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https://ajuntament.barcelona.cat/mercats/es/los-mercados/mercats-un-clic

Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
7
PASS
16
INFO
4

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.31 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

6.50 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

93 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.135

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.56 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

6.68 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
28
16 PASS 7 REVIEW 1 FIX
D
Third-Party Impact
Action
67% third-party, 0 ms blocking
FIX
67% third-party, 0 ms blocking
Warning::
Third-party code accounts for 67% of page weight (503.3 KiB of 753.5 KiB)
Info::
Third-party blocking time is low (0 ms)
33%
67%
First-party Third-party
C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.barcelona.cat/assetsdi/img/2025/logo-n... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.lawwwing.com/media/widgets/brands/2ef9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ajuntament.barcelona.cat/mercats/modules/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.barcelona.cat/assets/images/brand/bann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 212 KB
0 oversized -0 KB
15 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1171ms total JS execution
REVIEW
1171ms total JS execution
Warning::
https://ajuntament.barcelona.cat/mercats/es/los-me...: 323ms CPU time
Warning::
Unattributable: 292ms CPU time
Info::
https://ajuntament.barcelona.cat/mercats/sites/def...: 203ms CPU time
Info::
https://plausible.io/js/pa-TRenRSJchypQBtDDwovxf.j...: 138ms CPU time
Info::
https://cdn.lawwwing.com/widgets/current/2ef97148-...: 125ms CPU time
Info::
Third-party scripts: 353ms (30% of total)

Main Thread Breakdown

Other 35% Style & Layout 27% Script Evaluation 23% Parse HTML & CSS 6% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://ajuntament.barcelona.cat/mercats/es/los-mercados/mercats-un-clic323ms6ms1ms1st
Unattributable292ms9ms0ms1st
https://ajuntament.barcelona.cat/mercats/sites/default/files/js/js_NihaZ83Q_yEbJnv9XKECI7AFEMJcXRH3DJ86_1xpkls.js?scope=footer&delta=1&language=es&theme=minerva_subtheme&include=eJx1jkEOAjEIRS80zdzCnWeYQCW1SQsNUKO3t446ixp38F4-fIy8IajCit9pwV-20d1JGcpSM5PeYKvEfU1FcGafJZzHchIZscNbR79SpTV2c6nB_FEyp8O_JY6QuUKb-IXMIYLbxBMU0gwh815xtnvFP6-aSpUQocXXjTk6OrBlz8L2BPlYdEk203ms91ms19ms1st
https://plausible.io/js/pa-TRenRSJchypQBtDDwovxf.js138ms19ms1ms3rd
https://cdn.lawwwing.com/widgets/current/2ef97148-3d5b-4609-a816-113e25c232d8/lawwwing-core.js125ms68ms11ms3rd
https://www.barcelona.cat/assets/core/javascripts/core.js90ms60ms17ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
9 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
754 KB transferred, 49 requests
PASS
754 KB transferred, 49 requests
Info::
Page weighs 2.1 MB (754 KB transferred)
Info::
Fonts are 225 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 225 KB
Info::
49 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
754 KB / 2.4 MB budget
754 KB transferred
49 requests
0.15 g CO2 per page load
Fonts 224.7 KiB 30%
Images 211.8 KiB 28%
JavaScript 190.0 KiB 25%
CSS 98.5 KiB 13%
HTML 14.4 KiB 2%
Other 12.4 KiB 2%
Other 1.2 KiB 0%
Other 574 B 0%
Other 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
6 fonts (225 KB)
PASS
6 fonts (225 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

225 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 6.5 shttps://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjkicoajuntament-v2.ttf https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk — 88.5 KiB — 20 ms — font-display: swaphttps://www.barcelona.cat/assets/fonts/SourceSansPro/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://www.barcelona.cat/assets/fonts/SourceSansPro/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2 — 13.2 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesans3/v20/nwpStKy2OAdR1K-IwhWudF-R3w8aZejf5Hc.woff2nwpStKy2OAdR1K-IwhWudF-... https://fonts.gstatic.com/s/sourcesans3/v20/nwpStKy2OAdR1K-IwhWudF-R3w8aZejf5Hc.woff2 — 28.2 KiB — 155 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesans3/v20/nwpMtKy2OAdR1K-IwhWudF-R3woqZ-LYxnV18A.woff2nwpMtKy2OAdR1K-IwhWudF-... https://fonts.gstatic.com/s/sourcesans3/v20/nwpMtKy2OAdR1K-IwhWudF-R3woqZ-LYxnV18A.woff2 — 27.8 KiB — 163 ms — font-display: swaphttps://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7icoajuntament.ttf https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7 — 53.7 KiB — 23 ms — font-display: swaphttps://www.barcelona.cat/assets/fonts/SourceSansPro/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff26xK3dSBYKcSV-LCoeQqfX1R... https://www.barcelona.cat/assets/fonts/SourceSansPro/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2 — 13.2 KiB — 21 ms — font-display: swap
icoajuntament-v2.ttf ttf swap
Size 89 KB
Load time 20 ms
Start 282 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 13 KB
Load time 16 ms
Start 283 ms
Risk FOUT — text flashes from fallback to web font
nwpStKy2OAdR1K-IwhWudF-... woff2 swap
Size 28 KB
Load time 155 ms
Start 283 ms
Risk FOUT — text flashes from fallback to web font
nwpMtKy2OAdR1K-IwhWudF-... woff2 swap
Size 28 KB
Load time 163 ms
Start 283 ms
Risk FOUT — text flashes from fallback to web font
icoajuntament.ttf ttf swap
Size 54 KB
Load time 23 ms
Start 283 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 13 KB
Load time 21 ms
Start 284 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~43 KB and ~86 ms

A+
JS Bundles
11 scripts, 43 KB unused
PASS
11 scripts, 43 KB unused
Warning::
https://ajuntament.barcelona.cat/mercats/sites/def...: 43 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 43 KB
43 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ajuntament.barcelona.cat/mercats/sites/default/files/js/js_NihaZ83Q_yEbJnv9XKECI7AFEMJcXRH3DJ86_1xpkls.js?scope=footer&delta=1&language=es&theme=minerva_subtheme&include=eJx1jkEOAjEIRS80zdzCnWeYQCW1SQsNUKO3t446ixp38F4-fIy8IajCit9pwV-20d1JGcpSM5PeYKvEfU1FcGafJZzHchIZscNbR79SpTV2c6nB_FEyp8O_JY6QuUKb-IXMIYLbxBMU0gwh815xtnvFP6-aSpUQocXXjTk6OrBlz8L2BPlYdEk59 KB43 KB (73%)✓1st
https://www.barcelona.cat/assets/core/javascripts/core.js20 KB—✓3rd
https://ajuntament.barcelona.cat/mercats/core/assets/vendor/jquery/jquery.min.js?v=4.0.027 KB—✓1st
https://www.youtube.com/iframe_api14 KB—✓3rd
https://player.vimeo.com/api/player.js9 KB—✓3rd
https://plausible.io/js/pa-TRenRSJchypQBtDDwovxf.js3 KB—✓3rd
https://cdn.lawwwing.com/widgets/current/2ef97148-3d5b-4609-a816-113e25c232d8/cookie-widget.min.js2 KB—✓3rd
https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/v1/bcn-avisos.js3 KB—✓1st
https://www.youtube.com/s/player/a5c2aafe/www-widgetapi.vflset/www-widgetapi.js9 KB—✓3rd
https://plausible.io/js/pa-AybVeV39LSZBn-hvFDH2R.js3 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Asset Compression
1 of 2 asset hosts still on gzip
PASS
1 of 2 asset hosts still on gzip
Info::
www.barcelona.cat serves assets with gzip; brotli would be ~20% smaller (assets: 24)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: www.barcelona.cat (text/css)
Info::
cdn.lawwwing.com serves assets with brotli (assets: 6)
Got: cdn.lawwwing.com (application/javascript)
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
PASS
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
Main HTML max-age=300 (≤ 5min) is appropriate
Got: max-age=300, public
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Cookie,Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A
Page Weight Inventory
49 resources · 754 KB · 43 KB savings available
PASS
49 resources · 754 KB · 43 KB savings available
Info::
Within 1MB page-weight target
Got: 754 KB
Warning::
38 third-party resources (67% of weight)
49 resources · 753.5 KiB · 38 third-party Within 1MB page-weight target
Font 30% · 224.7 KiB
Image 28% · 213.0 KiB
JavaScript 25% · 190.0 KiB
CSS 13% · 98.5 KiB
Document 2% · 14.4 KiB
Other 2% · 13.0 KiB

~42.7 KiB of savings available

Remove unused JavaScript: 42.7 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
10 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300, public
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=300, public

DirectiveValueMeaning
max-age300Cache for 5 minutes
public—Any cache may store this response
Effective TTL: 300 seconds
Network Waterfall
49 requests over 643ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 6.5 shttps://ajuntament.barcelona.cat/mercats/es/los-mercados/mercats-un-clic/mercats/es/los-mercados/mercats-un... https://ajuntament.barcelona.cat/mercats/es/los-mercados/mercats-un-clic — 200 — 14.4 KiB — 36 ms — h2https://www.barcelona.cat/assets/core/stylesheets/core.csswww.barcelona.cat/assets/core/style... https://www.barcelona.cat/assets/core/stylesheets/core.css — 200 — 14.3 KiB — 89 ms — h2https://ajuntament.barcelona.cat/mercats/sites/default/files/css/css_7d-HOhHe9R-LKSuPSYmZPaF8WejcLBQJ2Eb8OTAayqE.css?delta=1&language=es&theme=minerva_subtheme&include=eJx1jtEKwjAMRX-oWx_8oJJ0Yau2SWnS6f7eoahQ8OUSziGXi5EDQmvg8XMFehg1huxKYmo7BO1oGxXysatJmdSOnHj9-rdEEVNrUAcepfNZONA1C0L-U5WiTHA936AQ2yA1p3gbmfQWKSiwhsvg7nBUSWzqKjRYz4Gb-qX1Cnn-kblz7ZiTbrQ4PdSoeAQltye6q3_lXGTpmZ6zeXnU/mercats/sites/default/files/css/cs... https://ajuntament.barcelona.cat/mercats/sites/default/files/css/css_7d-HOhHe9R-LKSuPSYmZPaF8WejcLBQJ2Eb8OTAayqE.css?delta=1&language=es&theme=minerva_subtheme&include=eJx1jtEKwjAMRX-oWx_8oJJ0Yau2SWnS6f7eoahQ8OUSziGXi5EDQmvg8XMFehg1huxKYmo7BO1oGxXysatJmdSOnHj9-rdEEVNrUAcepfNZONA1C0L-U5WiTHA936AQ2yA1p3gbmfQWKSiwhsvg7nBUSWzqKjRYz4Gb-qX1Cnn-kblz7ZiTbrQ4PdSoeAQltye6q3_lXGTpmZ6zeXnU — 200 — 1008 B — 7 ms — h2https://ajuntament.barcelona.cat/mercats/sites/default/files/css/css_38p8keGe7zl6FVw261Q2YqJZBo4EnEsDuamA2B5Ebpw.css?delta=2&language=es&theme=minerva_subtheme&include=eJx1jtEKwjAMRX-oWx_8oJJ0Yau2SWnS6f7eoahQ8OUSziGXi5EDQmvg8XMFehg1huxKYmo7BO1oGxXysatJmdSOnHj9-rdEEVNrUAcepfNZONA1C0L-U5WiTHA936AQ2yA1p3gbmfQWKSiwhsvg7nBUSWzqKjRYz4Gb-qX1Cnn-kblz7ZiTbrQ4PdSoeAQltye6q3_lXGTpmZ6zeXnU/mercats/sites/default/files/css/cs... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
30% of JavaScript execution is third-party
First-party Third-party 353ms · 64KB · €4/mo
Plausible Analytics
Analytics
Optional
Execution 138ms
Transfer 3 KB
Monthly Cost €2/mo
cdn.lawwwing.com
Other
Optional
Execution 125ms
Transfer 40 KB
Monthly Cost €1/mo
www.barcelona.cat
Other
Optional
Execution 90ms
Transfer 20 KB
Monthly Cost €1/mo

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)

LCP (p75)

1903 ms

85% good

INP (p75)

106 ms

92% good

CLS (p75)

0.050

89% good

FCP (p75)

1469 ms

TTFB (p75)

848 ms

This origin passes Core Web Vitals assessment
Image Optimization
17 images, 47 KB total, 39 KB wasted
INFO

Image Optimization Audit

Total Images

17

Total Size

47 KB

Oversized

1

Wasted

39 KB

16 missing dimensions 11 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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