Definition
Landing page speed is how quickly a landing page becomes usable and visible after a click. It directly affects conversion rate.
Example
A 2s LCP page converts better than a 5s LCP page at the same traffic quality.
How to use it
- Measure on mobile first; most paid traffic is mobile.
- Speed improvements compound with creative and offer wins.
- Track Core Web Vitals to catch regression after releases.
- Audit third-party tags; they often cause the biggest slowdowns.
Common mistakes
- Optimizing only time-to-first-byte while LCP remains slow.
- Ignoring page weight from analytics tags and heavy images.
- Testing speed on desktop only while mobile traffic dominates.
- Launching new scripts without measuring impact on LCP and CLS.
Measured as
Measure Landing Page Speed with a fixed attribution window, conversion event, and spend basis before comparing campaigns or creative tests.
Misused when
- Optimizing only time-to-first-byte while LCP remains slow.
- Ignoring page weight from analytics tags and heavy images.
- Testing speed on desktop only while mobile traffic dominates.
- Launching new scripts without measuring impact on LCP and CLS.
Operator takeaway
- Measure on mobile first; most paid traffic is mobile.
- Speed improvements compound with creative and offer wins.
- Track Core Web Vitals to catch regression after releases.
- Use Landing Page Speed only inside a stable attribution rule, conversion definition, and time window so campaign comparisons stay honest.
- If performance changes, check whether the metric moved for a real business reason or because the measurement setup changed underneath you.
Next decision
- Read Creative + landing page playbook: diagnose CTR/CVR, then set break-even targets if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
- Decide which report owns Landing Page Speed before comparing campaigns, channels, or creative tests.
Where to use this on MetricKit
Guides
- Creative + landing page playbook: diagnose CTR/CVR, then set break-even targets: A practical playbook for improving paid ads performance: use CTR/CVR diagnosis, set break-even CTR/CVR/CPM targets from your economics, and fix the biggest lever first.