10 Best Practices To Speed Up Your Website

A fast website improves user experience, reduces bounce rates, and helps search engines crawl your pages more efficiently. This guide is for site owners, developers, and content editors who want practical steps that consistently reduce load time without making a site harder to maintain.

1) Measure performance with repeatable testing

Before changing anything, establish a baseline so you can tell what actually helped. Use a mix of lab testing (synthetic) and real-user data (field) where possible, and test the same page types (home, category, post, product) on both mobile and desktop. Track a small set of meaningful metrics such as Largest Contentful Paint (LCP), Interaction to Next Paint (INP), Cumulative Layout Shift (CLS), and Time to First Byte (TTFB). Google’s guidance on Core Web Vitals is a good starting reference for understanding what “good” looks like in practice.

Core Web Vitals overview (web.dev)

2) Fix slow server response time first (TTFB)

If the server takes too long to respond, everything else becomes harder. Common causes include underpowered hosting, too many heavy plugins, inefficient database queries, and missing caching. Start by checking:

• PHP version (newer supported versions usually perform better)
• Database health (optimise tables, remove unused data, reduce autoloaded options in WordPress)
• CPU/RAM limits and PHP worker capacity (especially for dynamic sites)
• Object caching (Redis/Memcached) for database-heavy pages

Improving TTFB often produces the biggest “site-wide” improvement because it affects every page and every asset request.

3) Enable full-page caching for anonymous visitors

For most content sites, the quickest win is serving cached HTML to users who are not logged in. Full-page caching reduces the need to run PHP and hit the database on every request. Implement it at one of these layers:

• Server-level caching (often the fastest and most reliable)
• Reverse proxy caching (e.g., Varnish-style setups)
• Plugin-based caching (useful if you can’t configure the server)

Make sure cache exclusions are deliberate (cart, checkout, account pages, personalised content). After enabling caching, re-test and confirm you’re getting cache hits on key pages.

4) Reduce and control third-party scripts

Analytics, ad tags, chat widgets, embedded social feeds, heatmaps, and A/B testing tools can easily become the main performance problem. Each script can add network requests, block rendering, and increase CPU work on the client device. Best practices include:

• Remove scripts that are not actively used
• Load non-essential scripts with defer or async
• Delay loading until user interaction when appropriate (e.g., chat widgets)
• Prefer lightweight alternatives and consolidate tags via a sensible plan

Speed gains here are often “free” because you are simply removing work the browser never needed to do.

5) Optimise images for size, format, and delivery

Images are frequently the largest bytes on a page. Optimise them with a consistent process:

• Resize to the maximum display size needed (don’t upload 4000px images for 800px display)
• Use modern formats where supported (WebP/AVIF) while keeping compatibility in mind
• Compress aggressively for photographs; be more conservative for UI screenshots
• Use responsive images (srcset) so mobiles download smaller files

Also ensure images have explicit width and height attributes to reduce layout shifts and improve perceived stability.

6) Minimise CSS and make rendering cheaper

Large CSS files slow down rendering because the browser must download and parse CSS before it can paint content correctly. Aim for:

• Remove unused CSS (common with page builders and large frameworks)
• Split “critical” above-the-fold styles from the rest if your setup supports it
• Avoid heavy visual effects that trigger expensive painting (large shadows, blur filters used everywhere)
• Keep your CSS architecture simple to prevent bloat over time

Even small reductions in CSS size can noticeably improve mobile rendering.

7) Reduce JavaScript where possible (and ship less by default)

JavaScript is often the biggest reason pages feel slow, even when network speed is good. Beyond file size, JavaScript costs CPU time to parse, compile, and execute. Practical steps:

• Remove unused libraries and plugins
• Avoid loading big UI frameworks if you only need a couple of components
• Code-split or conditionally load scripts for specific templates only
• Prefer simple HTML/CSS solutions over JS-driven interactions

Less JavaScript typically improves INP and makes pages feel more responsive on mid-range phones.

8) Use a CDN and good caching headers for static assets

A Content Delivery Network (CDN) can reduce latency by serving images, CSS, and JavaScript from locations closer to the user. Even without a CDN, you should set sensible caching headers so browsers can reuse assets between page views:

• Long cache lifetimes for versioned assets (e.g., app.abc123.css)
• Shorter caching for unversioned files, or fix your build so assets are versioned
• Compression enabled (Brotli or Gzip) for text assets

Done properly, returning visitors load pages much faster because the browser already has most assets stored locally.

9) Optimise fonts to avoid blocking and layout shifts

Web fonts can delay text rendering and cause visible swapping. Use only the font weights you actually need, subset character sets where appropriate, and prefer modern formats. Consider:

• Limit to 1–2 font families and a few weights
• Use font-display: swap to prevent invisible text
• Preload the most important font files if they are critical to the design

Font work can meaningfully improve LCP and reduce CLS if fallbacks are configured sensibly.

10) Keep the page “light” by simplifying templates and content blocks

Performance isn’t only technical; it’s also editorial and structural. Pages overloaded with sliders, large embeds, auto-playing videos, and multiple tracking pixels will always be harder to make fast. Maintain speed by:

• Using fewer heavy widgets (carousels, animated counters, bulky embed blocks)
• Replacing auto-embeds with click-to-load previews
• Splitting very long pages when it helps navigation and load behaviour
• Auditing page templates regularly to prevent “feature creep”

A simple, consistent page structure reduces bytes, reduces CPU work, and usually improves readability too.

Quick checklist to apply today

• Turn on full-page caching for anonymous users
• Compress and resize your top 20 traffic-driving images
• Remove or delay at least one third-party script
• Confirm your static assets are cached properly and compressed
• Re-test the same pages and compare results against your baseline