Google's research is unequivocal: a one-second delay in page loading cuts conversions by 7%. For a business turning over £10,000 a month, that's £8,400 a year locked away in a server response that's simply too slow.
The hidden cost of a slow site
Most business owners see site speed as a technical concern, something to hand off to a developer and forget about. In reality, speed is a revenue lever. Every extra 100 ms of load time is correlated with lower engagement, higher bounce rates, and a drop in search engine rankings.
Google has used Core Web Vitals as a ranking factor since 2021. If your site scores poorly, you're handing organic traffic to your competitors every single day.
What "fast" really means in 2026
The thresholds have moved on. Here are the metrics that matter:
- LCP (Largest Contentful Paint): under 2.5 seconds
- INP (Interaction to Next Paint): under 200 ms
- CLS (Cumulative Layout Shift): under 0.1
The majority of WordPress sites we audit fail on at least two of these. The culprits are almost always the same: unoptimised images, render-blocking scripts, and bloated page builders.
The optimisation hierarchy
If you have four hours to improve your site's performance, here's how to spend them:
- 1 hour: Compress and convert images to WebP or AVIF
- 1 hour: Audit and remove unused JavaScript
- 1 hour: Set up proper cache headers
- 1 hour: Migrate to high-performance hosting if needed
Speed isn't a feature. It's the foundation on which every other feature is judged.
The businesses that treat performance as a priority are the ones that compound their advantages over time: better SEO, better conversion rates, lower bounce rates. Those that treat it as optional are subsidising their competitors.