One of the most common causes of ranking drops is a gap between what you see when you visit your website and what Google's crawler sees when it visits. Client-side rendering, bot detection, personalisation, and caching can all create a version of your site that ranks well for you in your browser and barely exists for Google.
The Googlebot rendering gap
Modern Googlebot can execute JavaScript and render client-side applications — but not perfectly and not immediately. Pages that load content via JavaScript after the initial HTML response may be crawled with empty content on the first visit and re-crawled for the rendered version later. Pages that use JavaScript for SEO-critical content (title tags, H1s, meta descriptions) are particularly vulnerable. Server-side rendering or static generation is the most reliable way to eliminate this gap.
Noindex and robots.txt leakage
A misconfigured robots.txt or a noindex meta tag accidentally deployed to production can deindex your site within a few crawl cycles. Google respects these directives — they exist to prevent indexing of staging environments and private pages. When they leak to production, Google follows the instruction and stops indexing. The VP Watchtower SEO check detects noindex directives and flags them immediately.
Canonical tag confusion
Canonical tags tell Google which version of a URL is authoritative — www vs non-www, https vs http, trailing slash vs no slash. Incorrect canonicals point Google at the wrong URL, which can prevent indexing entirely. A page that canonicalises to a 404 URL will not be indexed. Checking canonical tags is part of a thorough SEO audit.
PageSpeed from Google's perspective
Your local broadband connection and cached browser assets make your site feel fast to you and slow to a first-time visitor on a mobile network. Google's PageSpeed Insights measures performance from simulated mobile conditions on a throttled connection — this is closer to the experience of a new visitor discovering you via search. That is why PageSpeed scores often surprise developers who experience the site on high-spec hardware.
Monitoring what Google actually sees
The VP Watchtower SEO check uses the PageSpeed Insights API — the same tool Google uses to evaluate performance — and checks your live HTML for critical SEO signals. This gives you a regular snapshot of what an external crawler sees, not what your logged-in, cached browser session shows you.