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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.72 s

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

2.74 s

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

118 ms

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

0.000

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

1.88 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.

4.50 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 75 requests
FIX
3.6 MB transferred, 75 requests
Warning::
Page weighs 10.1 MB (3.6 MB transferred)
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Info::
75 HTTP requests
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
75 requests
0.76 g CO2 per page load
JavaScript 2.3 MiB 63%
Images 597.2 KiB 16%
Other 384.9 KiB 10%
CSS 154.5 KiB 4%
HTML 114.4 KiB 3%
Fonts 102.6 KiB 3%
Other 3.0 KiB 0%
Other 643 B 0%
Other 244 B 0%
Other 0 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

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 (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
20 scripts, 820 KB unused
FIX
20 scripts, 820 KB unused
Warning::
https://www.frontiersin.org/home-page-2022/_nuxt/9...: 443 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tag-manager.frontiersin.org/gtm.js?id=GTM-...: 80 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tag-manager.frontiersin.org/gtag/js?id=G-M...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tag-manager.frontiersin.org/gtm.js?id=GTM-...: 65 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tag-manager.frontiersin.org/gtm.js?id=GTM-...: 65 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 820 KB
820 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.frontiersin.org/home-page-2022/_nuxt/90bd734.js666 KB443 KB (67%)✓3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-PQWSNCJ&gtm_auth=0HxnYwqN2wpANrd769hTJg&gtm_preview=env-1&gtm_cookies_win=x171 KB80 KB (47%)✓3rd
https://tag-manager.frontiersin.org/gtag/js?id=G-MF9DGCL3QL&cx=c&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_20260421167 KB67 KB (40%)✓3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-N7NBS8L&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_20260421113 KB65 KB (58%)✓3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-NB25PW2W&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_20260421114 KB65 KB (57%)✓3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-WKF68V4&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_20260421137 KB63 KB (46%)✓3rd
https://www.frontiersin.org/home-page-2022/_nuxt/f07b8ec.js91 KB37 KB (41%)✓3rd
https://static.doubleclick.net/instream/ad_status.js0 KB—✓3rd
https://www.frontiersin.org/home-page-2022/_nuxt/fa45311.js1 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb146 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
75 resources · 3.6 MB · 820 KB savings available
FIX
75 resources · 3.6 MB · 820 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~820 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
2 resources over 200KB
75 resources · 3.6 MiB · 74 third-party 2.6 MiB over 1MB target
JavaScript 63% · 2.3 MiB
Image 26% · 983.7 KiB
CSS 4% · 154.5 KiB
Document 3% · 114.5 KiB
Font 3% · 102.6 KiB
Other 0% · 2.3 KiB

~820.2 KiB of savings available

Remove unused JavaScript: 820.2 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
JS Execution Cost
Action
1003ms total JS execution
REVIEW
1003ms total JS execution
Warning::
https://www.frontiersin.org/home-page-2022/_nuxt/0...: 252ms CPU time
Info::
https://www.frontiersin.org/home-page-2022/_nuxt/9...: 175ms CPU time
Info::
https://www.frontiersin.org/: 173ms CPU time
Info::
https://tag-manager.frontiersin.org/gtm.js?id=GTM-...: 123ms CPU time
Info::
https://tag-manager.frontiersin.org/gtm.js?id=GTM-...: 83ms CPU time
Warning::
Third-party scripts: 1003ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Script Parsing & Compilation 15% Other 14% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://www.frontiersin.org/home-page-2022/_nuxt/0d024db.js252ms232ms6ms3rd
https://www.frontiersin.org/home-page-2022/_nuxt/90bd734.js175ms40ms78ms3rd
https://www.frontiersin.org/173ms34ms13ms3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-WKF68V4&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_20260421123ms109ms11ms3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-PQWSNCJ&gtm_auth=0HxnYwqN2wpANrd769hTJg&gtm_preview=env-1&gtm_cookies_win=x83ms72ms10ms3rd
Unattributable76ms3ms0ms3rd
https://tag-manager.frontiersin.org/gtag/js?id=G-MF9DGCL3QL&cx=c&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_2026042168ms54ms13ms3rd
https://tag-manager.frontiersin.org/gtm.js?id=GTM-N7NBS8L&gtm=4e64h1&sign=8e4fbc65576303a46bdfeff81170d4fe1ba9035a12251e7527ea8b5482a17071_2026042153ms38ms15ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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+
Image Optimization
15 images, 0 KB saveable
PASS
15 images, 0 KB saveable
Info::
All images are well-optimized
15 images 597 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
5 fonts (103 KB)
PASS
5 fonts (103 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

103 KB total

Render-blocking

0

of 5

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 1.7 s LCP 2.7 shttps://static2.frontiersin.org/static-resources/MuseoSans500.woff2MuseoSans500.woff2 https://static2.frontiersin.org/static-resources/MuseoSans500.woff2 — 17.9 KiB — 156 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 70 ms — font-display: swaphttps://static2.frontiersin.org/static-resources/FrontiersIconography.woff2FrontiersIconography.woff2 https://static2.frontiersin.org/static-resources/FrontiersIconography.woff2 — 15.0 KiB — 140 ms — font-display: swaphttps://static2.frontiersin.org/static-resources/MuseoSans700.woff2MuseoSans700.woff2 https://static2.frontiersin.org/static-resources/MuseoSans700.woff2 — 18.0 KiB — 163 ms — font-display: swaphttps://static2.frontiersin.org/static-resources/MuseoSans300.woff2MuseoSans300.woff2 https://static2.frontiersin.org/static-resources/MuseoSans300.woff2 — 17.7 KiB — 156 ms — font-display: swap
MuseoSans500.woff2 woff2 swap
Size 18 KB
Load time 156 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 70 ms
Start 558 ms
Risk FOUT — text flashes from fallback to web font
FrontiersIconography.woff2 woff2 swap
Size 15 KB
Load time 140 ms
Start 559 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans700.woff2 woff2 swap
Size 18 KB
Load time 163 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans300.woff2 woff2 swap
Size 18 KB
Load time 156 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
75 requests over 3914ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.7 s LCP 2.7 shttps://frontiersin.org// https://frontiersin.org/ — 301 — 47 B — 103 ms — h2https://www.frontiersin.org/www.frontiersin.org/ https://www.frontiersin.org/ — 200 — 57.9 KiB — 246 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/90e9a74.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/90e9a74.js — 200 — 2.4 KiB — 74 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/f07b8ec.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/f07b8ec.js — 200 — 90.6 KiB — 149 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/css/52ad924.csswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/css/52ad924.css — 200 — 40.5 KiB — 63 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/90bd734.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/90bd734.js — 200 — 666.2 KiB — 188 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/css/70fec71.csswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/css/70fec71.css — 200 — 9.7 KiB — 78 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/0d024db.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/0d024db.js — 200 — 37.7 KiB — 115 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/css/f230d39.csswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/css/f230d39.css — 200 — 1.2 KiB — 89 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/7ba9e68.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/7ba9e68.js — 200 — 2.3 KiB — 73 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/css/c842d74.csswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/css/c842d74.css — 200 — 783 B — 77 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/fa45311.jswww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/fa45311.js — 200 — 1.3 KiB — 94 ms — h2https://d2csxpduxe849s.cloudfront.net/media/E32629C6-9347-4F84-81FEAEF7BFA342B3/736B937B-CCA4-4440-B731C5C595C623EA/WebsiteWebP_XL-shutterstock_1895343883.webpd2csxpduxe849s.cloudfront.net/media... https://d2csxpduxe849s.cloudfront.net/media/E32629C6-9347-4F84-81FEAEF7BFA342B3/736B937B-CCA4-4440-B731C5C595C623EA/WebsiteWebP_XL-shutterstock_1895343883.webp — 200 — 112.6 KiB — 101 ms — h2https://brand.frontiersin.org/asset/3b3a148c-bc59-4bea-b9cb-fe26ac5ef292/WebsiteWebP_M/Homepage_Find-a-journal.webpbrand.frontiersin.org/asset/3b3a148... https://brand.frontiersin.org/asset/3b3a148c-bc59-4bea-b9cb-fe26ac5ef292/WebsiteWebP_M/Homepage_Find-a-journal.webp — 200 — 44.2 KiB — 86 ms — h2https://www.youtube.com/embed/jLJ7ZO3wOW4?rel=0&autoplay=0&mute=0&controls=1&cc_load_policy=0www.youtube.com/embed/jLJ7ZO3wOW4?r... https://www.youtube.com/embed/jLJ7ZO3wOW4?rel=0&autoplay=0&mute=0&controls=1&cc_load_policy=0 — 200 — 56.6 KiB — 165 ms — h2https://d2csxpduxe849s.cloudfront.net/media/E32629C6-9347-4F84-81FEAEF7BFA342B3/9B31537D-70FD-4F04-A8D7DE5339935284/WebsiteWebP_M-shutterstock_1815514430.webpd2csxpduxe849s.cloudfront.net/media... https://d2csxpduxe849s.cloudfront.net/media/E32629C6-9347-4F84-81FEAEF7BFA342B3/9B31537D-70FD-4F04-A8D7DE5339935284/WebsiteWebP_M-shutterstock_1815514430.webp — 200 — 91.1 KiB — 107 ms — h2https://brand.frontiersin.org/asset/8a7a0253-89a9-429f-a314-8efe8a69e38e/WebsiteWebP_M/In-the-Research-Laboratory-Smart-African-American-Female-Scientist-Wearing-White-Coat-and-Protective-Glasses-Writes-Formula-on-Glass-Whiteboard-References-Her-Tablet-Computer.webpbrand.frontiersin.org/asset/8a7a025... https://brand.frontiersin.org/asset/8a7a0253-89a9-429f-a314-8efe8a69e38e/WebsiteWebP_M/In-the-Research-Laboratory-Smart-African-American-Female-Scientist-Wearing-White-Coat-and-Protective-Glasses-Writes-Formula-on-Glass-Whiteboard-References-Her-Tablet-Computer.webp — 200 — 25.4 KiB — 84 ms — h2https://brand.frontiersin.org/asset/7e3fed46-86be-4f97-87e7-ed62bb167ace/WebsiteWebP_M/Engineers-male-flying-drone-surveying-and-checking-wind-turbines-from-the-high-angle-view-of-the-field-during-beautiful-sunset-using-drone-technology-for-work.webpbrand.frontiersin.org/asset/7e3fed4... https://brand.frontiersin.org/asset/7e3fed46-86be-4f97-87e7-ed62bb167ace/WebsiteWebP_M/Engineers-male-flying-drone-surveying-and-checking-wind-turbines-from-the-high-angle-view-of-the-field-during-beautiful-sunset-using-drone-technology-for-work.webp — 200 — 16.6 KiB — 86 ms — h2https://brand.frontiersin.org/asset/fe1f84ba-fd90-4b48-9c9d-d59318fb6ff7/WebsiteWebP_M/Female-Scientist-Sits-at-His-Workplace-in-Laboratory-Uses-Personal-Computer-Screen-Shows-Analyze-of-DNA-I-the-Background-Genetics-Research-Centre-with-Innovative-Equipment.webpbrand.frontiersin.org/asset/fe1f84b... https://brand.frontiersin.org/asset/fe1f84ba-fd90-4b48-9c9d-d59318fb6ff7/WebsiteWebP_M/Female-Scientist-Sits-at-His-Workplace-in-Laboratory-Uses-Personal-Computer-Screen-Shows-Analyze-of-DNA-I-the-Background-Genetics-Research-Centre-with-Innovative-Equipment.webp — 200 — 30.2 KiB — 103 ms — h2https://brand.frontiersin.org/asset/6143602b-1e87-45dc-872c-2fba6c6780c3/WebsiteWebP_M/AR25_Thumb-website.webpbrand.frontiersin.org/asset/6143602... https://brand.frontiersin.org/asset/6143602b-1e87-45dc-872c-2fba6c6780c3/WebsiteWebP_M/AR25_Thumb-website.webp — 200 — 20.7 KiB — 89 ms — h2https://brand.frontiersin.org/asset/ad9b058e-1626-4e6e-9e45-f4069875edbf/WebsiteWebP_M/FSCI_Hub_Locke_Nature_positive_Hub-card.webpbrand.frontiersin.org/asset/ad9b058... https://brand.frontiersin.org/asset/ad9b058e-1626-4e6e-9e45-f4069875edbf/WebsiteWebP_M/FSCI_Hub_Locke_Nature_positive_Hub-card.webp — 200 — 60.8 KiB — 97 ms — h2https://www.frontiersin.org/home-page-2022/_nuxt/manifest.e33bfb31.jsonwww.frontiersin.org/home-page-2022/... https://www.frontiersin.org/home-page-2022/_nuxt/manifest.e33bfb31.json — 200 — 643 B — 156 ms — h2https://brand.frontiersin.org/asset/53dc2a05-bd58-4d6c-bb45-cbd757fe7dd2/WebsiteWebP_M/Artificial-intelligence-Microchip-and-brain-shaped-connections-Electric-pulses-binary-codes-brain-activity-3D-illustration.webpbrand.frontiersin.org/asset/53dc2a0... 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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 1003ms · 1349KB · €11/mo
www.frontiersin.org
Other
Costly
Execution 252ms
Transfer 38 KB
Monthly Cost €3/mo
www.frontiersin.org
Other
Optional
Execution 175ms
Transfer 666 KB
Unused 67%
Monthly Cost €2/mo
www.frontiersin.org
Other
Optional
Execution 173ms
Transfer 58 KB
Monthly Cost €2/mo
tag-manager.frontiersin.org
Other
Optional
Execution 123ms
Transfer 137 KB
Unused 46%
Monthly Cost €1/mo
tag-manager.frontiersin.org
Other
Optional
Execution 83ms
Transfer 171 KB
Unused 47%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 76ms
Transfer 0 KB
Monthly Cost €1/mo
tag-manager.frontiersin.org
Other
Optional
Execution 68ms
Transfer 167 KB
Unused 40%
Monthly Cost €1/mo
tag-manager.frontiersin.org
Other
Optional
Execution 53ms
Transfer 113 KB
Unused 58%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.frontiersin.org adds 252ms 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.frontiersin.org takes 252ms 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

67% of www.frontiersin.org'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

58% of tag-manager.frontiersin.org'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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