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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
85
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.

1.51 s

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

2.49 s

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

6 ms

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

0.386

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

2.16 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.

2.51 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
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 69 requests
FIX
2.1 MB transferred, 69 requests
Info::
Page weighs 5.4 MB (2.1 MB transferred)
Warning::
JavaScript is 596 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 596 KB
Info::
Fonts are 347 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 347 KB
Info::
CSS is 206 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 206 KB
Info::
69 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
69 requests
0.44 g CO2 per page load
Images 865.8 KiB 41%
JavaScript 595.6 KiB 28%
Fonts 346.5 KiB 16%
CSS 206.1 KiB 10%
HTML 52.8 KiB 2%
Other 42.6 KiB 2%
Other 11.0 KiB 1%
Other 5.0 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
69 resources · 2.1 MB · 220 KB savings available
FIX
69 resources · 2.1 MB · 220 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~220 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
2 resources over 200KB
69 resources · 2.1 MiB · 68 third-party 1.1 MiB over 1MB target
Image 41% · 868.1 KiB
JavaScript 28% · 595.6 KiB
Font 16% · 346.5 KiB
CSS 10% · 210.6 KiB
Document 3% · 53.4 KiB
Other 2% · 51.1 KiB

~220.2 KiB of savings available

Remove unused JavaScript: 220.2 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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://www.cell.com/templates/jsp/_style2/_marlin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/cms/asset/c6a7b689-b779-4ba4-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/ux3/logos/cell/Cell... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/cms/asset/28755260-75aa-4982-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/templates/jsp/_style2/_marlin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb/assets/raw/Health%20Advanc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/cms/asset/add17ada-541a-49fe-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cell.com/pb-assets/journals/platform/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 866 KB
0 oversized -0 KB
17 legacy format
15 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

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

B
JS Execution Cost
723ms total JS execution
REVIEW
723ms total JS execution
Warning::
https://www.cell.com/: 312ms CPU time
Info::
Unattributable: 158ms CPU time
Info::
https://www.cell.com/wro/f03726d8be65c99af4dc13935...: 97ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 83ms CPU time
Info::
https://www.cell.com/cdn-cgi/challenge-platform/sc...: 73ms CPU time
Warning::
Third-party scripts: 723ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 22% Style & Layout 16% Script Parsing & Compilation 6% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.cell.com/312ms137ms7ms3rd
Unattributable158ms28ms0ms3rd
https://www.cell.com/wro/f03726d8be65c99af4dc13935c7996e819a5ff0d~product.js97ms33ms18ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js83ms56ms15ms3rd
https://www.cell.com/cdn-cgi/challenge-platform/scripts/jsd/main.js73ms70ms1ms3rd
C
JS Bundles
Action
10 scripts, 220 KB unused
REVIEW
10 scripts, 220 KB unused
Warning::
https://www.cell.com/wro/f03726d8be65c99af4dc13935...: 121 KB unused (75%)
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.cell.com/products/marlin/cell/released...: 37 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 220 KB
220 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cell.com/wro/f03726d8be65c99af4dc13935c7996e819a5ff0d~product.js161 KB121 KB (75%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119 KB62 KB (52%)✓3rd
https://www.cell.com/products/marlin/cell/releasedAssets/js/selected.bundle-68190d98c6bae3967461.js54 KB37 KB (69%)✓3rd
https://www.cell.com/products/marlin/cell/releasedAssets/js/main.bundle-94af90bc2cdf9df6dca8.js218 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.cell.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://www.cell.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1177.min.js14 KB—✓3rd
https://bam.nr-data.net/1/16e2192192?a=916957862&sa=1&v=1177.96a4d39&t=Unnamed%20Transaction&rst=1694&ck=1&ref=https://www.cell.com/&be=999&fe=1573&dc=1331&af=err,xhr,stn,ins,spa&perf=%7B%22timing%22:%7B%22of%22:1776799252254,%22n%22:0,%22f%22:795,%22dn%22:795,%22dne%22:795,%22c%22:795,%22ce%22:795,%22rq%22:796,%22rp%22:912,%22rpe%22:1091,%22dl%22:919,%22di%22:1297,%22ds%22:1331,%22de%22:1450,%22dc%22:1573,%22l%22:1573,%22le%22:1577%7D,%22navigation%22:%7B%7D%7D&fp=1104&fcp=1216&jsonp=NREUM.setToken1 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

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
9 fonts (347 KB)
PASS
9 fonts (347 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

347 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.5 shttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon/fonts/icomoon-c58c472f6dbb45c5ac335f7082fa4413.wofficomoon-c58c472f6dbb45c... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon/fonts/icomoon-c58c472f6dbb45c5ac335f7082fa4413.woff — 41.9 KiB — 56 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon-d4d19ebe45b4314fc5be87fcc256cbf5.ttficomoon-d4d19ebe45b4314... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon-d4d19ebe45b4314fc5be87fcc256cbf5.ttf — 31.9 KiB — 37 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansWebPro-d1d294e8281aca867fcd5828107e5c75.woff2NexusSansWebPro-d1d294e... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansWebPro-d1d294e8281aca867fcd5828107e5c75.woff2 — 70.4 KiB — 31 ms — font-display: swaphttps://www.cell.com/templates/jsp/_style2/_marlin/pb2/fonts/elsevierwordmark-regular-OA.woffelsevierwordmark-regula... https://www.cell.com/templates/jsp/_style2/_marlin/pb2/fonts/elsevierwordmark-regular-OA.woff — 4.8 KiB — 22 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/elsevierwordmark-regular-OA-abed222f9c69c4a4e2e7f8c991402c04.woff2elsevierwordmark-regula... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/elsevierwordmark-regular-OA-abed222f9c69c4a4e2e7f8c991402c04.woff2 — 4.9 KiB — 30 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/elsevierwordmark-regular-OA-429993f3c95c7233c4162287acb8d36a.ttfelsevierwordmark-regula... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/elsevierwordmark-regular-OA-429993f3c95c7233c4162287acb8d36a.ttf — 4.6 KiB — 29 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansOffcPro-35ae3983ec06c363da48670566c43eed.ttfNexusSansOffcPro-35ae39... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansOffcPro-35ae3983ec06c363da48670566c43eed.ttf — 56.1 KiB — 35 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansWebPro-Bold-dfad421c3860b40a209dabe6b543d2ce.woff2NexusSansWebPro-Bold-df... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansWebPro-Bold-dfad421c3860b40a209dabe6b543d2ce.woff2 — 74.2 KiB — 45 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansOffcPro-Bold-36eb261c0f060d3fe3fa1cb0e54673e7.ttfNexusSansOffcPro-Bold-3... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/NexusSansOffcPro-Bold-36eb261c0f060d3fe3fa1cb0e54673e7.ttf — 57.7 KiB — 48 ms — font-display: swap
icomoon-c58c472f6dbb45c... woff swap
Size 42 KB
Load time 56 ms
Start 922 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon-d4d19ebe45b4314... ttf swap
Size 32 KB
Load time 37 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NexusSansWebPro-d1d294e... woff2 swap
Size 70 KB
Load time 31 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... woff swap
Size 5 KB
Load time 22 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
elsevierwordmark-regula... woff2 swap
Size 5 KB
Load time 30 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... ttf swap
Size 5 KB
Load time 29 ms
Start 1.7 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 1.7 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 45 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NexusSansOffcPro-Bold-3... ttf swap
Size 58 KB
Load time 48 ms
Start 1.8 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 ~59 KB and ~118 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
69 requests over 1941ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.5 shttps://cell.com// https://cell.com/ — 302 — 1.7 KiB — 176 ms — h2https://id.elsevier.com/as/authorization.oauth2?platSite=LT%2Fcell&response_type=code&client_id=JBS&additionalPlatSites=LT%2Fjbs%2CSD%2Fscience%2CLT%2Fthelancet%2CLT%2Fgeneric&site=cell-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.cell.com%2Fcallback%3Fred_uri%3D%252F&state=17311886487&authType=SINGLE_SIGN_IN&client_name=Cell+Press&prompt=noneid.elsevier.com/as/authorization.oa... https://id.elsevier.com/as/authorization.oauth2?platSite=LT%2Fcell&response_type=code&client_id=JBS&additionalPlatSites=LT%2Fjbs%2CSD%2Fscience%2CLT%2Fthelancet%2CLT%2Fgeneric&site=cell-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.cell.com%2Fcallback%3Fred_uri%3D%252F&state=17311886487&authType=SINGLE_SIGN_IN&client_name=Cell+Press&prompt=none — 302 — 670 B — 176 ms — h2https://www.cell.com/callback?red_uri=%2F&code=snFgesVcD7n7cB3kL93K6sU3IZ8q_Bpg9igZXy0O&state=17311886487www.cell.com/callback?red_uri=%2F&c... https://www.cell.com/callback?red_uri=%2F&code=snFgesVcD7n7cB3kL93K6sU3IZ8q_Bpg9igZXy0O&state=17311886487 — 302 — 860 B — 440 ms — h3https://www.cell.com/www.cell.com/ https://www.cell.com/ — 200 — 52.8 KiB — 295 ms — 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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
100% of JavaScript execution is third-party
First-party Third-party 723ms · 333KB · $10/mo
www.cell.com
Other
Costly
Execution 312ms
Transfer 53 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 158ms
Transfer 0 KB
Monthly Cost $2/mo
www.cell.com
Other
Optional
Execution 97ms
Transfer 161 KB
Unused 75%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 83ms
Transfer 119 KB
Unused 52%
Monthly Cost $1/mo
www.cell.com
Other
Optional
Execution 73ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cell.com adds 312ms and costs ~$4/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.cell.com 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

75% of www.cell.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

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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