Technical SEO Checklist: 15 Things Killing Your Rankings

Quick answer: Technical SEO problems — slow load times, missing meta tags, broken mobile rendering, unindexed pages, missing structured data — quietly cap how well even great content can rank. This checklist covers the 15 issues we find most often, in the order we check them.

Why technical SEO gets ignored

Content gets attention because it's visible — you can read a blog post and judge it. Technical SEO is invisible by design. Nobody looks at a site and thinks "I bet this has a redirect chain problem." But search engines notice, and so does every visitor waiting for a page to load.

Here's the checklist, roughly in the order of impact we see most often.

1. Page speed (Core Web Vitals)

Google uses Core Web Vitals — Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift — as a direct ranking factor. A slow site doesn't just lose visitors; it loses rank. Check yours with PageSpeed Insights and fix anything flagged red before touching anything else on this list.

2. Mobile rendering

Google indexes the mobile version of your site by default. If something looks broken, cramped, or has text too small to read on a phone, that's what's being judged — not your desktop version.

3. Missing or duplicate title tags and meta descriptions

Every page needs a unique title and description. Duplicate or missing ones are one of the most common issues we find on sites built from templates, where every page inherited the same default.

4. Broken or missing canonical tags

Canonical tags tell search engines which version of a page is the "real" one when duplicates exist (with/without trailing slash, http/https, parameter variations). Missing or incorrect canonicals can split ranking signal across multiple URLs instead of consolidating it.

5. Unindexed important pages

Check Google Search Console's coverage report. Pages you actually want ranked sometimes get accidentally excluded — via a stray noindex tag, a blocked robots.txt rule, or a broken sitemap.

6. No XML sitemap, or a stale one

A sitemap tells search engines what to crawl and how it's organized. If yours doesn't exist, or hasn't been updated since your last redesign, new pages may take far longer to get discovered.

7. robots.txt blocking things it shouldn't

A single misplaced Disallow rule in robots.txt can silently block search engines from crawling entire sections of your site. Always check this after any platform migration.

8. Broken internal links and 404s

Every broken internal link wastes crawl budget and breaks the flow of authority between your pages. Run a crawler (Screaming Frog, Ahrefs) quarterly and fix what it finds.

9. Redirect chains

A redirects to B redirects to C redirects to the actual page — each hop adds load time and dilutes link equity. Redirects should go directly to the final destination, one hop only.

10. Missing structured data (schema markup)

Structured data helps search engines — and increasingly, AI answer engines — understand what your content actually is: an article, a product, an FAQ, a review. Missing schema doesn't just hurt rich results; it hurts AI citation eligibility too.

11. Non-descriptive URLs

/page?id=4829 tells a search engine nothing. /blog/technical-seo-checklist tells it exactly what the page is about before it even reads the content.

12. Missing alt text on images

Alt text is both an accessibility requirement and a ranking signal — it's how search engines understand what an image shows, since they can't "see" it the way a person can.

13. HTTP instead of HTTPS

This should be table stakes by now, but it still turns up. HTTPS is a confirmed ranking factor and a basic trust signal — browsers actively warn visitors away from HTTP sites.

14. Thin or duplicate content across pages

Multiple pages targeting the same topic with near-identical content compete against each other instead of one strong page competing against your actual competitors.

15. No monitoring in place

Most technical SEO problems don't announce themselves — they just quietly suppress rankings until someone happens to notice traffic dropped. Search Console and a basic uptime/crawl monitor catch issues before they compound.

How to prioritize this list

Don't try to fix all 15 at once. Start with anything affecting page speed or indexing (items 1, 2, 5, 6, 7) — those block search engines from even evaluating the rest. Then move to on-page technical items (3, 4, 8, 9, 11, 12, 13). Structured data and content consolidation (10, 14) tend to be the highest-effort, so they're worth planning as a dedicated pass rather than squeezing in.

If you're not sure where your site actually stands on this list, that's the first thing we check before recommending anything else — no point redesigning a site whose real problem is a blocked robots.txt file.