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SEO · Jul 2026

Technical SEO Checklist: 15 Fixes That Move Rankings

A prioritised technical SEO checklist for Singapore websites. Fix these 15 items before you spend on content or backlinks.

Technical SEO Checklist: 15 Fixes That Move Rankings

Fix these 15 things before spending money on content and backlinks. We have looked at many SMEs in Singapore and the trends are clear. There are many cases where the page content is fine, but the technical aspects of the site are messed up, and organic search traffic can increase by 20-40% in 90 days with just a technical fix. The reason is simple: Google can't index, crawl or render your site correctly, so no matter how much content you collect, it won't be as effective as it should be.

This technical SEO checklist is organized by effectiveness and amount of effort. As long as you continue from the top, you'll be fine. For each object I wrote what to check, what tools to use and where the line to skip is.

This is the content of the entry SEO Singapore 2026 guide and series on the strategy side, and this checklist is written assuming you've already read it. If you are an event or venue management company, the same indexing rules apply to event management sites.

Summary of key points

  • 47.6% of sites appearing on the first page of Google pass Core Web Vitals. The other side is 44.2%. In competitive industries, this difference increases to 7.6 percentage points (PageSpeed, 2026)
  • INP replaced FID in March 2024 and now accounts for about 40% of all Core Web Vitals signals. In 2026, the number of sites falling here is the highest.
  • LCP is 2.5 seconds, INP is 200 milliseconds, and CLS is less than 0.1 - according to the 75th percentile of real Chrome users, and all three must be cleared (Google, 2026).
  • Even on the first page of results, 52% failed Core Web Vitals. Speed is the deciding factor, not the barrier - arrange index first, then speed.

Technical SEO Checklist Items 1-4: Crawl and Index

If Google can't see your page, there's no point in doing anything else. So where exactly is the index problem?

1. Submit your XML sitemap to Search Console. Open GSC → Site Map and check if the status is "Processed" and if there are any errors. Be sure to include all your important primary URLs. After that, check the page report often. If you see "Indexed - not indexed" all at once, it's a sign that your content or the quality of your internal links is preventing you from being indexed.

2. Check if the necessary crawlers are correctly directed via the robots.txt file. In 2026, if you want to appear in AI overviews or cite LLM, you will have to open the door to AI crawlers: GPTBot, ClaudeBot, PerplexityBot, Google-Extended. When I conduct audits in Singapore, this is the most common fatal mistake I see. I forgot to remove the "Disallow: /" line that remains in the presentation environment. Take a quick look at GSC's robots.txt report.

Also, make sure the number sitemap coverage matches the number of URLs - if you're missing data without knowing it, the entire section may be lost. In the venue business, the first thing that usually disappears is event listing pages.

3. Fix 404 with 301 redirect. Navigate to an existing page with the closest content. It is not good to cut corners and send everything to the top. You can either crawl with Screaming Frog or use GSC's free feature (Pages → Not Found) to get a list. If the redirect exceeds 2 hops, the evaluation will leak, so the old URL should be pasted directly to the last page.

4. Remove accidentally added noindex tag. Make sure the page does not have "noindex" description fields or "X-Robots-Tag" titles. Be especially careful as soon as you go from stage to production or on thank you pages that you really want the search engines to see. The ``Block Search Engines'' checkbox in the WordPress settings has unintentionally caused more small and medium-sized Singaporean sites than any other algorithm update.

Technical SEO Checklist Items 5-8: Core Web Vitals

The threshold has not changed. It has been reconfirmed by the authorities: LCP is less than 2.5 seconds, INP is less than 200 milliseconds and CLS is less than 0.1. Measured by the 75th percentile of actual Chrome visits over the past 28 days (Google Search Center, 2026). Clearing all three items is a prerequisite; if you pass two and fail one, you've still failed the entire exam. So which one should I fix first?

5. Compress the images and switch to WebP or AVIF. In a June 2026 survey of 37,036 sites, 67% of sites that failed Core Web Vitals were left on LCP. In other words, loading speed is the most important thing (PageSpeed , 2026). The median loading time of LCP elements on the first page of a search is 2.1 seconds. Aim for this number. Don't settle for "it's OK if it's less than 2.5 seconds".

6. Lazy loading only applies to images below the first view. Never use it on images subject to LCP. Add fetchpriority="high" to the hero image and leave it in the original HTML. Lazily loading the largest visible element on the page is like destroying the LCP with my own hands - yet I find this hole somewhere every week.

7. Preload the important fonts and set the rest as part. Make the font self-hosted and declare "font-display: swap". It is enough to preload only 1-2 weights for the first viewing. If the gauges on the spare side are off, the page jerks when the font is changed - this is usually the cause of CLS.

8. Package CSS and JavaScript and lazy load them. INP sees all interactions during a session, not just the first. Long tasks that take more than 50ms on the main thread (usually 3rd party script build-up and tag management bloat) are the most common culprit. The median INP of the top rated pages is 152 ms. You can use this number as a guide when adjusting.

One lesson from the field. You should stop chasing Lighthouse results. You might think, "If the numbers are good, there's no problem," but that's not the case. Google looks at real CrUX data collected from real Chrome users. The difference between laboratory data and the real environment is quite large: LCP deviations are 30-40% and INP deviations are 50-80%. In fact, I've seen with my own eyes a site in Singapore that scored 95 on Lighthouse but failed miserably on Search Console's Core Web Vitals report. If you want to optimize, do it with real user data.

On-page (items 9-12)

9. One unique title tag per page, maximum 60 characters, keyword at the beginning. If you narrow the GSC performance report to "high impressions but low click-through rate", bad headlines will automatically come to mind. Using hundreds of URLs with the same name is a classic template site bad habit – it wastes your crawl budget and slows down your relevancy.

10. Meta descriptions should be no longer than 160 characters and should be written like ad copy. It's like a "storefront" that doesn't affect rankings, but catches users' attention in search results. Be sure to include the differences with other companies: Are the prices transparent, where are they located and how quickly do they respond?

11. Only one H1 on each page may match the purpose of the search. Ideally, when you see the H1, you know what this page is about, and the wording should be similar to what the applicant wrote. Also, make sure the site name doesn't end up in the H1 section of every page because of the template - this problem still occurs on many Singapore sites built with old CMS.

12. Submit internal links from high-level pages to landing pages. Top pages and popular blog articles have a lot of link power, but are often not fully utilized. The service page needs that power. GSC's "Links" report allows you to see which pages are getting backlinks and create a link from there to your service page using plain anonymous text. A practical guideline is 3–5 internal links per 1,000 words.

Schema and AI-readiness (items 13-15)

13. Add the organization's JSON-LD to the top page. Do not reveal the registered official name and logo and link your Google business profile and each SNS account as the linker sameAs. Today, where an AI refers to something depends, first, on how clearly it sees the whole - if it doesn't know who you are, there's no reason to quote it.

14. Include structured information about the service or product on the landing page. Mark what you are selling as is: write the name of the service, the price and the area covered. It is this information that Google's AI Overviews look at when preparing answers about prices and availability.

15. Publish llms.txt to allow AI crawler access. Place only one text file directly under the root of your site. By listing the main pages, you can easily find bots such as GPTBot, ClaudeBot and PerplexityBot. The job is done in a few minutes and can be used in conjunction with the robots.txt check mentioned in point 2. The research conducted by Seer Interactive in 2026 has some really telling numbers. Pages cited in AI reviews had an organic CTR of 2.07%, compared to only 0.94% for non-cited pages. In other words, mentioning AI is itself a traffic channel.

Among the Singaporean SMEs we've reviewed so far, businesses that successfully tackled items 1-12 typically recovered 20-40% of the organic traffic they would otherwise have received within 90 days. Even without adding new content. On the other hand, if the numbers don't change even after this, the problem is probably the depth of the content, not the technology. No matter how carefully you fill out the checklist, the holes in pages with little content will never be filled.

Want to try it on your site? Get a free technical audit is handled by the team in Singapore. If you want to know about the whole program, see full digital marketing service. Want to secure your paid referrals while you wait for the improvements to take effect? That's exactly what performance marketing is responsible for.

Frequently Asked Questions

What is technical SEO?

This is what technical SEO is all about. The process of ensuring that search engines can navigate your site correctly, that it is indexed, appears quickly, and that the engines can read your content. Sitemaps, Redirects, Preferred Tags, Core Web Vitals, Structured Data - they're all there for you. A June 2026 survey of 37,036 sites found that sites listed on the first page of search results had a Core Web Vitals pass rate of 47.6%, while the second page had a slightly lower 44.2% (PageSpeed , 2026).

How long do technical SEO fixes take to show results?

Once you've fixed the index issue, you should see changes in Search Console within a few days to two weeks. Core Web Vitals, on the other hand, are measured over a 28-day rolling window, so it takes 4-8 weeks for improvements to show up in real data, and rankings may not change much later. If the technical foundation of the site is inherently weak, it is not uncommon for these technical fixes alone to increase traffic by 20-40% in 90 days.

Do Core Web Vitals directly affect rankings?

Well, I guess it's just the last edition. Starting in 2021, Google will include page experience in its ranking signals. Currently, INP's share of CWV's weight is about 40%, but 52% of the results on the first page of the search are still below the standard.

Should I block AI crawlers in robots.txt?

No. The premise is that the AI will lend you. If you block GPTBot, ClaudeBot or PerplexityBot, your page will disappear from their replies. Seer Interactive's 2026 data supports this. Even on the same search results page, pages cited in the AI overview have about twice the CTR of organic search results.

What tools do I need for this checklist?

Honestly, in most cases, the free Google Search Console and PageSpeed Insights are all you need. When you need to crawl your site, install Screaming Frog and see real user data in PSI's CrUX report. This is what Google evaluates, not Lighthouse's lab output.

Sources

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