Your JS site loads fast for users but Google might be seeing an empty page
Been auditing a few B2B SaaS sites lately and noticed the same pattern over and over: fast, smooth React/Vue apps that are quietly invisible to Google because of how they render.
The short version, Googlebot crawls in two passes. First it reads the raw HTML from the server. If that's mostly empty (common with client-side rendering), your content only gets seen later, in a rendering queue that can take days. If your JS bundle is heavy, Google sometimes gives up before rendering at all.
A few other things that quietly kill indexing on SPA/SaaS sites:
Nav links built with onClick handlers instead of real <a href> tags, Googlebot can't follow them
Content gated behind login with no public "sample" layer, totally invisible to crawlers
Infinite scroll with no fallback pagination in the DOM
Wrote up the 5 most common architecture mistakes I keep seeing (with fixes) if useful to anyone here shipping a JS-heavy product: https://www.fieldredactseo.fr/blog/seo-javascript-saas
Curious if others here have run into the "site looks fine, traffic won't grow" symptom and traced it back to rendering.
I use the raw HTML check as the first gate, before looking at Lighthouse or Search Console. Fetch the page without JavaScript, confirm the title, canonical, internal links, and primary copy are present, then compare that output with the rendered DOM. It catches the expensive version of the problem early, when a framework migration can still be changed without rewriting the whole site.