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WordPress vs custom website: a technical comparison
WordPress runs on 43% of all websites, but is it really the best choice? A technical comparison on speed, security, maintenance and SEO.
The honest technical comparison
WordPress runs on 43% of all websites worldwide. It's popular, but popular doesn't always mean best. In this article we don't look at price or convenience (for that, read Build a website yourself or have it made?), but at the technical side: speed, security, maintenance and SEO.
Speed
| WordPress | Custom | |
|---|---|---|
| Average load time | 3 to 6 seconds | < 1 second |
| PageSpeed Score | 40 to 70 | 95 to 100 |
| Core Web Vitals | Often red | Green |
| JavaScript bundle | 500KB to 2MB+ | 20 to 150KB |
WordPress loads on average 5x slower than a custom website. That's down to how it's built: a WordPress site first loads the entire PHP engine, then the theme, then every installed plugin, and only then your content. On every single visit.
A custom website built with a modern framework like SvelteKit ships only what's truly needed. No empty overhead.
Want to know why speed matters so much? Read Why speed is everything and Core Web Vitals explained.
Security
WordPress is the most hacked CMS in the world. Not because it's poorly designed, but because it's so popular that it's an attractive target for hackers.
The numbers:
- 90% of all hacked websites run on WordPress
- 52% of WordPress hacks come from outdated plugins
- 11% from outdated themes
- 37% from weak passwords or WordPress core vulnerabilities
The problem is the attack surface. An average WordPress site has 15 to 30 plugins installed, and each one can contain a vulnerability. On top of that: the WordPress core, the theme, the PHP version and the database. Every link in the chain is a potential weak spot.
A custom website has no plugins, no theme system and no public admin login. The attack surface is far smaller. Our sites also ship with strict security headers (CSP, HSTS, X-Frame-Options) and run on a serverless architecture: there's literally no server to break into.
Maintenance
With WordPress you're constantly dealing with updates:
- WordPress core updates: several times a year
- Plugin updates: sometimes weekly, and updates regularly break functionality
- Theme updates: especially paid themes
- PHP version updates: required to stay secure
- Compatibility checks: does plugin A still work with plugin B after the update?
Forget an update? You're at risk of getting hacked. Push an update without testing? Your site can break. Many business owners only discover later that they're spending half a day a month on this, or paying someone else to do it.
With a custom website, maintenance is minimal and predictable. The code doesn't change on its own. There are no plugins that can break things during an update. What we do behind the scenes: keep dependencies up to date, apply security patches and monitor that everything runs smoothly, without you having to think about it.
SEO
On the SEO side, WordPress has a few inherent disadvantages:
- Slow Core Web Vitals due to plugin overhead, and Google penalises this
- Render-blocking JavaScript from themes and plugins
- Bloated HTML from page builders like Elementor or Divi
- Duplicate content issues from category and tag archives
Custom websites start with a clean slate:
- Server-side rendering for instant content
- Clean HTML without unnecessary wrappers
- Full control over meta tags, structured data and sitemap
- Perfect mobile-first from the first line of code
Want to know more about SEO in general? Read SEO basics: how to get found in Google.
When is WordPress a good choice?
We're not anti-WordPress. It can be a perfectly good choice when:
- You're running a large content site with 500+ articles and want to manage it yourself
- Your team already has WordPress experience
- You want a standard template website and don't need a unique look
- Your budget is really tight and you're willing to maintain it yourself
When custom?
Choose custom when:
- Speed and SEO matter to your business
- You want a unique look that doesn't resemble other sites
- Security is a priority (think webshops, customer portals)
- You need features no plugin can deliver
- You have no time or appetite for weekly maintenance
Our choice
At Friday Webs we don't build WordPress sites. Not out of principle, but because we believe our clients are better off with a faster, more secure and more SEO-friendly solution, at comparable or lower total cost over the lifetime of the site.
Curious what that means in your case? View our packages or start the wizard to see which package fits you.