Technical SEO Checklist: 15 Things That Could Be Killing Your Rankings

Technical SEO problems rarely announce themselves. Your site keeps running, visitors still arrive, and nothing looks broken on the surface, while Google quietly struggles to crawl, index, or trust key pages. Here are the 15 issues we find most often when auditing a small business site that has stalled on rankings for no obvious reason.

Crawling and Indexing Issues

1. Pages blocked in robots.txt by accident. A leftover line from a development site can quietly block your whole blog or product catalog from being crawled.
2. Missing or incorrect XML sitemap. If your sitemap still references deleted pages or is missing new ones, Google finds new content slower than it should.
3. No canonical tags on duplicate pages. Product filters, URL parameters, and print versions can create dozens of near-identical pages competing against each other.
4. Orphan pages with no internal links. A page nothing links to is much harder for Google to find and much harder for it to trust.
5. Soft 404s. A "page not found" message that returns a 200 status code tells Google the page is fine when it isn't, wasting crawl budget on dead content.

Speed and Core Web Vitals

6. Unoptimized images. A single uncompressed hero image can add two or three seconds to load time on mobile.
7. Render-blocking scripts. Plugins and tracking codes that load before the visible content delays everything the visitor actually came to see.
8. No browser caching or CDN. Repeat visitors reloading the entire site from scratch every time is a solvable, often ignored problem.
9. Layout shift from ads or late-loading elements. If buttons move around as the page loads, Google scores that as a poor experience and so do your visitors.

Mobile and Structure

10. Non-responsive design. Over half of search traffic is mobile, and Google evaluates your mobile version first, not your desktop one.
11. Intrusive pop-ups on mobile. A newsletter pop-up that covers the whole screen before someone reads a word can actively hurt rankings.
12. Broken internal links. Every 404 a visitor hits chips away at trust, and Google notices the pattern too.
13. Missing or duplicate title tags and meta descriptions. These are still one of the clearest signals you give Google about what a page is actually about.

Security and Trust Signals

14. No HTTPS, or mixed content warnings. Browsers now flag non-secure pages directly to visitors, and Google has used HTTPS as a ranking signal for years.
15. Thin or auto-generated pages left indexed. Old tag pages, empty category pages, or test pages left live and indexed dilute the overall quality signal Google assigns to your domain.

How to Actually Work Through This List

Don't try to fix all 15 in one afternoon. Start with a free crawl using Google Search Console's Pages report, which will surface most of the indexing issues directly. Then run PageSpeed Insights on your three or four most important pages, since site-wide speed problems usually show the same pattern everywhere. Fix robots.txt and sitemap issues first, because those affect whether Google can even see your other fixes.

A local tailoring business we worked with had an entire services section blocked by a single stray line in robots.txt left over from a 2019 site migration. Once removed, those pages started appearing in search results within about two weeks, simply because Google could finally read them.