Speed
My website is slow — 9 causes and immediate solutions
9 June 2026 · 7 min read
A slow website is more than just annoying — it directly costs you money. Research shows that 53% of mobile visitors leave a website that takes longer than 3 seconds to load. Moreover, speed is an important ranking factor for Google: slow websites score lower in search results.
At WP Maintainer, with our 20+ years of experience in web development, we have seen virtually every speed problem. In this article we discuss the 9 most common causes of a slow WordPress website, with concrete solutions you can apply immediately.
Cause 1: Too many or heavy plugins
This is by far the most common culprit. Every plugin adds code to your website. Some plugins — especially multifunctional page builders and SEO tools — load dozens of CSS and JavaScript files on every page, even where they are not needed.
Cause 2: Unoptimised images
Large images are responsible for 50-80% of total page size. Many website owners upload photos directly from their camera or phone, resulting in files of 5-10 MB.
Cause 3: No caching
Without caching, your server must regenerate the entire page on every visit. This costs valuable seconds, especially with complex WordPress websites.
Cause 4: Slow hosting package
Cheap shared hosting shares server resources with hundreds of other websites. If one website on the same server has a traffic peak, your website becomes slower.
Cause 5: Outdated PHP version
Many websites still run on PHP 7.4 or older, while PHP 8.3 offers 30-40% faster processing. Every new PHP version contains significant performance improvements.
Cause 6: No CDN
Without a Content Delivery Network, all files are loaded from one server location. Visitors from other countries therefore experience longer loading times.
Cause 7: Bloated database
Over time, your WordPress database accumulates hundreds of revisions, spam comments, temporary files and deleted content. This makes queries slow.
Cause 8: External scripts
Google Analytics, Facebook Pixel, chat widgets, review widgets — every external script adds loading time. Some external services are slow and delay your entire website.
Cause 9: Heavy or outdated theme
Multifunctional themes and page builders often load dozens of CSS and JS files. An outdated theme can also cause compatibility problems that affect performance.
Free speed analysis
Want to know why your website is slow? WP Maintainer performs a free speed analysis with concrete improvement suggestions. Contact us via WhatsApp (+31 6 16073661) and we will help you immediately.