Landing Page Speed
Landing pages that load in under 2.5 seconds convert measurably better and earn higher Google Ads Quality Scores. Here's what "fast enough" looks like and what's slowing yours down.
Landing Page Speed
How quickly a landing page becomes usable for a visitor — measured against a 2.5-second target for Largest Contentful Paint.
Landing page speed is the time between a visitor clicking your ad or link and the page being visually complete and interactive. Google's Core Web Vitals define the threshold most teams optimise against: Largest Contentful Paint (LCP) under 2.5 seconds, Interaction to Next Paint (INP) under 200ms, and Cumulative Layout Shift (CLS) under 0.1.
Speed matters for two compounding reasons. It directly affects conversion rate — every additional second of load time drops conversion by roughly 4-7% on mobile. And it feeds into Google Ads Quality Score, which means slow pages cost more per click for the same position. Treat speed as a conversion lever, not an engineering metric.
Speed is the only landing page optimization lever that compounds with every channel you run. A faster page lifts organic conversion, paid conversion, and email-traffic conversion simultaneously — there's no segment where slow helps.
The 2.5-second target isn't arbitrary. It's the LCP threshold Google labels "Good," and it correlates with the point where bounce rate stays flat. Past 2.5s, bounce climbs sharply: a page that loads in 4 seconds bounces roughly 90% more than one at 2 seconds.
Revenue Impact = Sessions × Baseline CR × (Conversion Lift per Second × Seconds Saved) × AOV
Sessions
Monthly sessions
Landing page sessions in the period you're measuring.
Baseline CR
Baseline conversion rate
Current conversion rate of the page before the speed fix.
Conversion Lift per Second
Lift coefficient
Typical 4-7% conversion lift per second of load time removed; use 5% as a working average.
Seconds Saved
Load time delta
Difference between current LCP and target LCP, in seconds.
AOV
Average order value
Mean revenue per converted session.
A Shopify apparel store getting 120,000 monthly landing-page sessions at a 2.1% conversion rate and €68 AOV cuts LCP from 4.2s to 2.4s — saving 1.8 seconds.
Sessions: 120,000
Baseline CR: 2.1%
Conversion Lift per Second: 5%
Seconds Saved: 1.8
AOV: €68
→ ≈ €15,420 additional monthly revenue
120,000 × 2.1% × (5% × 1.8) × €68 = 120,000 × 0.021 × 0.09 × 68 ≈ €15,420. The same fix also lowers paid CPC via Quality Score — usually another 5-15% saving on Google Ads spend that doesn't show up in this number.
Three culprits cause most slow landing pages. First, unoptimised hero images: a 2.4MB uncompressed JPEG hero blocks LCP entirely. Second, third-party scripts — chat widgets, heatmap tools, multiple analytics tags, review widgets — each adding 100-400ms. Third, web fonts loaded synchronously, which delays text rendering until the font file arrives.
Typical Largest Contentful Paint (LCP) on mobile, by platform and vertical
| Segment | Fast (top 25%) | Median | Slow (bottom 25%) |
|---|---|---|---|
| Shopify — apparel | 1.9s | 3.1s | 5.2s |
| Shopify — beauty & skincare | 2.1s | 3.4s | 5.6s |
| WooCommerce — general | 2.4s | 4.0s | 6.8s |
| Magento — electronics | 2.6s | 4.3s | 7.1s |
| Headless / custom | 1.5s | 2.6s | 4.4s |
If you sit in the slow quartile, you're leaving 15-30% of your conversion potential on the table — and paying more per click on top. The biggest wins usually come from a single afternoon of work: compress and properly size the hero image, lazy-load anything below the fold, and audit your tag manager for scripts that no longer earn their place.
Landing page speed FAQ
Aim for Largest Contentful Paint under 2.5 seconds on mobile. Under 2 seconds is best-in-class. Anything over 4 seconds materially hurts conversion rate and your Google Ads Quality Score.
On mobile, every additional second of load time reduces conversion rate by roughly 4-7%. A page going from 4s to 2s typically sees a 10-15% conversion lift in absolute terms, holding everything else constant.
Yes — "landing page experience" is one of the three Quality Score inputs, and page speed is a major component. A poor landing page experience can raise your effective CPC by 20-50% versus a fast competitor bidding the same.
In order: unoptimised hero images, app-injected scripts (review widgets, upsell apps, chat tools), and synchronously loaded fonts. Each installed Shopify app typically adds 50-300ms to load time, so app sprawl is the usual root cause.
Use field data (Chrome User Experience Report, or your analytics platform's real-user monitoring) rather than synthetic lab tests alone. PageSpeed Insights shows both — the field data is what Google uses for ranking and Quality Score.
Most legacy heatmap tools add 150-500ms because they load synchronously and record the full DOM. Modern lightweight alternatives that defer recording until after page load add under 50ms. Audit each script's actual impact in the Network tab.
No — the hero is your LCP element and must load immediately. Lazy-load applies to images below the fold. The hero should be compressed, served in WebP or AVIF, and sized to the viewport so mobile users don't download a desktop-sized file.
Speed is the foundation layer of landing page optimization — there's no point A/B testing copy or layout on a page that bounces 50% of traffic before paint. Fix speed first, then run experiments on the design, offer, and messaging.
Yes, especially for pages with many small assets. HTTP/3 reduces handshake overhead and helps on flaky mobile connections — typically a 100-300ms improvement on LCP for image-heavy pages. Most modern hosts and CDNs enable it by default.
Monthly at minimum, and immediately after installing any new app, script, or tracking pixel. Speed regresses silently — a page that was 2.1s in January is often 3.5s by June after marketing has stacked new tools onto it.
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