Why Your Website Must Be Fast on 3G (Especially in Mexico)

Here is a stat that should change how you think about your website: in Mexico, a significant portion of mobile users still browse on 3G or unstable 4G connections. In tourist-heavy towns like San Miguel de Allende, visitors from abroad are often on roaming data that is throttled to crawling speeds. If your website is not optimized for these conditions, you are invisible to a huge chunk of your potential customers.

What Happens to Your Website on a Slow 3G Connection?

When someone on a slow connection visits a typical WordPress site with a heavy theme, unoptimized images, and a dozen plugins, here is what they experience: a blank white screen for four seconds, then a slow trickle of content loading in the wrong order, then a layout shift that moves the button they were about to tap. Total time to usable: eight to twelve seconds. By then, they have already hit the back button.

How Do You Build a Website for Speed on Slow Networks?

Every site we build at Untold.works targets a Lighthouse performance score above 90 on simulated 3G connections. Here is how we get there.

• Static generation. Pages are pre-built at deploy time, not generated on the fly. The server sends a finished HTML file that displays immediately.
• Aggressive image optimization. We use modern formats like WebP and AVIF, serve appropriately sized images based on the device, and lazy-load anything below the fold.
• Minimal JavaScript. We ship only the JavaScript that is actually needed for the current page. No bloated frameworks, no unnecessary libraries.
• Edge deployment. The site is served from CDN nodes close to the visitor. For a user in San Miguel, that means a server in Mexico City, not Virginia.

The Business Impact

Google has published research showing that as page load time goes from one second to three seconds, bounce probability increases by 32 percent. From one to five seconds, it increases by 90 percent. For every second you shave off your load time, you are literally keeping more customers on your site.

Speed is not a technical nicety. It is a business metric. And if you serve customers in Mexico or any market where mobile connections are variable, it might be the most important metric your website has.