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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

5.99 s

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

12.38 s

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

228 ms

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

0.270

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

6.82 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.

12.54 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
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 70 requests
FIX
2.1 MB transferred, 70 requests
Info::
Page weighs 5.5 MB (2.1 MB transferred)
Warning::
JavaScript is 597 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 597 KB
Info::
Fonts are 370 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 370 KB
Info::
CSS is 204 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 204 KB
Info::
70 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
70 requests
0.44 g CO2 per page load
Images 864.9 KiB 40%
JavaScript 597.5 KiB 28%
Fonts 370.5 KiB 17%
CSS 204.4 KiB 10%
HTML 53.2 KiB 2%
Other 42.6 KiB 2%
Other 10.9 KiB 1%
Other 4.3 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
JS Execution Cost
Action
2835ms total JS execution
FIX
2835ms total JS execution
Warning::
https://www.cell.com/: 1212ms CPU time
Warning::
Unattributable: 540ms CPU time
Warning::
https://www.cell.com/wro/f03726d8be65c99af4dc13935...: 370ms CPU time
Warning::
https://www.cell.com/cdn-cgi/challenge-platform/sc...: 290ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 287ms CPU time
Warning::
Third-party scripts: 2835ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 21% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.cell.com/1212ms521ms34ms3rd
Unattributable540ms114ms0ms3rd
https://www.cell.com/wro/f03726d8be65c99af4dc13935c7996e819a5ff0d~product.js370ms132ms71ms3rd
https://www.cell.com/cdn-cgi/challenge-platform/scripts/jsd/main.js290ms277ms4ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js287ms188ms59ms3rd
https://www.cell.com/products/marlin/cell/releasedAssets/js/selected.bundle-68190d98c6bae3967461.js136ms62ms30ms3rd
D
Page Weight Inventory
Action
70 resources · 2.1 MB · 220 KB savings available
FIX
70 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::
69 third-party resources (100% of weight)
Info::
2 resources over 200KB
70 resources · 2.1 MiB · 69 third-party 1.1 MiB over 1MB target
Image 40% · 867.3 KiB
JavaScript 28% · 597.5 KiB
Font 17% · 370.5 KiB
CSS 10% · 208.8 KiB
Document 3% · 53.9 KiB
Other 2% · 50.3 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/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/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/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/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/raw/Health%20Advanc... 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/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.
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 865 KB
0 oversized -0 KB
17 legacy format
14 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

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.js216 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/v8c78df7c7c0f484497ecbca7046644da177152312451611 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=1739&ck=1&ref=https://www.cell.com/&be=940&fe=1645&dc=1420&af=err,xhr,stn,ins,spa&perf=%7B%22timing%22:%7B%22of%22:1776799234641,%22n%22:0,%22f%22:739,%22dn%22:739,%22dne%22:739,%22c%22:739,%22ce%22:739,%22rq%22:740,%22rp%22:847,%22rpe%22:1241,%22dl%22:855,%22di%22:1386,%22ds%22:1420,%22de%22:1541,%22dc%22:1645,%22l%22:1645,%22le%22:1698%7D,%22navigation%22:%7B%7D%7D&fp=1032&fcp=1224&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
10 fonts (370 KB)
PASS
10 fonts (370 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

370 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 12.4 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 — 30 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 — 1.4 KiB — 23 ms — font-display: swaphttps://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon-9b190c0d34d75fced356e3b0a1c0b523.wofficomoon-9b190c0d34d75fc... https://www.cell.com/products/marlin/cell/releasedAssets/fonts/icomoon-9b190c0d34d75fced356e3b0a1c0b523.woff — 54.2 KiB — 31 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 — 70.5 KiB — 26 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 — 20 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 — 17 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 — 20 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 — 56.3 KiB — 30 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 — 74.3 KiB — 25 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 — 57.6 KiB — 31 ms — font-display: swap
icomoon-c58c472f6dbb45c... woff swap
Size 42 KB
Load time 30 ms
Start 857 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon-d4d19ebe45b4314... ttf swap
Size 1 KB
Load time 23 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon-9b190c0d34d75fc... woff swap
Size 54 KB
Load time 31 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 26 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... woff swap
Size 5 KB
Load time 20 ms
Start 1.7 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 17 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
elsevierwordmark-regula... ttf swap
Size 5 KB
Load time 20 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 30 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 25 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
NexusSansOffcPro-Bold-3... ttf swap
Size 58 KB
Load time 31 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 ~66 KB and ~132 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
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
70 requests over 2171ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 12.4 shttps://cell.com// https://cell.com/ — 302 — 1.1 KiB — 129 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=17311887105&authType=SINGLE_SIGN_IN&client_name=Cell+Press&prompt=noneid.elsevier.com/as/authorization.oa... 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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 2835ms · 388KB · $38/mo
www.cell.com
Other
Costly
Execution 1212ms
Transfer 53 KB
Monthly Cost $16/mo
Unattributable
Other
Costly
Execution 540ms
Transfer 0 KB
Monthly Cost $7/mo
www.cell.com
Other
Costly
Execution 370ms
Transfer 161 KB
Unused 75%
Monthly Cost $5/mo
www.cell.com
Other
Costly
Execution 290ms
Transfer 0 KB
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 287ms
Transfer 119 KB
Unused 52%
Monthly Cost $4/mo
www.cell.com
Other
Optional
Execution 136ms
Transfer 54 KB
Unused 69%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.cell.com adds 1212ms and costs ~$16/month
  • Unattributable adds 540ms and costs ~$7/month
  • www.cell.com adds 370ms and costs ~$5/month
  • www.cell.com adds 290ms 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 1212ms 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 540ms 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

www.cell.com takes 370ms 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

www.cell.com takes 290ms 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

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

69% 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

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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