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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
6
INFO
2

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.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.33 s

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

2.03 s

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

205 ms

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

0.117

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

3.34 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.

4.45 s

Page Load Progression

875 ms
1.8 s
2.6 s
3.5 s
4.4 s
5.3 s
6.1 s
7.0 s
Checks
15
6 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.6 MB transferred, 114 requests
FIX
2.6 MB transferred, 114 requests
Warning::
Page weighs 7.1 MB (2.6 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 501 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 501 KB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
114 requests
0.54 g CO2 per page load
JavaScript 1.1 MiB 43%
Images 625.0 KiB 24%
Fonts 501.4 KiB 19%
CSS 189.8 KiB 7%
HTML 68.1 KiB 3%
Other 66.0 KiB 3%
Other 27.7 KiB 1%
Other 25.4 KiB 1%
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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2443ms total JS execution
FIX
2443ms total JS execution
Warning::
https://www.thelancet.com/: 1124ms CPU time
Warning::
Unattributable: 312ms CPU time
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 307ms CPU time
Info::
https://www.thelancet.com/products/marlin/lancet/r...: 233ms CPU time
Info::
https://pagead2.googlesyndication.com/pagead/manag...: 132ms CPU time
Warning::
Third-party scripts: 2443ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Style & Layout 21% Other 13% Script Parsing & Compilation 7% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.thelancet.com/1124ms390ms12ms3rd
Unattributable312ms54ms0ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js307ms238ms33ms3rd
https://www.thelancet.com/products/marlin/lancet/releasedAssets/js/main.bundle-5827ee502c157697de27.js233ms143ms37ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js132ms105ms12ms3rd
https://www.thelancet.com/cdn-cgi/challenge-platform/scripts/jsd/main.js117ms112ms1ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js110ms70ms22ms3rd
https://www.thelancet.com/products/marlin/lancet/releasedAssets/js/lazy-imports-35d9c5d5f3cc57aa6549.js58ms38ms2ms3rd
https://www.thelancet.com/wro/f03726d8be65c99af4dc13935c7996e819a5ff0d~selected-legacy.js50ms30ms14ms3rd
D
JS Bundles
Action
34 scripts, 451 KB unused
FIX
34 scripts, 451 KB unused
Warning::
https://www.thelancet.com/products/marlin/lancet/r...: 148 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 100 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 62 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-800...: 57 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.thelancet.com/wro/f03726d8be65c99af4dc...: 51 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 451 KB
451 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.thelancet.com/products/marlin/lancet/releasedAssets/js/main.bundle-5827ee502c157697de27.js217 KB148 KB (69%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB100 KB (53%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119 KB62 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-800477382141 KB57 KB (41%)✓3rd
https://www.thelancet.com/wro/f03726d8be65c99af4dc13935c7996e819a5ff0d~selected-legacy.js68 KB51 KB (76%)✓3rd
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js73 KB31 KB (42%)✓3rd
https://rum-static.pingdom.net/prum.min.js3 KB—✓3rd
https://cdn.pbgrd.com/core-thelancet.js2 KB—✓3rd
https://www.thelancet.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://www.thelancet.com/products/marlin/lancet/releasedAssets/js/dynamic-imports-24631e94017e435c36b9.js4 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

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
114 resources · 2.6 MB · 451 KB savings available
FIX
114 resources · 2.6 MB · 451 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~451 KB of savings available
Warning::
113 third-party resources (100% of weight)
Info::
1 resources over 200KB
114 resources · 2.6 MiB · 113 third-party 1.6 MiB over 1MB target
JavaScript 43% · 1.1 MiB
Image 24% · 627.3 KiB
Font 19% · 501.4 KiB
CSS 7% · 194.3 KiB
Other 4% · 111.6 KiB
Document 3% · 68.8 KiB

~450.9 KiB of savings available

Remove unused JavaScript: 450.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.thelancet.com/do/10.1016/4f9d9162-93c9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/templates/jsp/_style2/_m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/pb-assets/Lancet/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/do/10.1016/04f8c4ae-ce4a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/do/10.1016/2e3f8d55-c132... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/pb-assets/Lancet/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/pb-assets/Lancet/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/pb-assets/ux3/logos/lanc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/pb-assets/Lancet/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thelancet.com/do/10.1016/a7d423f9-578d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 625 KB
0 oversized -0 KB
13 legacy format
10 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

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

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

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
16 fonts (501 KB)
PASS
16 fonts (501 KB)
Info::
16 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

16

501 KB total

Render-blocking

0

of 16

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 FCP 1.3 s LCP 2.0 shttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/icomoon/fonts/icomoon-c58c472f6dbb45c5ac335f7082fa4413.wofficomoon-c58c472f6dbb45c... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/icomoon/fonts/icomoon-c58c472f6dbb45c5ac335f7082fa4413.woff — 41.9 KiB — 48 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/source-sans-pro-latin-9ec6deaf6bada919e20b98f9f7b718b1.woff2source-sans-pro-latin-9... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/source-sans-pro-latin-9ec6deaf6bada919e20b98f9f7b718b1.woff2 — 1.4 KiB — 21 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/icomoon-d4d19ebe45b4314fc5be87fcc256cbf5.ttficomoon-d4d19ebe45b4314... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/icomoon-d4d19ebe45b4314fc5be87fcc256cbf5.ttf — 31.9 KiB — 41 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-Italic-e8e9d2be932753634d684acf98ae00d1.woff2NexusSansWebPro-Italic-... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-Italic-e8e9d2be932753634d684acf98ae00d1.woff2 — 79.4 KiB — 26 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-Italic-a5f7d7102fc13f8c4e2936bcb3db1b15.ttfNexusSansOffcPro-Italic... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-Italic-a5f7d7102fc13f8c4e2936bcb3db1b15.ttf — 60.8 KiB — 32 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 18 ms — font-display: swaphttps://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_2_0.woff22D333F_2_0.woff2 https://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_2_0.woff2 — 601 B — 214 ms — font-display: swaphttps://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_1_0.woff22D333F_1_0.woff2 https://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_1_0.woff2 — 601 B — 719 ms — font-display: swaphttps://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_2_0.woff2D333F_2_0.woff https://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_2_0.woff — 601 B — 291 ms — font-display: swaphttps://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_1_0.woff2D333F_1_0.woff https://www.thelancet.com/pb-assets/Lancet/homepage/carousel/fonts/2D333F_1_0.woff — 601 B — 206 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-d1d294e8281aca867fcd5828107e5c75.woff2NexusSansWebPro-d1d294e... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-d1d294e8281aca867fcd5828107e5c75.woff2 — 71.0 KiB — 40 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/elsevierwordmark-regular-OA-abed222f9c69c4a4e2e7f8c991402c04.woff2elsevierwordmark-regula... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/elsevierwordmark-regular-OA-abed222f9c69c4a4e2e7f8c991402c04.woff2 — 5.5 KiB — 31 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/elsevierwordmark-regular-OA-429993f3c95c7233c4162287acb8d36a.ttfelsevierwordmark-regula... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/elsevierwordmark-regular-OA-429993f3c95c7233c4162287acb8d36a.ttf — 4.6 KiB — 22 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-35ae3983ec06c363da48670566c43eed.ttfNexusSansOffcPro-35ae39... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-35ae3983ec06c363da48670566c43eed.ttf — 56.2 KiB — 35 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-Bold-dfad421c3860b40a209dabe6b543d2ce.woff2NexusSansWebPro-Bold-df... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansWebPro-Bold-dfad421c3860b40a209dabe6b543d2ce.woff2 — 74.3 KiB — 27 ms — font-display: swaphttps://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-Bold-36eb261c0f060d3fe3fa1cb0e54673e7.ttfNexusSansOffcPro-Bold-3... https://www.thelancet.com/products/marlin/lancet/releasedAssets/fonts/NexusSansOffcPro-Bold-36eb261c0f060d3fe3fa1cb0e54673e7.ttf — 57.6 KiB — 35 ms — font-display: swap
icomoon-c58c472f6dbb45c... woff swap
Size 42 KB
Load time 48 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
source-sans-pro-latin-9... woff2 swap
Size 1 KB
Load time 21 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
icomoon-d4d19ebe45b4314... ttf swap
Size 32 KB
Load time 41 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NexusSansWebPro-Italic-... woff2 swap
Size 79 KB
Load time 26 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
NexusSansOffcPro-Italic... ttf swap
Size 61 KB
Load time 32 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 18 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
2D333F_2_0.woff2 woff2 swap
Size 1 KB
Load time 214 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
2D333F_1_0.woff2 woff2 swap
Size 1 KB
Load time 719 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
2D333F_2_0.woff woff swap
Size 1 KB
Load time 291 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
2D333F_1_0.woff woff swap
Size 1 KB
Load time 206 ms
Start 3.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NexusSansWebPro-d1d294e... woff2 swap
Size 71 KB
Load time 40 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... woff2 swap
Size 6 KB
Load time 31 ms
Start 3.8 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... ttf swap
Size 5 KB
Load time 22 ms
Start 3.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NexusSansOffcPro-35ae39... ttf swap
Size 56 KB
Load time 35 ms
Start 3.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NexusSansWebPro-Bold-df... woff2 swap
Size 74 KB
Load time 27 ms
Start 4.0 s
Risk FOUT — text flashes from fallback to web font
NexusSansOffcPro-Bold-3... ttf swap
Size 58 KB
Load time 35 ms
Start 4.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~76 KB and ~152 ms

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

Network Waterfall
114 requests over 7873ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 1.3 s LCP 2.0 shttps://thelancet.com// https://thelancet.com/ — 302 — 1.2 KiB — 209 ms — h2https://id.elsevier.com/as/authorization.oauth2?platSite=LT%2Fthelancet&response_type=code&client_id=JBS&additionalPlatSites=LT%2Fjbs%2CSD%2Fscience%2CLT%2Fcell%2CLT%2Fgeneric&site=lancet-site&scope=openid+profile+address+email+els_auth_info+els_analytics_info+urn%3Acom%3Aelsevier%3Aidp%3Apolicy%3Aproduct%3Aindv_identity&claims=%7B%7D&redirect_uri=https%3A%2F%2Fwww.thelancet.com%2Fcallback%3Fred_uri%3D%252F&state=17311815710&authType=SINGLE_SIGN_IN&client_name=TheLancet.com&prompt=noneid.elsevier.com/as/authorization.oa... 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h3https://ep2.adtrafficquality.google/generate_204?hY-SQQep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?hY-SQQ — 204 — 40 B — 9 ms — 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https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604160201&jk=3460478260319307&bg=!gIOlg-HNAAY2C5OeFgs7AEcBe5WfOLpYeQlil5p3NepCLVHQ2pdv_xn3qxdN1CfIRAHvc7wDtntl2F8MDyvGaelC9ibF-eyBDAtURHZ-Xk13t6qBFBITCwIAAACbUgAAABBoAQd-ADeHclBZbHpddIiFDUds9TPJV7Ti5NxS6E_Wd0PTZzQ6vbAEcHJm90lGIl_UaFqkOFMGeU5g1nSaCgCSy-_lQM3ix3X5d_ZTlr9BtauQl9UhV4OfHZPsAIHp0o1512d26b5qXJcSSiogkIPpggdHxNJ2dtCuR8Bsm9OxF6y6ldAjs_bO_Dzg2bcR-_pFol3ee5KR9npcYNSUVjStREAvpXjhOmvAxyqxMCQ_zmasPHm5FUVODBVO7p7uhjTBTSulsm0dwBCMk0tmb2xUemCZAqqJqE9zTe5by_HCviUtDtvOGBlicQYa0FM5ODQH_-8MTUnajNhcCZV_2wI48H1GScCGpq8ddAGK3nFviiTUhyCN_u3VunwenRzXBIF1NzVFhkA2JRig7KP_2GTrSYfpLpRWZD64AvJ0-0ZZDsFua30-p88OUhNo2NtLYMDu3nPVK0k6Tw8lD_HE78jgApLfrs6CWx_FCeIB_Oiz_-CT__LV3J46oVEfTJ9g0OqouJ27kfB0EU5lfymVTCsLiiJd5nF21QfWSyw30BBBCRM0biW443SB3SX1o0Iqza3jo02jcznLvVP7511S-iFKYgYIYraJkZ7FMyB91KXfyIaCa-k2-C0Ni9_sAjWkUtnAaewX04SkubIP8QXBJAdKMnagPmRACJmBIsWe2pqTgd4_0EfOB7uHqdH0DLbYy5doRE_yxISVB5szJVL6By2jONo5BLkUffxxqi38G2WhCU9fnHeN6O2qJ3FUs8HySVbRjOlnrJ9waNEZlSV1aKMj_RF7SUgogi52N_gLfX2DoUOKW1JzZjsOkQOVkw_H86ryXQgj2T5rqnFXC5HQtOGDKJKzEzobGu0LpVBT4dgdSAYiHYkymR7Oz-zIqVLEqvJeY9HEq3yA9fMRkSk-1mKGNZOx6NXtWdIsMPesFrGzTju0Khdod9hVwnG8kF-SLALrzFYjLncPP7lllDyK78pw1Bghbsi3EaPNdNwqDn_99lNsnvRpvoiCt3uS13m7GSxUijea8a-K6QqlXoonwlvpUElhCu9edZXREGuM-QrbZmgvEehOkT3GMIEArIesaiKItJNURbFT8RHWB_k-C3wcUC2edEmzw3dPzUMlRUzbOfxpWwGM2w7Dn8l5jbrTtyodn9XfHoDT9ZwPcusYx1_UktP-yfsjK2YL6bXASGvv — 204 — 17 B — 17 ms — h3https://pagead2.googlesyndication.com/pcs/activeview?xai=AKAOjsvgIOyCX1k9WrjgjS_moVHYp5w4lh_SVO2zYlQQykIak-IIzvJdvIHOnrTn-hDp7criYbu0Qm-8NdwmizUzmqsCpll9TpkO5o-SgNDiolBnta630qEoQivFZhiwLVL7Nc47Sao2dAZs2y0zywCFjBj_e3dxsbr3QyGhdo8VH7S26OTCONhhxYRU8A&sig=Cg0ArKJSzIMbO2Ba4wncEAE&id=lidar2&mcvt=1000&p=10,318,100,1046&tm=1040.1999998092651&tu=40.09999990463257&mtos=1000,1000,1000,1000,1000&tos=1000,0,0,0,0&v=20260420&bin=7&avms=nio&bs=1350,940&mc=1&vu=1&app=0&itpl=0&adk=482972057&rs=4&la=0&cr=0&uach=WyJtYWNPUyIsIjEwLjE1LjciLCJ4ODYiLCIiLCIxNDYuMC4wLjAiLG51bGwsMCxudWxsLCI2NCIsW1siTm90LUEuQnJhbmQiLCIyNC4wLjAuMCJdLFsiQ2hyb21pdW0iLCIxNDYuMC43NjgwLjE2NCJdXSwwXQ%3D%3D&vs=4&r=v&co=7273065300&rst=1776797853398&rpt=201&isd=0&lsd=0&met=mue&wmsd=0&pbe=0&fle=0&vae=0&spb=0&sfl=0&ffslot=0&reach=8&io2=0pagead2.googlesyndication.com/pcs/a... https://pagead2.googlesyndication.com/pcs/activeview?xai=AKAOjsvgIOyCX1k9WrjgjS_moVHYp5w4lh_SVO2zYlQQykIak-IIzvJdvIHOnrTn-hDp7criYbu0Qm-8NdwmizUzmqsCpll9TpkO5o-SgNDiolBnta630qEoQivFZhiwLVL7Nc47Sao2dAZs2y0zywCFjBj_e3dxsbr3QyGhdo8VH7S26OTCONhhxYRU8A&sig=Cg0ArKJSzIMbO2Ba4wncEAE&id=lidar2&mcvt=1000&p=10,318,100,1046&tm=1040.1999998092651&tu=40.09999990463257&mtos=1000,1000,1000,1000,1000&tos=1000,0,0,0,0&v=20260420&bin=7&avms=nio&bs=1350,940&mc=1&vu=1&app=0&itpl=0&adk=482972057&rs=4&la=0&cr=0&uach=WyJtYWNPUyIsIjEwLjE1LjciLCJ4ODYiLCIiLCIxNDYuMC4wLjAiLG51bGwsMCxudWxsLCI2NCIsW1siTm90LUEuQnJhbmQiLCIyNC4wLjAuMCJdLFsiQ2hyb21pdW0iLCIxNDYuMC43NjgwLjE2NCJdXSwwXQ%3D%3D&vs=4&r=v&co=7273065300&rst=1776797853398&rpt=201&isd=0&lsd=0&met=mue&wmsd=0&pbe=0&fle=0&vae=0&spb=0&sfl=0&ffslot=0&reach=8&io2=0 — 200 — 65 B — 15 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2443ms · 731KB · $32/mo
www.thelancet.com
Other
Costly
Execution 1124ms
Transfer 56 KB
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 312ms
Transfer 0 KB
Monthly Cost $4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 307ms
Transfer 188 KB
Unused 53%
Monthly Cost $4/mo
www.thelancet.com
Other
Costly
Execution 233ms
Transfer 217 KB
Unused 69%
Monthly Cost $3/mo
pagead2.googlesyndication.com
Other
Optional
Execution 132ms
Transfer 73 KB
Unused 42%
Monthly Cost $2/mo
www.thelancet.com
Other
Optional
Execution 117ms
Transfer 0 KB
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 110ms
Transfer 119 KB
Unused 52%
Monthly Cost $1/mo
www.thelancet.com
Other
Optional
Execution 58ms
Transfer 10 KB
Monthly Cost $1/mo
www.thelancet.com
Other
Optional
Execution 50ms
Transfer 68 KB
Unused 76%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.thelancet.com adds 1124ms and costs ~$15/month
  • Unattributable adds 312ms and costs ~$4/month
  • securepubads.g.doubleclick.net adds 307ms and costs ~$4/month
  • www.thelancet.com adds 233ms and costs ~$3/month

100% 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

www.thelancet.com takes 1124ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 312ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

securepubads.g.doubleclick.net takes 307ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

53% of securepubads.g.doubleclick.net'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

www.thelancet.com takes 233ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

69% of www.thelancet.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

52% of OneTrust'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

76% of www.thelancet.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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