The technical SEO checks most websites miss

Technical SEO doesn’t always ‘get its flowers.’ Content and keywords get the glory, and link building gets all the budget – and so they should! But technical SEO is often the quiet foundation holding everything together. And when that foundation has cracks, no amount of brilliant content, or the perfect keyword, or grabbing the Forbes backlink will fix the problem.

When you’ve been crawling a site for what seems like hours, and it’s spitting out issues that you have no concept of – in fact, you’d be better off learning Ancient Greek than knowing whatever a DNS Configuration Error or Layout Shift Culprit is – technical SEO can be easy for someone to ignore. But that’s what causes issues, and sometimes big ones, that can cost you a lot when it comes to rankings. 

A lot of businesses pour time and money into content creation and backlinks, then wonder why rankings stall or organic traffic refuses to grow. More often than not, the issue is not content quality. It is technical barriers quietly blocking search engines from properly crawling, indexing, or understanding the site.

You could have the SEO equivalent of a Shakespearean sonnet on your landing page, but if it’s not indexed properly – no one is reading it. 

So what are the technical SEO checks that most websites overlook? And how do you fix it? 

Why some technical issues stay hidden

Websites evolve constantly – as they should to keep up with what feels like never ending changes in digital. New plugins get added to improve user experience, CMS updates roll out, your web developers might make small tweaks to tracking and code. You bring a marketing team in, adding tracking scripts and other improvements. Over time, complexity builds up – and that’s how wires get crossed. 

On the surface, everything may look fine. Pages load well enough, users can navigate between pages – rankings might even look decent. 

But underneath, there could be crawl inefficiencies, rendering issues, or indexing conflicts quietly limiting performance. 

If a site ranks reasonably well despite technical flaws, these things go unnoticed. The focus stays on visible metrics like traffic and conversions rather than the deeper infrastructure powering it all – and that could be preventing your site from the growth it deserves. 

Technical SEO is like the engine beneath the car hood. You unplug certain wires, start messing with things too much – and suddenly you find that your website is breaking down, like a car stalling on the side of the road. 

And just like a car, the website doesn’t need a new paint job, or funky eyelashes on the headlights, or a new license plate. You need to look at the engine.

The real cost of ignoring technical SEO

When technical issues get ignored, rankings suffer, and user experience TANKS. 

95% of search traffic goes to the first page of results. If your site struggles to crawl properly or wastes crawl budget, it becomes much harder to compete for those top positions. Google favours websites that are properly optimised – and if the technical side of your website is being neglected, the Google Spiders/Bots/Crawlies can tell. 

Technical SEO is not just about optimisation. Good technical SEO removes the barriers that are preventing your website from gaining the amazing results it possibly can. 

So what are the worst offenders for preventing a website from becoming the best it can be? We’ve narrowed it down to the following issues – so you can keep an eye out during your next audit.

Crawlability and indexing 

Most people briefly check robots.txt, and submit a sitemap. That’s a good start – but it’s not enough to leave it there.

Log file analysis

Log files show you exactly how search engine bots interact with your site. Not what you think they crawl, but what they actually crawl.

You can spot wasted crawl budget, discover whether important pages are being ignored, and identify unexpected errors. On large sites, such as ecommerce sites with lots of product pages, this is where major opportunities often hide.

If Google is spending its time crawling low value URLs instead of high priority pages, that is a problem worth fixing.

JavaScript rendering

Modern websites rely heavily on JavaScript – great for user experience, but it can create problems for search engines.

If your content relies entirely on client side rendering, there’s a risk that search engines do not fully process it.

This means carefully written content could exist on the page but still not be properly indexed.

Always check how your site renders to search engines, not just how it looks in a browser. The way search engines read your site matters just as much as how real-life users look at it. 

Orphan pages

Orphan pages are pages that exist on your site but are not linked internally from anywhere else – meaning they’re just floating around on your website. Users won’t be able to find them through navigating your site normally – and they won’t be recognised by Google as much as if they were linked to from other pages. 

If there are no internal links pointing to them, search engines may struggle to find or prioritise them. Even if they are listed in your sitemap, they receive no internal link equity.

A proper crawl analysis can reveal orphaned content so you can integrate it properly into your internal linking structure.

Performance issues 

Page speed matters, but there is more to performance than a green score or mark from any testing tool. 

Google is basically an impatient user, looking to see how quick your pages load with stopwatch ready. 

If your site loads slowly, users bounce before they even see how brilliant your content is, and search engines make a note of it. 

A fast site keeps visitors happy, lowers bounce rates, boosts engagement, and makes it easier for search engines to crawl and index your pages efficiently. With Core Web Vitals in the mix, speed isn’t just an optional extra – it directly impacts your rankings. 

Server performance 

Server response time plays a big role in overall performance. If your hosting is slow or overloaded, your site will suffer. 

Shared hosting can introduce unpredictable slowdowns. 

Optimising hosting and server performance creates a solid base for everything else – and it definitely shouldn’t be ignored when you’re looking at technical health. 

Hidden CSS and JavaScript bloat

Over time, websites build up unused CSS and JavaScript, and it can wreak havoc on your loading speed.

Old plugins not being used anymore leave behind scripts. Themes load styles that are no longer needed. The result is unnecessary weight that slows rendering and impacts Core Web Vitals like Largest Contentful Paint and Interaction to Next Paint.

Cleaning up unused code can deliver measurable improvements.

Massive images 

We get it – if you’re an ecommerce site selling products, you want your images to be as high-resolution as possible. However, image size has a direct impact on page speed and overall user experience. If images are too large or not properly compressed, they can significantly slow down load times.

There are ways to improve this without compromising on user experience. Optimising image dimensions and compressing files helps keep pages fast and efficient, and shouldn’t be ignored when you’re carrying out technical SEO checks. 

Structural integrity 

Search engines rely on clear signals – but subtle structural issues can create confusion, resulting in crossed wires.

By ignoring some of these issues, you’re sending the completely wrong message to Google.

When Google can’t figure out what a proper structure for your site is, it works against you. Being eagle-eyed about structural issues like this can make a huge difference when it comes to gaining key wins. 

Redirect chains and loops

Redirects are a normal part of most websites – but chains and loops are not.

If Page A redirects to Page B, which redirects to Page C, you waste your crawl budget, and risk losing link equity. Long, ongoing chains can weaken rankings over time as you’re not showing a strong structural map – and Google will penalise you for it. 

Keep redirects clean and direct to maintain authority flow, and improve the structure of your site. 

Hreflang errors

International SEO gets complicated quickly.

Incorrect language codes, missing return tags, or conflicts with canonical tags can prevent the right content from appearing in the right country. If you’ve got a global market, this can have an incredibly negative impact on your rankings. 

Make sure to double check that every version of your site is working properly in every market you cater for, so that your rankings stay put no matter where users are coming from. 

Subtle duplicate content issues

Duplicate content is not always obvious – and it doesn’t need to just be copycat content either. 

Session IDs, URL parameters, and tracking codes can create multiple versions of the same page. Without proper canonicalisation, search engines may struggle to determine which version is the ‘right’ one. 

This can dilute ranking signals and reduce overall performance, making your website read as ‘spammy.’ When you find duplicate content issues, make sure to investigate – don’t just ignore it!

Modern SEO challenges

We’ve seen a lot of changes to SEO recently. Websites evolve and will continue to do so, AI will change the landscape even more than it already has done. That’s SEO – it’s evolved constantly since 1998, and it shows no signs of slowing down. 

That’s why it’s important to never ignore modern changes. Here are two more big issues that you should never ignore when looking at technical SEO.  

CMS technical debt/plugin conflicts

Platforms like WordPress are powerful but can accumulate technical debt.

Outdated plugins, poorly coded themes, and plugin conflicts can slow down performance, introduce errors, and create indexing problems. Sometimes, a plugin will update and can transform your website behind-the-scenes, so it’s important to always stay on top of them all. 

Regular technical SEO audits keep things under control, allowing you to spot issues before they start really messing up the back-end. 

Structured data 

Structured data helps search engines understand your content and unlock rich results – and in the new world of AI search, you need to be on top of your schema markup. 

But missing properties, incorrect schema types, or conflicting markup can prevent those enhancements from appearing. Schema audits and keeping track of all the schema uploaded to your website are crucial to making sure that your schema markup is working properly. 

Implementation needs to be accurate and consistent to deliver value on both traditional search engines and AI platforms. Otherwise, it’s just a bunch of useless code. 

What to prioritise first?

The most important thing to remember about technical SEO is that it is not a one time checklist that you can complete and then forget about. It is continuous maintenance.

It truly is like running a car – you can’t take it to the mechanic’s once and then leave it forever. It needs continuous checks and updates to keep your website running smoothly.

Organic search contributes a significant portion of overall traffic across industries. Marketers consistently report that SEO positively impacts business performance. But those results rely on a strong technical foundation.

No part of technical SEO can be ignored if you want great rankings and performance.  

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