Site speed & SEO
How fast your website loads affects where it ranks in Google — and what you can do to improve it.
Site speed is a confirmed Google ranking factor. Slow websites rank lower, lose visitors faster, and convert fewer customers — all at the same time. The good news is that speed issues are fixable, often without rebuilding your site.
Quick summary
Google measures how fast your pages load and uses this as a ranking signal. Slow pages — especially on mobile — get ranked lower. The most common causes are large images, too many plugins or scripts, and cheap hosting. We address all of these as part of performance optimization work.
Why speed matters for SEO
Google wants to send its users to websites that provide a good experience. A slow website is a poor experience. According to Google's own data, as page load time increases from 1 to 3 seconds, the probability of a visitor leaving increases by 32%. At 5 seconds, it's 90%.
Google incorporated speed into its ranking algorithm directly, and in 2021 introduced Core Web Vitals — a specific set of speed and experience metrics that affect rankings.
What is a "fast" website?
Here are rough benchmarks for page speed tools:
| Score (Lighthouse / PageSpeed Insights) | Rating |
|---|---|
| 90–100 | Good |
| 50–89 | Needs improvement |
| 0–49 | Poor |
A score of 90+ is the goal. Most business websites score in the 50–80 range before optimization work. Very unoptimized sites can score below 30.
You can test your site at Google PageSpeed Insights (search "PageSpeed Insights" and enter your URL — it's free).
What slows websites down?
The most common causes of slow pages:
Large, uncompressed images — The most common culprit. A photo straight from a camera can be 5–15 MB. Web images should typically be under 200 KB. See: Image SEO & alt text.
Too many plugins or scripts — Every plugin or third-party script adds code that must load. Bloated WordPress sites with 30+ active plugins are notoriously slow. Unused tracking scripts, chat widgets, and social media embeds all add weight.
Slow hosting — Cheap shared hosting is often slow. Managed WordPress hosts (like Flywheel, WP Engine, or Kinsta) have server-level caching and hardware optimized for WordPress performance.
No caching — Caching stores a fast, pre-built version of your pages so they load more quickly for returning visitors and regular traffic. Most WordPress sites need a caching plugin or server-level caching.
Render-blocking resources — Some JavaScript and CSS files delay the visible loading of your page. These need to be configured to load in a way that doesn't block the page content from appearing.
No CDN — A Content Delivery Network (CDN) stores copies of your site on servers around the world. Visitors load from the server nearest to them, which is faster than always loading from a single distant server. See: What is a CDN?.
What we can do to improve speed
Speed optimization is technical work. We typically address:
- Image compression and conversion to modern formats (WebP)
- Caching configuration
- Script loading optimization
- CDN setup
- Plugin audit and cleanup
- Hosting upgrade recommendations where needed
If speed is a concern for your site, ask us about a performance audit.
Core Web Vitals
Core Web Vitals are three specific speed and experience metrics that Google uses as ranking signals:
- LCP (Largest Contentful Paint) — how long until the main content is visible
- CLS (Cumulative Layout Shift) — how much the page jumps around while loading
- INP (Interaction to Next Paint) — how quickly the page responds to user interactions
You don't need to understand the technical details of these metrics. What matters is that they're measurable, improvable, and they affect rankings.
See the detailed guide in our performance section: Core Web Vitals explained.
Common questions
Related guides
- Technical SEO basics
- Mobile-friendliness & SEO
- Image SEO & alt text
- Core Web Vitals explained
- What is a CDN?
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