A visitor from an ad has no patience in reserve. They clicked out of curiosity, they are on a phone, and if the screen stays white, they go back to the search results. You paid for the click, but the person never saw the page.
Google measures how a page feels to a real person with three indicators called Core Web Vitals. They are worth understanding even if you never touch code: they show where exactly the page is slow.
Three indicators in plain words
| Indicator | What it measures | Good, according to Google |
|---|---|---|
| LCP — Largest Contentful Paint | How quickly the main thing on the first screen appears: the headline or the large image | 2.5 seconds or less |
| INP — Interaction to Next Paint | How quickly the page responds when you tap a button or a field | 200 milliseconds or less |
| CLS — Cumulative Layout Shift | Whether the content jumps while the page loads | 0.1 or less |
The thresholds are taken from Google's documentation. Google evaluates them on real visits: a page is considered good when at least 75% of visits fit within the threshold.
How to check your page
- Open PageSpeed Insights (pagespeed.web.dev) and paste the address of the landing page — not the homepage, but the page the ads lead to.
- Look at the mobile tab first. Most paid traffic comes from phones, and the mobile result is almost always worse.
- At the top are the data from real users, if the page has enough visits. Below is a laboratory test: it is useful for finding causes, but real-user data matters more.
- Scroll to the list of recommendations. It is sorted by how much time each fix can save.
Do not chase the score of 100. The goal is that all three indicators are in the green zone on mobile. After that, further optimization gives little.
What slows landing pages down most often
Slow first screen (LCP)
- A heavy image or video on the first screen. A multi-megabyte picture exported straight from the design tool. Fix: modern formats (WebP, AVIF), dimensions matching the screen, a poster image instead of an autoplaying video.
- The main image is loaded lazily. Lazy loading is good for pictures below; the first-screen image should load immediately.
- Many fonts. Each weight is a separate file. Two or three are usually enough.
- Scripts in the way. Chats, widgets and trackers loaded before the content. Fix: load them after the page is shown.
Slow response (INP)
- Too many third-party scripts. Several analytics systems, a heat map, a chat, a pop-up tool — each takes its share of the phone's processor. Keep the ones you actually look at.
- Heavy animations. Effects tied to scrolling that recalculate on every movement. Fix: simpler effects, and only while the block is on screen.
Jumping content (CLS)
- Images without specified dimensions. The browser does not know how much space to leave, and the text jumps when the picture arrives.
- Banners inserted on top. A cookie notice or a promo bar that pushes the whole page down — and the button moves out from under the finger.
- Late-loading fonts. The text is redrawn in a different width, and the lines shift.
Where to start
If time is short, go in this order — from the largest effect to the smallest:
- Compress and resize the first-screen image; remove lazy loading from it.
- Remove scripts and widgets you do not use, postpone the rest.
- Set dimensions for all images and reserve space for banners.
- Reduce the number of fonts and weights.
- Check again in PageSpeed Insights — on mobile.
Does the platform matter?
Less than people think. A fast page can be built on Framer, on Webflow and in plain code — and a slow one too. The speed is decided by what is put on the page: image weight, the number of scripts, the complexity of animations. The platform only sets how easy it is to keep this under control.
Speed is also not a goal in itself. A fast page with an unclear offer will not bring leads. But a slow page loses visitors before they read the offer — so speed is the first thing to rule out.
Speed is one of the six areas we check and fix in Audit & Fix ($990, 5 working days) — together with conversion, usability, design, search and analytics, with a before/after report. Or send the link for a free teardown: a written reply within 2–3 hours.
See Audit & Fix → 💬 Send Your Link on WhatsAppIn short
- Three indicators: LCP — how fast the main thing appears (up to 2.5 s), INP — how fast the page responds (up to 200 ms), CLS — whether the content jumps (up to 0.1).
- Check the ad landing page in PageSpeed Insights, on the mobile tab.
- The usual causes: a heavy first-screen image, extra scripts, images without dimensions.
- The goal is the green zone on mobile, not a score of 100.