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Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
3
PASS
15
INFO
5

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
92
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.

757 ms

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

1.25 s

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

10 ms

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

0.000

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

757 ms

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

1.90 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
24
15 PASS 3 REVIEW 1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 11 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
758ms total JS execution
REVIEW
758ms total JS execution
Warning::
https://costdown.org/_next/static/chunks/1255-fc6c...: 306ms CPU time
Warning::
https://costdown.org/: 257ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-184...: 120ms CPU time
Info::
Unattributable: 75ms CPU time
Info::
Third-party scripts: 120ms (16% of total)

Main Thread Breakdown

Script Evaluation 51% Style & Layout 20% Other 16% Script Parsing & Compilation 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js306ms229ms8ms1st
https://costdown.org/257ms19ms14ms1st
https://www.googletagmanager.com/gtag/js?id=AW-18482447436120ms100ms19ms3rd
Unattributable75ms9ms0ms1st
B
JS Bundles
12 scripts, 59 KB unused
REVIEW
12 scripts, 59 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-184...: 59 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 59 KB
59 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-18482447436167 KB59 KB (36%)✓3rd
https://costdown.org/_next/static/chunks/webpack-532f1d0ac5702c23.js3 KB—✓1st
https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js54 KB—✓1st
https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js46 KB—✓1st
https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js1 KB—✓1st
https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js4 KB—✓1st
https://costdown.org/_next/static/chunks/9785-759ffab57de737d5.js26 KB—✓1st
https://costdown.org/_next/static/chunks/2348-6835f5c6d92c6775.js4 KB—✓1st
https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-ed4983d33c269fbd.js7 KB—✓1st
https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-2b77dd9a726a6fec.js2 KB—✓1st

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+
Page Weight Budget
647 KB transferred, 38 requests
PASS
647 KB transferred, 38 requests
Info::
Page weighs 1.5 MB (647 KB transferred)
Info::
Fonts are 216 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 216 KB
Info::
38 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
647 KB / 2.4 MB budget
647 KB transferred
38 requests
0.13 g CO2 per page load
JavaScript 327.7 KiB 51%
Fonts 216.5 KiB 33%
HTML 59.5 KiB 9%
Other 13.2 KiB 2%
Images 11.0 KiB 2%
CSS 10.9 KiB 2%
Other 6.5 KiB 1%
Other 978 B 0%
Other 462 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
Third-Party Impact
28% third-party, 0 ms blocking
PASS
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (180.4 KiB of 646.7 KiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
First-party Third-party
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 (216 KB)
PASS
6 fonts (216 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

216 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 500 ms 1.0 s FCP 757 ms LCP 1.3 shttps://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff262c97acc3aa63787-s.p.woff2 https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2 — 12.8 KiB — 41 ms — font-display: swaphttps://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 48.4 KiB — 41 ms — font-display: swaphttps://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2bb3ef058b751a6ad-s.woff2 https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2 — 40.6 KiB — 814 ms — font-display: swaphttps://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2df0a9ae256c0569c-s.woff2 https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2 — 11.1 KiB — 835 ms — font-display: swaphttps://costdown.org/_next/static/media/21350d82a1f187e9-s.woff221350d82a1f187e9-s.woff2 https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2 — 19.4 KiB — 507 ms — font-display: swaphttps://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff28e9860b6e62d6359-s.woff2 https://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff2 — 84.3 KiB — 824 ms — font-display: swap
62c97acc3aa63787-s.p.woff2 woff2 swap
Size 13 KB
Load time 41 ms
Start 303 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 41 ms
Start 304 ms
Risk FOUT — text flashes from fallback to web font
bb3ef058b751a6ad-s.woff2 woff2 swap
Size 41 KB
Load time 814 ms
Start 467 ms
Risk FOUT — text flashes from fallback to web font
df0a9ae256c0569c-s.woff2 woff2 swap
Size 11 KB
Load time 835 ms
Start 469 ms
Risk FOUT — text flashes from fallback to web font
21350d82a1f187e9-s.woff2 woff2 swap
Size 19 KB
Load time 507 ms
Start 470 ms
Risk FOUT — text flashes from fallback to web font
8e9860b6e62d6359-s.woff2 woff2 swap
Size 84 KB
Load time 824 ms
Start 470 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)
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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
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 uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, max-age=0, must-revalidate
A+
Server-Timing Observability
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch,...
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::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+
Page Weight Inventory
38 resources · 647 KB · 59 KB savings available
PASS
38 resources · 647 KB · 59 KB savings available
Info::
Within 1MB page-weight target
Got: 647 KB
Info::
~59 KB of savings available
Info::
9 third-party resources (28% of weight)
38 resources · 646.7 KiB · 9 third-party Within 1MB page-weight target
JavaScript 51% · 327.7 KiB
Font 33% · 216.5 KiB
Document 9% · 59.5 KiB
Image 3% · 17.5 KiB
Other 2% · 14.6 KiB
CSS 2% · 10.9 KiB

~59.1 KiB of savings available

Remove unused JavaScript: 59.1 KiB
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
38 requests over 2005ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 757 ms LCP 1.3 shttps://costdown.org// https://costdown.org/ — 200 — 59.5 KiB — 836 ms — h3https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2/_next/static/media/62c97acc3aa6378... https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2 — 200 — 12.8 KiB — 41 ms — h3https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.4 KiB — 41 ms — h3https://costdown.org/_next/static/css/801436b9bcfe4d26.css/_next/static/css/801436b9bcfe4d26.... https://costdown.org/_next/static/css/801436b9bcfe4d26.css — 200 — 10.9 KiB — 23 ms — h3https://costdown.org/logo-128.png/logo-128.png https://costdown.org/logo-128.png — 200 — 10.4 KiB — 69 ms — h3https://costdown.org/_next/static/chunks/webpack-532f1d0ac5702c23.js/_next/static/chunks/webpack-532f1d... https://costdown.org/_next/static/chunks/webpack-532f1d0ac5702c23.js — 200 — 2.7 KiB — 71 ms — h3https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js/_next/static/chunks/4bd1b696-f7854... https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js — 200 — 54.2 KiB — 62 ms — h3https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js/_next/static/chunks/1255-fc6c00ab2... https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js — 200 — 46.5 KiB — 41 ms — h3https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js/_next/static/chunks/main-app-05a5f... https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js — 200 — 1.3 KiB — 29 ms — h3https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js/_next/static/chunks/2619-3c9e02e22... https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js — 200 — 4.4 KiB — 27 ms — h3https://costdown.org/_next/static/chunks/9785-759ffab57de737d5.js/_next/static/chunks/9785-759ffab57... https://costdown.org/_next/static/chunks/9785-759ffab57de737d5.js — 200 — 26.0 KiB — 47 ms — h3https://costdown.org/_next/static/chunks/2348-6835f5c6d92c6775.js/_next/static/chunks/2348-6835f5c6d... https://costdown.org/_next/static/chunks/2348-6835f5c6d92c6775.js — 200 — 4.3 KiB — 46 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-ed4983d33c269fbd.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-ed4983d33c269fbd.js — 200 — 7.0 KiB — 52 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-2b77dd9a726a6fec.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-2b77dd9a726a6fec.js — 200 — 1.6 KiB — 23 ms — h3https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2/_next/static/media/bb3ef058b751a6a... https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2 — 200 — 40.6 KiB — 814 ms — h3https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2/_next/static/media/df0a9ae256c0569... https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2 — 200 — 11.1 KiB — 835 ms — h3https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2/_next/static/media/21350d82a1f187e... https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2 — 200 — 19.4 KiB — 507 ms — h3https://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff2/_next/static/media/8e9860b6e62d635... https://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff2 — 200 — 84.3 KiB — 824 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v4bc70e2c01a94c73b74392e4234840661791215815920static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v4bc70e2c01a94c73b74392e4234840661791215815920 — 200 — 10.2 KiB — 28 ms — h2https://costdown.org/api/v?p=%2F&s=truc_tiep&l=1/api/v?p=%2F&s=truc_tiep&l=1 https://costdown.org/api/v?p=%2F&s=truc_tiep&l=1 — 204 — 978 B — 602 ms — h3https://costdown.org/calculator?_rsc=LgTZ6IbCAxa0MmDb/calculator?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/calculator?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 726 ms — h3https://costdown.org/help?_rsc=LgTZ6IbCAxa0MmDb/help?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/help?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 601 ms — h3https://costdown.org/my-projects?_rsc=LgTZ6IbCAxa0MmDb/my-projects?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/my-projects?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 588 ms — h3https://costdown.org/my-proposals?_rsc=LgTZ6IbCAxa0MmDb/my-proposals?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/my-proposals?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 754 ms — h3https://costdown.org/write?_rsc=LgTZ6IbCAxa0MmDb/write?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/write?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 608 ms — h3https://www.googletagmanager.com/gtag/js?id=AW-18482447436www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-18482447436 — 200 — 166.5 KiB — 282 ms — h2https://costdown.org/cdn-cgi/rum?/cdn-cgi/rum? https://costdown.org/cdn-cgi/rum? — 204 — 462 B — 31 ms — h3https://costdown.org/favicon.ico/favicon.ico https://costdown.org/favicon.ico — 200 — 6.5 KiB — 196 ms — h3https://costdown.org/login?_rsc=LgTZ6IbCAxa0MmDb/login?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/login?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 205 ms — h3https://costdown.org/register?_rsc=LgTZ6IbCAxa0MmDb/register?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/register?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 195 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 757 ms LCP 1.3 shttps://costdown.org// https://costdown.org/ — 200 — 59.5 KiB — 836 ms — h3https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2/_next/static/media/62c97acc3aa6378... https://costdown.org/_next/static/media/62c97acc3aa63787-s.p.woff2 — 200 — 12.8 KiB — 41 ms — h3https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://costdown.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.4 KiB — 41 ms — h3https://costdown.org/_next/static/css/801436b9bcfe4d26.css/_next/static/css/801436b9bcfe4d26.... https://costdown.org/_next/static/css/801436b9bcfe4d26.css — 200 — 10.9 KiB — 23 ms — h3https://costdown.org/logo-128.png/logo-128.png https://costdown.org/logo-128.png — 200 — 10.4 KiB — 69 ms — h3https://costdown.org/_next/static/chunks/webpack-532f1d0ac5702c23.js/_next/static/chunks/webpack-532f1d... https://costdown.org/_next/static/chunks/webpack-532f1d0ac5702c23.js — 200 — 2.7 KiB — 71 ms — h3https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js/_next/static/chunks/4bd1b696-f7854... https://costdown.org/_next/static/chunks/4bd1b696-f785427dddbba9fb.js — 200 — 54.2 KiB — 62 ms — h3https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js/_next/static/chunks/1255-fc6c00ab2... https://costdown.org/_next/static/chunks/1255-fc6c00ab2f765339.js — 200 — 46.5 KiB — 41 ms — h3https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js/_next/static/chunks/main-app-05a5f... https://costdown.org/_next/static/chunks/main-app-05a5fe279f4f6e20.js — 200 — 1.3 KiB — 29 ms — h3https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js/_next/static/chunks/2619-3c9e02e22... https://costdown.org/_next/static/chunks/2619-3c9e02e22d10480a.js — 200 — 4.4 KiB — 27 ms — h3https://costdown.org/_next/static/chunks/9785-759ffab57de737d5.js/_next/static/chunks/9785-759ffab57... https://costdown.org/_next/static/chunks/9785-759ffab57de737d5.js — 200 — 26.0 KiB — 47 ms — h3https://costdown.org/_next/static/chunks/2348-6835f5c6d92c6775.js/_next/static/chunks/2348-6835f5c6d... https://costdown.org/_next/static/chunks/2348-6835f5c6d92c6775.js — 200 — 4.3 KiB — 46 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-ed4983d33c269fbd.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/layout-ed4983d33c269fbd.js — 200 — 7.0 KiB — 52 ms — h3https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-2b77dd9a726a6fec.js/_next/static/chunks/app/%5Blang%5D... https://costdown.org/_next/static/chunks/app/%5Blang%5D/page-2b77dd9a726a6fec.js — 200 — 1.6 KiB — 23 ms — h3https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2/_next/static/media/bb3ef058b751a6a... https://costdown.org/_next/static/media/bb3ef058b751a6ad-s.woff2 — 200 — 40.6 KiB — 814 ms — h3https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2/_next/static/media/df0a9ae256c0569... https://costdown.org/_next/static/media/df0a9ae256c0569c-s.woff2 — 200 — 11.1 KiB — 835 ms — h3https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2/_next/static/media/21350d82a1f187e... https://costdown.org/_next/static/media/21350d82a1f187e9-s.woff2 — 200 — 19.4 KiB — 507 ms — h3https://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff2/_next/static/media/8e9860b6e62d635... https://costdown.org/_next/static/media/8e9860b6e62d6359-s.woff2 — 200 — 84.3 KiB — 824 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v4bc70e2c01a94c73b74392e4234840661791215815920static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v4bc70e2c01a94c73b74392e4234840661791215815920 — 200 — 10.2 KiB — 28 ms — h2https://costdown.org/api/v?p=%2F&s=truc_tiep&l=1/api/v?p=%2F&s=truc_tiep&l=1 https://costdown.org/api/v?p=%2F&s=truc_tiep&l=1 — 204 — 978 B — 602 ms — h3https://costdown.org/calculator?_rsc=LgTZ6IbCAxa0MmDb/calculator?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/calculator?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 726 ms — h3https://costdown.org/help?_rsc=LgTZ6IbCAxa0MmDb/help?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/help?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 601 ms — h3https://costdown.org/my-projects?_rsc=LgTZ6IbCAxa0MmDb/my-projects?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/my-projects?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 588 ms — h3https://costdown.org/my-proposals?_rsc=LgTZ6IbCAxa0MmDb/my-proposals?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/my-proposals?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 754 ms — h3https://costdown.org/write?_rsc=LgTZ6IbCAxa0MmDb/write?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/write?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 608 ms — h3https://www.googletagmanager.com/gtag/js?id=AW-18482447436www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-18482447436 — 200 — 166.5 KiB — 282 ms — h2https://costdown.org/cdn-cgi/rum?/cdn-cgi/rum? https://costdown.org/cdn-cgi/rum? — 204 — 462 B — 31 ms — h3https://costdown.org/favicon.ico/favicon.ico https://costdown.org/favicon.ico — 200 — 6.5 KiB — 196 ms — h3https://costdown.org/login?_rsc=LgTZ6IbCAxa0MmDb/login?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/login?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 205 ms — h3https://costdown.org/register?_rsc=LgTZ6IbCAxa0MmDb/register?_rsc=LgTZ6IbCAxa0MmDb https://costdown.org/register?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.6 KiB — 195 ms — h3https://costdown.org/help/using-ai-browser-extensions?_rsc=LgTZ6IbCAxa0MmDb/help/using-ai-browser-extensions?_... https://costdown.org/help/using-ai-browser-extensions?_rsc=LgTZ6IbCAxa0MmDb — 200 — 1.7 KiB — 312 ms — h3https://googleads.g.doubleclick.net/pagead/viewthroughconversion/18482447436/?random=1791644031813&cv=11&fst=1791644031813&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=4googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/viewthroughconversion/18482447436/?random=1791644031813&cv=11&fst=1791644031813&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=4 — 200 — 3.1 KiB — 130 ms — h3https://www.googletagmanager.com/td?id=AW-18482447436&v=3&t=t&pid=1843857728&gtm=45be6a72h1v9265555981za200zd9265555981xf1&seq=1&exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034&dl=costdown.org%2F&tdp=AW-18482447436;265555981;0;0;0&frm=0&rtg=265555981&slo=9&hlo=9&lst=3&bt=0&ct=3&jsp=17&z=0www.googletagmanager.com/td?id=AW-1... https://www.googletagmanager.com/td?id=AW-18482447436&v=3&t=t&pid=1843857728&gtm=45be6a72h1v9265555981za200zd9265555981xf1&seq=1&exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034&dl=costdown.org%2F&tdp=AW-18482447436;265555981;0;0;0&frm=0&rtg=265555981&slo=9&hlo=9&lst=3&bt=0&ct=3&jsp=17&z=0 — 204 — 430 B — 65 ms — h2https://www.google.com/rmkt/collect/18482447436/?random=1791644031813&cv=11&fst=1791644031813&fmt=8&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=68&gcp=5www.google.com/rmkt/collect/1848244... https://www.google.com/rmkt/collect/18482447436/?random=1791644031813&cv=11&fst=1791644031813&fmt=8&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=68&gcp=5 — 200 — 20 B — 127 ms — h3https://www.google.com/ccm/collect?rcb=13&frm=0&apvc=1&auid=297208671.1791644032&dt=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&tid=AW-18482447436&en=page_view&dl=https%3A%2F%2Fcostdown.org%2F&scrsrc=www.googletagmanager.com&rnd=1316904726.1791644032&navt=n&npa=0&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&tft=1791644031851&tfd=1755&tids=AW-18482447436&fmt=8www.google.com/ccm/collect?rcb=13&f... https://www.google.com/ccm/collect?rcb=13&frm=0&apvc=1&auid=297208671.1791644032&dt=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&tid=AW-18482447436&en=page_view&dl=https%3A%2F%2Fcostdown.org%2F&scrsrc=www.googletagmanager.com&rnd=1316904726.1791644032&navt=n&npa=0&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&tft=1791644031851&tfd=1755&tids=AW-18482447436&fmt=8 — 200 — 21 B — 128 ms — h3https://ad.doubleclick.net/ccm/s/collect?auid=297208671.1791644032&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&fmt=8ad.doubleclick.net/ccm/s/collect?au... https://ad.doubleclick.net/ccm/s/collect?auid=297208671.1791644032&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&fmt=8 — 204 — 22 B — 118 ms — h3https://www.google.com/pagead/1p-user-list/18482447436/?random=1791644031813&cv=11&fst=1791640800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=3&is_vtc=1&cid=CAQS6wEAQM4h3NWfCmmt9YfoGWUB3gq2fMdlITMgKvQQQM6Eg18nxTn7AutSmoKfkr_-i17HjXiychGim2nxJQW_yY0spHetqNUJ2kTgkLI9y73p9hJohwLugZusFLRjNu41apJadrQpZRVknCDJObxvFM1_pnzNLz3QW5Y-54kqAk8Q7fNVJotM_AhxJtv3hQSrAjfn1VfXK2gTh5K0tny0vmixQeBDOD0lrBG15Keq59Q7wRSA9g6zMnn4t2wXSMYjlw-WhuLdVt4X115gBonW4It9x7sPAqYsyATlfUy9gVFS4b4BowAqJ7EoyIOg&random=3015559576&rmt_tld=0&ipr=ywww.google.com/pagead/1p-user-list/... https://www.google.com/pagead/1p-user-list/18482447436/?random=1791644031813&cv=11&fst=1791640800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=3&is_vtc=1&cid=CAQS6wEAQM4h3NWfCmmt9YfoGWUB3gq2fMdlITMgKvQQQM6Eg18nxTn7AutSmoKfkr_-i17HjXiychGim2nxJQW_yY0spHetqNUJ2kTgkLI9y73p9hJohwLugZusFLRjNu41apJadrQpZRVknCDJObxvFM1_pnzNLz3QW5Y-54kqAk8Q7fNVJotM_AhxJtv3hQSrAjfn1VfXK2gTh5K0tny0vmixQeBDOD0lrBG15Keq59Q7wRSA9g6zMnn4t2wXSMYjlw-WhuLdVt4X115gBonW4It9x7sPAqYsyATlfUy9gVFS4b4BowAqJ7EoyIOg&random=3015559576&rmt_tld=0&ipr=y — 200 — 64 B — 64 ms — h3https://www.google.com.br/pagead/1p-user-list/18482447436/?random=1791644031813&cv=11&fst=1791640800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=3&is_vtc=1&cid=CAQS6wEAQM4h3NWfCmmt9YfoGWUB3gq2fMdlITMgKvQQQM6Eg18nxTn7AutSmoKfkr_-i17HjXiychGim2nxJQW_yY0spHetqNUJ2kTgkLI9y73p9hJohwLugZusFLRjNu41apJadrQpZRVknCDJObxvFM1_pnzNLz3QW5Y-54kqAk8Q7fNVJotM_AhxJtv3hQSrAjfn1VfXK2gTh5K0tny0vmixQeBDOD0lrBG15Keq59Q7wRSA9g6zMnn4t2wXSMYjlw-WhuLdVt4X115gBonW4It9x7sPAqYsyATlfUy9gVFS4b4BowAqJ7EoyIOg&random=3015559576&rmt_tld=1&ipr=ywww.google.com.br/pagead/1p-user-li... https://www.google.com.br/pagead/1p-user-list/18482447436/?random=1791644031813&cv=11&fst=1791640800000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6a72h1v9265555981za208zd9265555981xecxf1&gcd=13l3l3l3l1l1&dma=0&tag_exp=115616986~115938466~115938468~118897920~118897930~120213116~120385422~120469145~120469153~121046263~121046271~121246026~121246034~123227970~123322203&u_w=800&u_h=600&url=https%3A%2F%2Fcostdown.org%2F&rcb=13&frm=0&tiba=Costdown.org%20%7C%20Manufacturing%20Cost%20Reduction%20%26%20Kaizen&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=297208671.1791644032&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&ept=9&rfmt=3&fmt=3&is_vtc=1&cid=CAQS6wEAQM4h3NWfCmmt9YfoGWUB3gq2fMdlITMgKvQQQM6Eg18nxTn7AutSmoKfkr_-i17HjXiychGim2nxJQW_yY0spHetqNUJ2kTgkLI9y73p9hJohwLugZusFLRjNu41apJadrQpZRVknCDJObxvFM1_pnzNLz3QW5Y-54kqAk8Q7fNVJotM_AhxJtv3hQSrAjfn1VfXK2gTh5K0tny0vmixQeBDOD0lrBG15Keq59Q7wRSA9g6zMnn4t2wXSMYjlw-WhuLdVt4X115gBonW4It9x7sPAqYsyATlfUy9gVFS4b4BowAqJ7EoyIOg&random=3015559576&rmt_tld=1&ipr=y — 200 — 64 B — 119 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
16% of JavaScript execution is third-party
First-party Third-party 120ms · 167KB · €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 120ms
Transfer 167 KB
Unused 36%
Monthly Cost €2/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 (2026-09-11 — 2026-10-08)

LCP (p75)

2187 ms

86% good

INP (p75)

0 ms

0% good

CLS (p75)

0.000

95% good

FCP (p75)

2173 ms

TTFB (p75)

1202 ms

Image Optimization
1 images, 10 KB total, 9 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

10 KB

Oversized

1

Wasted

9 KB

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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