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https://ielts.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

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.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

499 ms

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

955 ms

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

44 ms

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

0.057

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

1.27 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.

3.00 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
15
7 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 54 requests
FIX
3.1 MB transferred, 54 requests
Warning::
Page weighs 8.2 MB (3.1 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 351 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 351 KB
Info::
54 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
54 requests
0.65 g CO2 per page load
JavaScript 2.1 MiB 69%
Images 460.0 KiB 14%
Fonts 351.0 KiB 11%
HTML 72.7 KiB 2%
CSS 67.0 KiB 2%
Other 38.5 KiB 1%
Other 2.9 KiB 0%
Other 2.5 KiB 0%
Other 854 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

D
Third-Party Impact
Action
73% third-party, 0 ms blocking
FIX
73% third-party, 0 ms blocking
Warning::
Third-party code accounts for 73% of page weight (2.3 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
27%
73%
First-party Third-party
F
JS Bundles
Action
20 scripts, 1.2 MB unused
FIX
20 scripts, 1.2 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ielts.org/dist/js/main.js?1773649603: 77 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 72 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1194 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://ielts.org/dist/js/main.js?177364960394 KB77 KB (82%)✓1st
https://www.googletagmanager.com/gtag/destination?id=DC-13517822&cx=c&gtm=4e64m0h2149 KB72 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1010674422&cx=c&gtm=4e64m0h2144 KB70 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1010263145&cx=c&gtm=4e64m0h2145 KB67 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NNLRXK180 KB65 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-10628837&cx=c&gtm=4e64m0h2129 KB65 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17612866914&cx=c&gtm=4e64m0h2143 KB64 KB (45%)✓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

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

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

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

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

F
Page Weight Inventory
Action
54 resources · 3.1 MB · 1.2 MB savings available
FIX
54 resources · 3.1 MB · 1.2 MB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
43 third-party resources (73% of weight)
Info::
3 resources over 200KB
54 resources · 3.1 MiB · 43 third-party 2.1 MiB over 1MB target
JavaScript 69% · 2.1 MiB
Image 15% · 462.3 KiB
Font 11% · 351.0 KiB
Document 2% · 73.8 KiB
CSS 2% · 70.8 KiB
Other 1% · 19.5 KiB

~1.2 MiB of savings available

Remove unused JavaScript: 1.2 MiB
B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 460 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
868ms total JS execution
REVIEW
868ms total JS execution
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 193ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NNL...: 142ms CPU time
Info::
https://ielts.org/: 129ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 116ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-X5M3...: 115ms CPU time
Warning::
Third-party scripts: 739ms (85% of total)

Main Thread Breakdown

Script Evaluation 63% Other 13% Script Parsing & Compilation 12% Style & Layout 6% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js193ms156ms27ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NNLRXK142ms123ms13ms3rd
https://ielts.org/129ms8ms1ms1st
https://cdn-ukwest.onetrust.com/scripttemplates/202401.2.0/otBannerSdk.js116ms74ms27ms3rd
https://www.googletagmanager.com/gtag/js?id=G-X5M3D7HLQQ&cx=c&gtm=4e64m0h2115ms84ms10ms3rd
Unattributable105ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-444SGTFNSL&cx=c&gtm=4e64m0h268ms57ms11ms3rd
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 (351 KB)
PASS
6 fonts (351 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

351 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 499 ms LCP 955 mshttps://ielts.org/dist/fonts/9d947cfaf8059753b85c.woff29d947cfaf8059753b85c.woff2 https://ielts.org/dist/fonts/9d947cfaf8059753b85c.woff2 — 68.9 KiB — 132 ms — font-display: swaphttps://ielts.org/dist/fonts/f3e79b3d83d8a599df08.woff2f3e79b3d83d8a599df08.woff2 https://ielts.org/dist/fonts/f3e79b3d83d8a599df08.woff2 — 57.3 KiB — 242 ms — font-display: swaphttps://ielts.org/dist/fonts/3ef06ba3c7099e63c9ce.woff23ef06ba3c7099e63c9ce.woff2 https://ielts.org/dist/fonts/3ef06ba3c7099e63c9ce.woff2 — 59.1 KiB — 134 ms — font-display: swaphttps://ielts.org/dist/fonts/e781c31572cc5a271d5b.woff2e781c31572cc5a271d5b.woff2 https://ielts.org/dist/fonts/e781c31572cc5a271d5b.woff2 — 67.9 KiB — 223 ms — font-display: swaphttps://ielts.org/dist/fonts/4a1a8ccb9c3b76efa174.woff24a1a8ccb9c3b76efa174.woff2 https://ielts.org/dist/fonts/4a1a8ccb9c3b76efa174.woff2 — 63.9 KiB — 147 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 82 ms — font-display: swap
9d947cfaf8059753b85c.woff2 woff2 swap
Size 69 KB
Load time 132 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
f3e79b3d83d8a599df08.woff2 woff2 swap
Size 57 KB
Load time 242 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
3ef06ba3c7099e63c9ce.woff2 woff2 swap
Size 59 KB
Load time 134 ms
Start 341 ms
Risk FOUT — text flashes from fallback to web font
e781c31572cc5a271d5b.woff2 woff2 swap
Size 68 KB
Load time 223 ms
Start 341 ms
Risk FOUT — text flashes from fallback to web font
4a1a8ccb9c3b76efa174.woff2 woff2 swap
Size 64 KB
Load time 147 ms
Start 341 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 82 ms
Start 1.1 s
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A+
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600, stale-while-revalidate=30, stale-if-error=86400
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
Last-Modified header present
Cache-Control

max-age=600, stale-while-revalidate=30, stale-if-error=86400

DirectiveValueMeaning
max-age600Cache for 10 minutes
stale-while-revalidate30Serve stale for 30 seconds while fetching fresh
stale-if-error86400
Effective TTL: 600 seconds
Network Waterfall
54 requests over 1577ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 499 ms LCP 955 mshttps://ielts.org// https://ielts.org/ — 200 — 45.0 KiB — 161 ms — h2https://ielts.org/dist/css/main.css?1773649603/dist/css/main.css?1773649603 https://ielts.org/dist/css/main.css?1773649603 — 200 — 24.8 KiB — 121 ms — h2https://ielts.org/dist/js/main.js?1773649603/dist/js/main.js?1773649603 https://ielts.org/dist/js/main.js?1773649603 — 200 — 94.3 KiB — 133 ms — h2https://ielts.org/cdn/ielts-ui-and-design/homepage/busy-new-york-street.webp?width=1400&fit=cover&s=BZgoX0ZIrje04KVH4ZPYITKG2iFWNPtHpONSKRX1DRs/cdn/ielts-ui-and-design/homepage/b... https://ielts.org/cdn/ielts-ui-and-design/homepage/busy-new-york-street.webp?width=1400&fit=cover&s=BZgoX0ZIrje04KVH4ZPYITKG2iFWNPtHpONSKRX1DRs — 200 — 374.9 KiB — 148 ms — h2https://ielts.org/dist/images/favicon/site.webmanifest?1773649603/dist/images/favicon/site.webmanife... https://ielts.org/dist/images/favicon/site.webmanifest?1773649603 — 200 — 854 B — 122 ms — h3https://www.google.com/recaptcha/api.js?render=6LcI3iAlAAAAAA4do03y5qAzSgwzphsPdztu6mLfwww.google.com/recaptcha/api.js?ren... https://www.google.com/recaptcha/api.js?render=6LcI3iAlAAAAAA4do03y5qAzSgwzphsPdztu6mLf — 200 — 1.0 KiB — 72 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-NNLRXKwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NNLRXK — 200 — 180.2 KiB — 174 ms — h2https://ielts.org/dist/fonts/9d947cfaf8059753b85c.woff2/dist/fonts/9d947cfaf8059753b85c.wo... https://ielts.org/dist/fonts/9d947cfaf8059753b85c.woff2 — 200 — 68.9 KiB — 132 ms — h3https://ielts.org/dist/fonts/f3e79b3d83d8a599df08.woff2/dist/fonts/f3e79b3d83d8a599df08.wo... https://ielts.org/dist/fonts/f3e79b3d83d8a599df08.woff2 — 200 — 57.3 KiB — 242 ms — h3https://ielts.org/dist/fonts/3ef06ba3c7099e63c9ce.woff2/dist/fonts/3ef06ba3c7099e63c9ce.wo... https://ielts.org/dist/fonts/3ef06ba3c7099e63c9ce.woff2 — 200 — 59.1 KiB — 134 ms — h3https://ielts.org/dist/fonts/e781c31572cc5a271d5b.woff2/dist/fonts/e781c31572cc5a271d5b.wo... https://ielts.org/dist/fonts/e781c31572cc5a271d5b.woff2 — 200 — 67.9 KiB — 223 ms — h3https://ielts.org/dist/fonts/4a1a8ccb9c3b76efa174.woff2/dist/fonts/4a1a8ccb9c3b76efa174.wo... https://ielts.org/dist/fonts/4a1a8ccb9c3b76efa174.woff2 — 200 — 63.9 KiB — 147 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.4 KiB — 195 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js?did=bd822df2-758c-4472-96b8-e1cce9862b4ecdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js?did=bd822df2-758c-4472-96b8-e1cce9862b4e — 200 — 9.0 KiB — 68 ms — h2https://www.googletagmanager.com/gtag/js?id=G-444SGTFNSL&cx=c&gtm=4e64m0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-444SGTFNSL&cx=c&gtm=4e64m0h2 — 200 — 172.4 KiB — 61 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-17612866914&cx=c&gtm=4e64m0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-17612866914&cx=c&gtm=4e64m0h2 — 200 — 142.7 KiB — 80 ms — h2https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LcI3iAlAAAAAA4do03y5qAzSgwzphsPdztu6mLf&co=aHR0cHM6Ly9pZWx0cy5vcmc6NDQz&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=3o5anr5n3019www.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LcI3iAlAAAAAA4do03y5qAzSgwzphsPdztu6mLf&co=aHR0cHM6Ly9pZWx0cy5vcmc6NDQz&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=3o5anr5n3019 — 200 — 27.7 KiB — 97 ms — h3https://cdn-ukwest.onetrust.com/consent/bd822df2-758c-4472-96b8-e1cce9862b4e/bd822df2-758c-4472-96b8-e1cce9862b4e.jsoncdn-ukwest.onetrust.com/consent/bd8... https://cdn-ukwest.onetrust.com/consent/bd822df2-758c-4472-96b8-e1cce9862b4e/bd822df2-758c-4472-96b8-e1cce9862b4e.json — 200 — 2.2 KiB — 42 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js — 200 — 8.6 KiB — 30 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-444SGTFNSL&gtm=45je64m0h2v883815333z872020908za20gzb72020908zd72020908&_p=1776898811967&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&ecid=25318241&_eu=EAAAAGA&are=1&cid=922737943.1776898812&ec_mode=a&frm=0&ir=1&pscdl=denied&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117384405~117512543~118463261&sid=1776898812&sct=1&seg=0&dl=https%3A%2F%2Fielts.org%2F&dt=IELTS%20%7C%20Welcome%20to%20IELTS&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=737region1.google-analytics.com/g/coll... 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https://ade.googlesyndication.com/ddm/activity/src=13517822;dc_pre=CNTltfTHgpQDFelQHQkdKqoPRQ;type=rmkt-0;cat=rmkt-3;rcb=18;ord=1;num=6747940776820;npa=1;u7=%2F;gdid=dYWJhMj;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;user_data_mode=a;_tu=KJA;gtm=45fe64m0h2v9168138080z872020908za20gzb72020908zd72020908xea;gcs=G100;gcd=13p3p3V2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938466~115938468~117266400;epver=2;~oref=https%3A%2F%2Fielts.org%2F? — 200 — 107 B — 38 ms — h2https://ielts.org/dist/images/favicon/favicon-32x32.png?1773649603/dist/images/favicon/favicon-32x32.... https://ielts.org/dist/images/favicon/favicon-32x32.png?1773649603 — 200 — 1.7 KiB — 69 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
85% of JavaScript execution is third-party
First-party Third-party 739ms · 630KB · €8/mo
www.gstatic.com
Other
Optional
Execution 193ms
Transfer 0 KB
Unused 49%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 180 KB
Unused 36%
Monthly Cost €2/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 116ms
Transfer 104 KB
Unused 52%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 173 KB
Unused 37%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 105ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 172 KB
Unused 37%
Monthly Cost €1/mo

85% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

52% of cdn-ukwest.onetrust.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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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