Are you just getting started with a WordPress website for your business? Want to ensure you aren’t missing any WordPress optimisation and security opportunities?

We share 8 WordPress mistakes to avoid in this infographic.

Here’s a quick summary:

• Using poorly-coded themes
• Installing excessive plugins
• Not optimising media
• Omitting an XML sitemap
• Skipping updates
• Overlooking Security
• Not Implementing Backups
• Not properly configuring permalinks

Check out the infographic for more detail.

 

If you’re building a website with WordPress, you’re not alone—it’s the most popular content management system in the world. But just because it’s user-friendly doesn’t mean it’s mistake-proof. Whether you’re a beginner or even a seasoned site owner, it’s easy to overlook some key web design basics that can impact your site’s performance, security, and success.

From clunky themes to skipped updates, certain common mistakes can cause your site to load slowly, rank poorly in search engines, or even get hacked. The good news? Every one of these mistakes is fixable.

In this post, we’ll walk through eight of the most common WordPress mistakes—and show you exactly how to avoid or correct them.

Using Poorly-Coded Themes

Your WordPress theme sets the foundation for your entire website—from design and layout to speed and SEO. But not all themes are built with performance in mind. Poorly-coded themes often come packed with unnecessary scripts and bloated files, slowing your site down. If you’re serious about performance and ranking well in search engines, your theme needs to be fast, clean, and reliable.

• Choose themes from reputable developers with good reviews and regular updates.
• Test theme speed with tools like GTmetrix or PageSpeed Insights before going live.
• Avoid themes overloaded with built-in features you don’t need—use plugins instead.
• Stick to lightweight themes optimised for performance and SEO, like GeneratePress or Astra.

Installing Excessive Plugins

Plugins are one of WordPress’s biggest strengths—but also one of its biggest risks when misused. While it’s tempting to install a plugin for every new feature, having too many can bog down your site and lead to conflicts. More plugins mean more code to load, more potential security gaps, and more things to go wrong. The key is to only use what’s essential.

• Audit your plugin list and remove anything that isn’t absolutely necessary.
• Look for multifunctional plugins that consolidate features into one tool.
• Avoid outdated or rarely updated plugins—they pose serious security risks.
• Test your site speed after installing any new plugin to monitor performance impact.

Not Optimising Media

Images, videos, and other media bring your site to life—but if they’re not properly optimised, they can kill your load times. Uploading massive image files straight from a camera or stock library is one of the most common beginner mistakes. The bigger the file size, the longer the page takes to load. Optimising media is one of the easiest ways to boost speed and user experience.

• Resize images before uploading using tools like TinyPNG or Squoosh.
• Use appropriate file formats—JPEG for photos, PNG for transparent graphics.
• Install a WordPress image optimisation plugin like Smush or ShortPixel.
• Lazy-load images so they only load when they come into the user’s view.

Omitting an XML Sitemap

An XML sitemap acts like a roadmap for search engines, guiding them to the most important pages on your website. Without one, search engines may miss valuable content, slowing down your visibility in search results. WordPress doesn’t generate one by default, which means it’s up to you to make it happen. Luckily, it’s easy to fix with the right plugin or tool.

• Use SEO plugins like Yoast or Rank Math to automatically generate an XML sitemap.
• Submit your sitemap to Google Search Console and Bing Webmaster Tools.
• Keep the sitemap updated as you add or remove pages from your site.
• Exclude pages you don’t want indexed, like admin pages or thin content.

Skipping Updates

Failing to update WordPress core, themes, or plugins can leave your site vulnerable to bugs, performance issues, and serious security threats. Developers regularly release updates to fix problems and add new features. Ignoring them is like leaving your front door wide open to hackers. Updates might seem minor, but they’re critical to your site’s long-term health.

• Set a regular schedule to check for and install updates—weekly if possible.
• Back up your site before running major updates to prevent data loss.
• Use a staging site to test updates before applying them to your live site.
• Turn on automatic updates for minor plugin and theme updates when safe.

Overlooking Security

Security is often an afterthought for new WordPress users, but it should be a top priority. WordPress is a popular platform, which unfortunately makes it a target for hackers and bots. You can’t make your site completely hack-proof, but you can make it a lot harder to break into. A few simple measures go a long way in protecting your site and your visitors.

• Don’t use “admin” as your username—choose something unique and hard to guess.
• Install a security plugin like Wordfence or iThemes Security for added protection.
• Enable Two-Factor Authentication (2FA) to secure your login page.
• Limit login attempts to block brute-force attacks.

Not Implementing Backups

Backups are your safety net. Whether it’s a hack, human error, or plugin conflict—something will go wrong eventually. Without a recent backup, you risk losing everything. The good news is that automated backups are easy to set up and don’t require much technical knowledge. They’re a small effort with huge peace-of-mind value.

• Use a backup plugin like UpdraftPlus or BlogVault to schedule regular backups.
• Store backups in a secure offsite location like Dropbox or Google Drive.
• Test your backups occasionally to ensure they restore properly.
• Back up both your files and database, not just one or the other.

Not Properly Configuring Permalinks

The default WordPress permalink settings aren’t very user-friendly or SEO-friendly. URLs that include numbers or question marks don’t give any clue about the content of the page. Clean, readable URLs are easier for search engines to understand and for users to remember. Changing your permalink structure early in the design process saves you trouble down the line.

• Change the permalink setting to “Post name” under WordPress Settings > Permalinks.
• Avoid using dates in your URLs unless you run a news or event-based site.
• Use hyphens (not underscores) to separate words in URLs.
• Keep URLs short, descriptive, and relevant to your content.

Final Thoughts

Getting started with WordPress is easier than ever, but that ease also opens the door to costly mistakes—especially when it comes to web design basics. From bloated themes to missing security measures, each of the issues above can slow your site down, damage your SEO, and frustrate your visitors.

Thankfully, most of these problems are fixable with a bit of effort and the right tools. Whether you’re building your first site or giving an old one a refresh, focusing on clean code, minimal plugins, fast media, and strong security practices can make all the difference.

By avoiding these 8 common WordPress mistakes, you’ll not only create a more professional and polished website—you’ll also give your users a faster, safer, and more enjoyable experience. And that’s the real foundation of effective web design.