Share
Embed
Slide 1
Slide 1 text
No content
Slide 2
Slide 2 text
Meet your Tour Manager
Estela Franco
Technical Architect,
Web Performance
guaca.bsky.social
toot.cafe/@guaca
Slide 3
Slide 3 text
No content
Slide 4
Slide 4 text
No content
Slide 5
Slide 5 text
No content
Slide 6
Slide 6 text
No content
Slide 7
Slide 7 text
No content
Slide 8
Slide 8 text
developer.chrome.com/docs/crux
Big Brother is Watching you!
Slide 9
Slide 9 text
httparchive.org
Slide 10
Slide 10 text
httparchive.org
Slide 11
Slide 11 text
No content
Slide 12
Slide 12 text
almanac.httparchive.org
Slide 13
Slide 13 text
almanac.httparchive.org
16.2M
websites
244TB
processed
Slide 14
Slide 14 text
No content
Slide 15
Slide 15 text
No content
Slide 16
Slide 16 text
No content
Slide 17
Slide 17 text
No content
Slide 18
Slide 18 text
uncompressed HTML
1.3M
mobile websites
Slide 19
Slide 19 text
uncompressed
JavaScript
29.5M
mobile resources
Slide 20
Slide 20 text
No content
Slide 21
Slide 21 text
Uncompressed
resources
Slide 22
Slide 22 text
No content
Slide 23
Slide 23 text
No content
Slide 24
Slide 24 text
Slide 25
Slide 25 text
Slide 26
Slide 26 text
✅ ✅ ✅ ✅
Slide 27
Slide 27 text
No content
Slide 28
Slide 28 text
Slide 29
Slide 29 text
Slide 30
Slide 30 text
No content
Slide 31
Slide 31 text
calendar.perfplanet.com/2022/lazy-loading-lcp-images-why-does-this-anti-pattern-happen/
Slide 32
Slide 32 text
2022
18%
almanac.httparchive.org/en/2022/performance
Slide 33
Slide 33 text
almanac.httparchive.org/en/2025/performance
2025
17%
Slide 34
Slide 34 text
No content
Slide 35
Slide 35 text
Lazy-loading the
LCP image
Slide 36
Slide 36 text
No content
Slide 37
Slide 37 text
No content
Slide 38
Slide 38 text
web.dev/articles/preload-scanner
Slide 39
Slide 39 text
Slide 40
Slide 40 text
Slide 41
Slide 41 text
No content
Slide 42
Slide 42 text
✅ ✅ ✅ ✅
Slide 43
Slide 43 text
Missing preloads for
critical resources
undiscoverable by the preload scanner
Slide 44
Slide 44 text
No content
Slide 45
Slide 45 text
everything everywhere all at
once
Slide 46
Slide 46 text
No content
Slide 47
Slide 47 text
No content
Slide 48
Slide 48 text
No content
Slide 49
Slide 49 text
Excessive or
unnecessary
preloading
Slide 50
Slide 50 text
No content
Slide 51
Slide 51 text
No content
Slide 52
Slide 52 text
No content
Slide 53
Slide 53 text
{
"prerender": [{
"where": { "selector_matches": ".prerender" }
}],
"prefetch": [{
"where": { "selector_matches": ".prefetch" }
}]
}
developer.chrome.com/docs/web-platform/implementing-speculation-rules
Slide 54
Slide 54 text
HTTP header:
Speculation-Rules: "/speculationrules.json"
developer.chrome.com/docs/web-platform/implementing-speculation-rulesa
Slide 55
Slide 55 text
✅ ✅ ❌ ❌
Slide 56
Slide 56 text
performance.shopify.com/blogs/blog/speculation-rules-at-shopify
Slide 57
Slide 57 text
performance.shopify.com/blogs/blog/speculation-rules-at-shopify
Slide 58
Slide 58 text
No content
Slide 59
Slide 59 text
Not leveraging
Speculation Rules
Slide 60
Slide 60 text
No content
Slide 61
Slide 61 text
No content
Slide 62
Slide 62 text
1. Uncompressed resources
2. Lazy-loading the LCP image
3. Missing preloads for critical resources
undiscoverable by the preload scanner
4. Excessive or unnecessary preloading
BONUS TRACK
5. Not leveraging Speculation Rules
Slide 63
Slide 63 text
planetaberilis.com
guaca.bsky.social
toot.cafe/@guaca
20% DTO
con código
“MUJERESENSEO”