27 October 2026
Myth: layout shift only happens while loading CLS — Cumulative Layout Shift — measures content jumping around (that annoying moment a button hops just as you tap). Many people assume it's purely a page-load problem you c…
@CoreVitals101
21 October 2026
Myth: lazy-load every image to go faster Lazy loading means an image only downloads when you scroll near it — smart for photos far down the page. The advice "add it everywhere" sounds tidy, but it backfires. The correcti…
@CoreVitals101
17 October 2026
Myth: you need a PageSpeed score of 100 Good news first — this one's easier than it sounds. PageSpeed Insights (Google's free speed checker) shows a 0-100 score in a colored circle, and folks chase that 100 like a prize.…
@CoreVitals101
10 October 2026
A Pre-Launch Core Web Vitals Checklist Before you publish a new page, a quick run-through catches the common speed mistakes while they're still cheap to fix. Think of it like a pilot's pre-flight checklist — boring, but …
@CoreVitals101
07 October 2026
Inline Critical CSS to Paint Faster Your CSS file is render-blocking — the browser won't show anything until it loads. But you only need a small slice of CSS to draw the top of the page. Inlining that slice lets the page…
@CoreVitals101
03 October 2026
Verify a Fix Actually Worked The most-skipped step is confirming your change helped. Field data updates slowly, so a quick lab re-test plus patience is the right combo. Think of it like watering a plant — you check both …
@CoreVitals101
30 September 2026
Break Up Long Tasks to Improve INP INP — Interaction to Next Paint — suffers when JavaScript runs one giant task that locks the browser, so taps feel frozen. Breaking that task into smaller pieces lets the browser respon…
@CoreVitals101
29 September 2026
Serve Right-Sized Images With srcset Sending a 2000-pixel-wide image to a phone that only shows 400 pixels wastes load time and hurts LCP — Largest Contentful Paint. The srcset attribute lets the browser pick the best-fi…
@CoreVitals101
28 September 2026
Set Up Core Web Vitals Monitoring in Search Console Google Search Console has a free Core Web Vitals report that watches your whole site using real visitor data, grouping pages by problem. It's like a smoke detector for …
@CoreVitals101
27 September 2026
📎 Кстати, @push101_guide регулярно публикует what is push traffic.…
@CoreVitals101
26 September 2026
Test on Mobile, Not Just Desktop Most reports and tools default to one device, but Google ranks using mobile data, and phones are slower with weaker connections. A page that's green on desktop can be red on mobile. Think…
@CoreVitals101
25 September 2026
Stop Web Fonts From Shifting Your Text When a custom font loads, text can suddenly swap from a backup font to the real one, nudging everything around — a flash of restyled text. That movement feeds CLS — Cumulative Layou…
@CoreVitals101
24 September 2026
Reserve Space With aspect-ratio to Kill CLS Sometimes you can't know an image's exact pixel size, especially with responsive layouts. The CSS aspect-ratio property still reserves the right shape so nothing jumps. CLS — C…
@CoreVitals101
23 September 2026
Lazy-Load Images Below the Fold Below the fold means everything a visitor has to scroll to see. Loading those images immediately wastes bandwidth and slows your LCP. Lazy-loading delays them until the visitor scrolls nea…
@CoreVitals101
22 September 2026
Diagnose Why Your INP Is High INP — Interaction to Next Paint — measures how quickly your page responds when someone taps or clicks. A high INP means visitors tap and wait, which feels broken. Think of it like a light sw…
@CoreVitals101
21 September 2026
Defer JavaScript That Isn't Needed Right Away Many scripts load at the top of a page and freeze rendering, even though they aren't needed until later — chat widgets, analytics, sliders. Deferring tells the browser 'load …
@CoreVitals101
20 September 2026
Find What's Blocking Your Page From Rendering Render-blocking resources are files — usually CSS or JavaScript — that the browser must finish before it can show anything. Until they load, your visitor stares at a blank sc…
@CoreVitals101
19 September 2026
Convert Images to WebP the Safe Way WebP is a modern image format that's often 25 to 35 percent smaller than JPEG at the same quality. Smaller images load faster, which directly helps LCP — Largest Contentful Paint. Thin…
@CoreVitals101
18 September 2026
Field Data vs Lab Data: Which to Trust These two sit side by side in every report and confuse almost everyone. Field data is what real visitors actually experienced over the last 28 days. Lab data is one test from a cont…
@CoreVitals101
17 September 2026
How to Actually Read a PageSpeed Insights Report PageSpeed Insights is Google's free speed-checker, but the report can feel like a wall of numbers. Let's read it like a map, not a maze. Go to pagespeed.web.dev, paste you…
@CoreVitals101
15 September 2026
Find Which Element Is Your LCP LCP — Largest Contentful Paint — is the moment your biggest visible thing (usually a banner image or headline) finishes loading. Before you can speed it up, you need to know exactly which e…
@CoreVitals101
14 September 2026
The filmstrip vs the LCP number The LCP number tells you 'biggest element loaded at 3.2 seconds'. The filmstrip (a row of screenshots over time, in WebPageTest or DevTools) shows you what the visitor actually saw at each…
@CoreVitals101
13 September 2026
Inlining critical CSS vs deferring the rest CSS in your page head is render-blocking: the browser won't paint until it loads, which delays FCP and LCP. Two tactics tame this. Inlining critical CSS puts the few styles for…
@CoreVitals101
12 September 2026
Image CDN vs resizing images by hand Both shrink oversized images that bloat LCP (Largest Contentful Paint). Resizing by hand means you export each image at the right size yourself. An image CDN (a service that resizes o…
@CoreVitals101
11 September 2026
A CDN vs caching: which fixes slow TTFB? When your server is slow to answer, TTFB (Time To First Byte — the wait before anything arrives) climbs, and that drags LCP with it. Two tools help, differently. A CDN (Content De…
@CoreVitals101
10 September 2026
PageSpeed Insights vs Search Console for vitals Both pull from the same real-visitor data (CrUX), but serve different purposes. PageSpeed Insights checks one URL deeply. The Core Web Vitals report in Search Console group…
@CoreVitals101
09 September 2026
TBT in the lab vs INP in the field These two measure the same kind of problem, your page being busy and unresponsive, but from different seats. TBT (Total Blocking Time) is a lab number from one test run. INP (Interactio…
@CoreVitals101
08 September 2026
Why tools show the 75th percentile, not the average When you read a Core Web Vitals score, it's the 75th percentile (the value 75% of visits stay under), not the average. Averages hide pain: a few super-fast loads can ma…
@CoreVitals101
07 September 2026
Which network throttle should you test on? Throttling fakes a slower connection so you see what real visitors feel. DevTools offers 'Fast 4G', 'Slow 4G', and custom. Picking too fast hides problems; too slow scares you f…
@CoreVitals101
05 September 2026
Debugging INP: which tool catches the lag? INP (Interaction to Next Paint) measures the delay between a tap and the screen responding. Two tools help, but at different moments. The web-vitals JavaScript library logs the …
@CoreVitals101