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If you want to know how to speed up wordpress website, you have probably seen the same advice recycled everywhere: install a caching plugin, compress your images, use a CDN. That advice is not wrong — but it is incomplete. For most WordPress sites I work on, the real problems are different, and knowing how to speed up a WordPress website properly goes much deeper than a plugin install.
I have been doing WordPress performance optimisation for six years across dozens of Irish business sites. Here is what actually moves the needle — and what wastes your time.
Why WordPress Sites Slow Down (The Real Reasons)
Most slow WordPress sites are not slow because of WordPress itself. They are slow because of decisions made during setup — shared hosting, unoptimised images, plugins that clash, and themes loading three times more CSS and JavaScript than the site actually needs. When businesses ask me how to speed up WordPress website, the answer almost always comes down to one or more of these four culprits.
- Unoptimised images. A client recently had a 4MB hero image loading at full resolution on mobile. Nobody had ever compressed it. That single issue dropped their PageSpeed score by 30 points.
- Too many plugins doing the same job. I have seen sites with five SEO plugins installed simultaneously. Each one adds scripts, database queries, and overhead.
- Page builder bloat. Elementor, Divi, WPBakery — these tools load significant weight on every page. A custom-built theme loads a fraction of the code for the same visual result.
- Cheap shared hosting. If you are paying €5 per month for hosting, that is precisely what you are getting in terms of server speed.
How to Speed Up WordPress Website: 5 Proven Fixes
1. Fix Your Images First
Images are usually the single biggest win when you want to speed up a WordPress website. Every image should be compressed (ShortPixel or Imagify are the two best tools), served in WebP format where the browser supports it, correctly sized for where it appears on screen, and lazy-loaded below the fold. A properly optimised image library typically cuts total page weight by 60–70%. According to Google’s web.dev guidance, image optimisation is consistently one of the highest-impact improvements available.
2. Set Up Proper Caching
A caching plugin generates static HTML files so WordPress does not have to rebuild the page from the database on every visit. This alone can halve load times for content-heavy sites. WP Rocket costs €49 per year and is the most reliable option I have used. LiteSpeed Cache is a strong free alternative if your host supports it — check before installing, as the two do not work well together.
3. Sort Out Your Fonts
Google Fonts add DNS lookups and render-blocking requests on every page load, even when only one or two characters on the page use that font. Self-hosting your fonts, or limiting yourself to one or two font families maximum, removes this overhead cleanly and measurably.
4. Audit and Trim Your Plugin List
Open your plugin list and ask honestly: what does this actually do, and do we still need it? Every active plugin loads code on every page request, whether or not that page uses that plugin’s functionality. Removing three to five unused plugins is a free, five-minute way to speed up your WordPress website with no technical knowledge required.
5. Upgrade Your Hosting
Server speed is the ceiling everything else operates within. I have moved sites from shared hosting to managed providers — Kinsta, WP Engine, SiteGround — and seen PageSpeed scores improve by 20 or more points from that change alone, before touching anything else. Managed WordPress hosting typically costs €20–40 per month and is worth it for any site generating business enquiries.
What Core Web Vitals Actually Measure
Understanding how to speed up WordPress website properly means understanding what Google is actually measuring. Google’s Core Web Vitals are three specific metrics that matter for both user experience and search rankings: Largest Contentful Paint (LCP — target under 2.5 seconds), Cumulative Layout Shift (CLS — target under 0.1), and Interaction to Next Paint (INP — target under 200ms). The score that matters most is mobile, not desktop — most Irish business sites get 80% or more of their traffic from phones.
A site that scores 90+ on mobile PageSpeed generally has all three Core Web Vitals in the green. Getting there typically means fixing images, caching, fonts, and — if needed — reducing JavaScript execution time.
How to Speed Up WordPress Website on Mobile
Mobile performance deserves specific attention. Beyond the general fixes above, mobile-specific improvements include serving correctly-sized images for small screens (not just the desktop image scaled down), deferring non-critical JavaScript, and ensuring the above-the-fold content loads without waiting for fonts or scripts. Our performance optimisation service covers a full mobile audit as standard.
When to DIY vs Hire a Developer
You can get most WordPress sites from a score of 40 to around 70 without touching code — compress images, install a caching plugin, remove unused plugins. To get from 70 to 90+, you usually need technical work: eliminating render-blocking resources, deferring third-party scripts, reducing unused JavaScript and CSS, and fixing layout shift issues. This is where a developer with performance experience earns their cost back quickly in improved rankings and conversion rates.
You can also see examples of before-and-after performance work in our project portfolio.
Running slow? We offer a free WordPress performance audit. Get your free audit →
