product descriptions, reviews, and schema markup only appeared after JavaScript executed. That meant Google had to spend rendering budget on every single page.
We should have tested with JavaScript disabled. Sounds obvious now, but in 2024, we assumed JavaScript rendering was solved. It's not. Server-side rendering or static generation should have been non-negotiable for content-heavy pages.
**How did we fix it without starting over?**We implemented Next.js with SSR for critical pages first. Product pages, category pages, and blog posts got server-side rendering. The interactive elements stayed client-side. Within six weeks, we recovered 89% of lost traffic.
The lesson cost us approximately $180,000 in lost revenue, but it fundamentally changed how we approach technical architecture. JavaScript rendering isn't about whether Google can do it—it's about whether you're making it efficient enough that Google will consistently do it.