Speed Is Not a Technical Problem. It's a Revenue Problem.
Most business owners think of website speed as a technical concern — something their developer worries about, not something that directly affects the bottom line.
The data disagrees.
What the Research Actually Shows
The relationship between page load time and conversion rate is one of the most studied topics in web performance. The numbers are consistent across multiple major studies:
- Akamai's State of Online Retail Performance report analyzed 10 billion retail site visits. A 100-millisecond delay was associated with conversion rates up to 7% lower. A 1-second delay was associated with conversion rates up to 22% lower.
- The Portent study measured an average 4.42% conversion drop per additional second of load time, across 20 industries.
- Amazon's internal data (widely cited) found that every 100ms of latency cost them 1% in sales.
- Walmart reported a 2% conversion increase for every 1 second of load time improvement.
The specific numbers vary by industry and audience, but the direction is uniform: faster sites convert better. The only argument is about magnitude.
The Mobile Problem Is Worse
Most of your website visitors are on a phone. And mobile performance is consistently worse than desktop performance for most business websites.
Hostinger's 2025 website load time statistics put the average WordPress site at 2.5 seconds on desktop and 13.25 seconds on mobile. That's not a typo — 13.25 seconds on a phone, which is 4.65 seconds slower than the cross-platform mobile average.
Google's own mobile performance research found that 53% of mobile users abandon a site that takes more than 3 seconds to load. A site loading in 13 seconds is not losing some visitors. It's losing the overwhelming majority of them before the page even finishes rendering.
What Google Does With Slow Sites
Beyond the direct conversion impact, slow sites can also be weaker on the page-experience signal Google uses in ranking.
Google uses Core Web Vitals as a ranking factor. Sites that pass LCP, INP, and CLS are stronger on that signal. Passing does not guarantee a boost, and failing does not guarantee a demotion.
This compounds: a slow site converts fewer of the visitors it gets, and can get fewer visitors when field data is weak, though Core Web Vitals do not decide the ranking on their own.
The WordPress vs. Next.js Speed Gap
Platform choice is the biggest determinant of baseline speed for most business websites.
Hostinger's dataset average for WordPress on mobile is 13.25 seconds. Chrome's research on top-performing sites puts Largest Contentful Paint around 1,220 milliseconds.
Next.js controls what reaches the browser: HTML on the first response, no plugin stack assembling the page per request, no database query per page view, assets served from the edge.
Akamai's online retail research associated extra seconds of mobile load time with sharply lower conversions. Next.js keeps the plugin stack and the per-request database query out of that first load.
A Realistic Example
A Las Vegas restaurant with a WordPress website loading in 8 seconds on mobile is losing most of its mobile traffic before anyone sees the menu. It can also sit behind faster competitors for searches like "restaurants near me" when field data is weak. Core Web Vitals alone do not decide those rankings.
The same restaurant with a Next.js site loading in under 2 seconds: more visitors stay, more reach the reservation flow, more complete the booking. Stronger field data can support visibility, but speed alone does not guarantee a higher ranking. The marketing spend goes further because the site actually converts.
Nothing about the design or offer changed. The site just got faster.
What Makes a Website Fast
The biggest factors in page load speed:
- Hosting infrastructure. A CDN-served static site loads faster than a server-rendered WordPress site on shared hosting
- Image optimization. Unoptimized images are the most common cause of slow load times
- JavaScript payload. Too much JavaScript blocking the initial render slows everything down
- Third-party scripts. Analytics, chat widgets, ad trackers — each one adds load time
- Platform architecture. Next.js static pages load from CDN with no database query. WordPress can match this with heavy caching, but it's an ongoing fight rather than the default
Find Out How Your Site Scores
Go to pagespeed.web.dev and run your website right now — on mobile. If your mobile performance score is below 70, the lab result is a diagnostic, not a ranking input. Slow pages still cost conversions; Google uses CrUX field data for Core Web Vitals.
Book a strategy call and we'll run a full performance audit, show you exactly where the problems are, and tell you what it would take to fix them.