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Metrics type: Cross-Platform Metrics • Category: Ad Platform

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At a glance

The TikTok landing pages that are slow on mobile and converting below par. TikTok traffic is roughly 95% mobile and mostly in-app, the highest mobile share of any major ad channel, so a landing page that loads slowly on a phone loses sales that a fast page would keep. This card joins your TikTok ad destinations to mobile Core Web Vitals (chiefly Largest Contentful Paint) and to the page’s conversion rate, then names each page that is both slow and underperforming, so the developer can fix the exact URL the same day. Caveat: a slow page is one cause of weak conversion among several (offer, audience, creative-to-page match), so use this card to shortlist pages for a fix rather than to assert that speed alone is the problem.

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Calculation

Calculated automatically from your TikTok Ads destinations joined to mobile web-vitals and conversion data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

A UK Gen-Z beauty brand running TikTok In-Feed and Video Shopping Ads to a mix of collection and product pages. Reading taken on 14 Mar 26 over the trailing 30 days. Account-average mobile conversion rate is about 2.6%. All figures are illustrative.
  1. Two pages fire. The new-in collection and the hero-serum product page are both slow on mobile (LCP above 4s) and converting at less than half the account average. The other two are either fast or converting normally, so they pass.
  2. The new-in collection is the priority. It is the slowest (5.8s) and the worst-converting, and it is receiving cold In-Feed traffic, the audience least forgiving of a slow first impression. On TikTok, where the user came from a fast-paced video and the page opens inside the in-app browser, a 5.8s load is brutal. Fix this URL first.
  3. Speed is a strong suspect, not a proven sole cause. The hero-serum page is slow and weak, but it may also have a creative-to-page mismatch (the video promised one thing, the page shows another, a common TikTok failure mode). The card shortlists it; the developer and the marketer confirm the cause together.
  4. The fix is a specific URL handed to engineering. Because the card names the exact page and its mobile LCP, the developer can profile that one template (often an oversized hero image or render-blocking script) rather than guessing across the whole site.
  5. The payoff is recovered conversion on existing spend. No extra budget is needed; bringing these two pages under the LCP threshold lifts the conversion rate on traffic you are already paying for, which is the cheapest revenue gain available, and on TikTok the upside is larger because the mobile share is near-total.
Quick reads:
  • Slow mobile LCP + low conversion + cold In-Feed audience = top priority. Cold TikTok traffic punishes slow pages hardest.
  • Slow LCP + normal conversion = monitor, not urgent. Speed is not yet costing conversions here.
  • Fast LCP + low conversion = the problem is not speed. Look at offer or creative-to-page match.

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Sibling cards merchants should reference together

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Reconciling against TikTok Ads Manager

Where to look in TikTok Ads Manager: TikTok Ads Manager does not measure Core Web Vitals, it has no native page-speed reporting. The in-platform proxies are partial:
  • TikTok Ads Manager > Ads > Destination / landing page shows which URL each ad points to, so you can see your destinations, but not their speed.
  • The landing-page view to conversion ratio hints at a drop-off after the click, which a slow page can cause, but it does not isolate speed from other causes.
The authoritative speed signal lives outside TikTok entirely, in the website-performance (Core Web Vitals) data this card joins in. TikTok tells you where the traffic goes; the web-vitals source tells you whether the page can hold it. Why our number may legitimately differ from TikTok: Cross-connector reconciliation:

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Known limitations / merchant FAQs

Why mobile only and not desktop? Because TikTok delivery is roughly 95% mobile and in-app. A desktop or blended web-vitals report can look healthy while the mobile experience that virtually all of your paid traffic sees is poor. Reading mobile vitals specifically matches the device your spend actually reaches, and on TikTok that is almost entirely mobile. Does a slow page definitely mean speed is hurting conversion? Not on its own. Speed is one cause of weak conversion among several, including offer, audience match, and creative-to-page consistency (a frequent TikTok issue where the video and the page do not line up). The card requires both a slow mobile LCP and a below-average conversion rate to fire, which strengthens the case, but the final diagnosis is a developer-and-marketer call. The page tests fine for me but is flagged. Why? Two common reasons. First, you may be testing on a fast device and connection, while the field data reflects a range of real mobile users. Second, almost all TikTok traffic opens inside the TikTok in-app browser, which can render slower than a standalone mobile browser. The card aims to reflect the paid-user experience, not a single test run. What usually makes an ad landing page slow on mobile? Frequently an oversized or unoptimised hero image, render-blocking scripts, heavy third-party tags, or a layout that shifts as content loads. Because the card names the exact URL, the developer can profile that one template rather than guessing across the site. How do I prioritise which flagged page to fix first? Sort by spend and audience temperature. A slow page receiving high cold-prospecting spend loses the most, because cold TikTok audiences are the least patient of any channel. Pair with Landing Page Performance to see which flagged URL carries the most budget. Can I tune the thresholds? Yes. Both the LCP slow threshold and the conversion-gap threshold are configurable per profile in the Alert Rules tab. Tighten them to surface more pages for a proactive speed programme, or loosen them to focus only on the worst offenders.

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Tracked live in Vortex IQ Nerve Centre

Mobile Landing Pages with Poor Web Vitals is one of hundreds of KPI pulses Vortex IQ tracks across TikTok Ads and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.