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PerformancePage speed

Why Your SaaS Website Is Slow on Mobile, and How to Fix It

Seven of ten funded SaaS sites we audited took over 4 seconds to show their main content on mobile. What LCP means, what causes it, and how to fix it.

Muhammad Yousaf
Founder, Vura Digital · 6 min read
Performance
Page speed
Key Takeaways
  • Google treats Largest Contentful Paint (LCP) of 2.5 seconds or less as good and over 4 seconds as poor, measured at the 75th percentile of visits.
  • In our October 2026 audits of ten recently funded SaaS sites, seven took longer than 4 seconds to show their main content on a simulated mid-range phone.
  • The usual causes are slow server response, a hero image or video that starts loading late, and heavy JavaScript from animations and third-party tags.
  • Most fixes do not need a redesign: compress and preload the hero image, defer scripts, and cut third-party tags.

Your SaaS homepage probably looks great on a laptop. On a phone, it may take several seconds before visitors see anything worth reading. That is when many of them give up, and Google notices too.

In October 2026 we audited ten recently funded SaaS companies’ websites with Google PageSpeed on a simulated mid-range phone. Seven of the ten took longer than 4 seconds to show their main content, and the slowest took over 16 seconds. These were well-funded teams with good-looking sites.

What LCP means

Largest Contentful Paint (LCP) is the time from when someone opens your page until the biggest piece of content in view, usually the hero heading, image or video, has appeared. It is one of Google’s three Core Web Vitals.

Google’s thresholds are:

LCPRating
2.5 seconds or lessGood
2.5 to 4 secondsNeeds improvement
Over 4 secondsPoor

Google measures this at the 75th percentile of real visits, so three out of four visitors should see your main content within 2.5 seconds.

Want to know where you stand? Run your homepage through our free website audit. It runs Google PageSpeed on mobile, shows your main content load time against these thresholds and lists the fixes in plain English.

What we found in ten SaaS sites

The ten sites were a mix of Webflow, Framer, Next.js and custom builds, all from companies that announced funding in October 2026. Measured on a simulated mid-range phone:

  • 3 sites showed their main content in under 2.5 seconds
  • 7 sites took over 4 seconds, and 4 of those took over 8 seconds
  • The fastest took 0.9 seconds and the slowest 16.1 seconds

These are lab tests from single runs, so real visitors may see different numbers. But a lab result of 8 seconds or more almost always means real mobile visitors are waiting too long.

The four usual causes

Google breaks LCP into four parts. Slow sites usually lose time in one or two of them.

1. Slow server response

Before anything loads, the browser waits for your server to send the page. Google’s own data shows that for at least half of the sites with poor LCP, server response alone took long enough to make a good LCP nearly impossible. Hosting on a CDN, caching pages and avoiding chains of redirects all help.

2. The hero image starts loading late

Google found that the median site with poor LCP spends almost four times as long waiting to start downloading its main image as actually downloading it. Common reasons are hero images set as CSS backgrounds, lazy-loading on the first image, or images added by JavaScript after the page loads.

3. Heavy images and video

A 3 MB hero image or an autoplay background video can take seconds on a phone connection. Compress images, serve modern formats like WebP or AVIF at the right size, and use a still poster image instead of autoplay video on mobile.

4. Too much JavaScript

Animation libraries, chat widgets, analytics, A/B testing and tag managers all compete for the phone’s processor. Each one may be small, but together they can block the page for several seconds.

How to fix it, by platform

Webflow: compress images before upload and use Webflow’s responsive images, avoid lazy-loading the hero image, keep Interactions on the first screen light, and move third-party scripts to the end of the body or load them after interaction. Our Webflow SEO checklist covers the settings side.

Framer: use Framer’s image optimization, avoid oversized hero videos, and limit heavy scroll animations above the fold.

WordPress: use a quality host with page caching, remove unused plugins, and serve optimized images. Our WordPress speed optimization guide goes deeper.

Next.js and custom builds: use the framework’s image component with priority on the hero image, server-render the first screen, and split JavaScript so the first view loads only what it needs.

Want a faster site without a redesign? We fix speed, SEO and accessibility issues on Webflow, Framer and custom builds.Explore Webflow Development

Does it actually matter?

Speed is not just a score. The Economic Times reported cutting its LCP from 4.5 to 2.5 seconds and saw an overall 43 percent better bounce rate. For a SaaS site, every visitor who leaves before your headline loads is a demo request you never see.

“Most slow SaaS sites do not need a redesign. They need a smaller hero image, fewer scripts and a few hours of careful fixes.”
Vura Digital

Check your site in a minute

  1. Run your homepage through the free website audit.
  2. Look at the main content load time and the top fixes it lists.
  3. Fix the hero image and scripts first, then run it again.

If you want help, we can go through the report with you on a free call.

Sources

About Vura Digital

Vura Digital is a web design and development studio and Webflow Premium Partner for SaaS and tech startups. We design and build marketing websites on Webflow, WordPress and Framer, custom web apps with Astro and Next.js, and cross-platform mobile apps with Flutter, we automate the workflows between your tools with Make, Zapier and n8n, and we build AI agents, assistants and internal AI platforms with Claude and OpenAI. Since 2021, we have delivered 120+ projects for teams including Lightly AI, Kota, Volta and Sope.

Related services: Webflow Development, Custom Web Development.

Frequently asked questions

Google's guidance is 2.5 seconds or less for at least 75 percent of page visits. Between 2.5 and 4 seconds needs improvement, and over 4 seconds is poor.

Phones have slower processors and often slower connections. Heavy JavaScript, large images and animation libraries that feel instant on a laptop can take several seconds to process on a mid-range phone, which is what Google's mobile tests simulate.

Core Web Vitals, including LCP, are part of the page experience signals Google uses. They rarely outrank relevance, but on competitive searches a slow page is at a disadvantage, and slow pages lose visitors before they convert.

Run Google PageSpeed Insights, or use our free website audit, which runs PageSpeed on mobile and adds SEO, accessibility and AI search checks with a plain-English fix list.

Yes. Both host on fast global CDNs. Slow Webflow and Framer sites are usually slowed down by oversized images, heavy animations, autoplay video and third-party scripts, all of which can be fixed.

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