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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

1.47 s

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

1.95 s

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

26 ms

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

0.037

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

1.86 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.

2.96 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
5 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 102 requests
FIX
2.3 MB transferred, 102 requests
Info::
Page weighs 7.0 MB (2.3 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
CSS is 350 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 350 KB
Warning::
102 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.49 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
102 requests
0.49 g CO2 per page load
JavaScript 1.2 MiB 51%
Images 563.3 KiB 24%
CSS 350.2 KiB 15%
Fonts 133.6 KiB 6%
Other 57.8 KiB 2%
HTML 30.0 KiB 1%
Other 14.3 KiB 1%
Other 12.0 KiB 1%
Other 770 B 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

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

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
25 scripts, 715 KB unused
FIX
25 scripts, 715 KB unused
Warning::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 366 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://maps.googleapis.com/maps/api/js?key=AIzaSy...: 103 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202602.1...: 69 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 60 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-4.convertexperiments.com/v1/js/1003489...: 51 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 715 KB
715 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nature.org/etc.clientlibs/tnc/clientlibs/vendor.min.ACSHASH7b99867e75cafc3d75f73d0a7af662a8.js496 KB366 KB (74%)✓3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyAnYGyE3Th7oLcfOVj033hp99iFdlmwMxc&libraries=geometry,visualization,places182 KB103 KB (57%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js129 KB69 KB (54%)✓3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/templates/homepage.min.ACSHASH7c6fd9bbe9f1e3dbbeb808ae133b1fc2.js75 KB60 KB (81%)✓3rd
https://cdn-4.convertexperiments.com/v1/js/10034899-10032903.js?environment=production88 KB51 KB (58%)✓3rd
https://tags.tiqcdn.com/utag/tnc/global/prod/utag.js62 KB35 KB (57%)✓3rd
https://cdn.jsdelivr.net/gh/ableplayer/ableplayer@4.7/build/ableplayer.min.js68 KB31 KB (86%)✓3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/granite/csrf.min.ACSHASH62044ae05bdebf846af0e91ed3a40252.js2 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/common.min.ACSHASHb930dded9abc20364db248718f779489.js10 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
102 resources · 2.3 MB · 715 KB savings available
FIX
102 resources · 2.3 MB · 715 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~715 KB of savings available
Warning::
101 third-party resources (100% of weight)
Info::
2 resources over 200KB
102 resources · 2.3 MiB · 101 third-party 1.3 MiB over 1MB target
JavaScript 51% · 1.2 MiB
Image 24% · 578.8 KiB
CSS 15% · 354.9 KiB
Font 6% · 133.6 KiB
Other 3% · 62.7 KiB
Document 1% · 31.9 KiB

~715.2 KiB of savings available

Remove unused JavaScript: 715.2 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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://natureconservancy-h.assetsadobe.com/is/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nature.org/content/dam/tnc/nature/en/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 563 KB
0 oversized -0 KB
23 legacy format
9 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

Performance issues directly impact user engagement and conversion rates.

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 Execution Cost
Action
1039ms total JS execution
REVIEW
1039ms total JS execution
Warning::
https://www.nature.org/en-us/: 449ms CPU time
Info::
Unattributable: 176ms CPU time
Info::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 102ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202602.1...: 75ms CPU time
Info::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 66ms CPU time
Warning::
Third-party scripts: 1039ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 28% Style & Layout 19% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.nature.org/en-us/449ms5ms1ms3rd
Unattributable176ms17ms0ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/vendor.min.ACSHASH7b99867e75cafc3d75f73d0a7af662a8.js102ms58ms41ms3rd
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js75ms50ms11ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/templates/homepage.min.ACSHASH7c6fd9bbe9f1e3dbbeb808ae133b1fc2.js66ms43ms8ms3rd
https://tags.tiqcdn.com/utag/tnc/global/prod/utag.js66ms58ms7ms3rd
https://cdn-4.convertexperiments.com/v1/js/10034899-10032903.js?environment=production54ms42ms8ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyAnYGyE3Th7oLcfOVj033hp99iFdlmwMxc&libraries=geometry,visualization,places51ms29ms20ms3rd
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+
Font Loading
14 fonts (134 KB)
PASS
14 fonts (134 KB)
Info::
14 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

14

134 KB total

Render-blocking

0

of 14

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 FCP 1.5 s LCP 2.0 sdata:application/x-font-woff2;base64,d09GMk9UVE8AADOQAA0AAAAAazAAADM+AAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADOQAA0AAAAAazAAADM+AAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 12.9 KiB — 117 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADOUAA0AAAAAa1gAADNDAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADOUAA0AAAAAa1gAADNDAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 12.9 KiB — 122 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADJAAA0AAAAAahgAADHtAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADJAAA0AAAAAahgAADHtAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 12.6 KiB — 130 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADtoAA0AAAAAgrgAADsVAAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADtoAA0AAAAAgrgAADsVAAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 14.9 KiB — 130 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADz0AA0AAAAAg3QAADyhAAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADz0AA0AAAAAg3QAADyhAAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 15.2 KiB — 137 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADO8AA0AAAAAargAADNqAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADO8AA0AAAAAargAADNqAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 12.9 KiB — 139 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AADq0AA0AAAAAgcQAADpjAAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADq0AA0AAAAAgcQAADpjAAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 14.7 KiB — 140 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABUEAAsAAAAAJFgAABS5AAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABUEAAsAAAAAJFgAABS5AAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.3 KiB — 134 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABT0AAsAAAAAJBAAABSpAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABT0AAsAAAAAJBAAABSpAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.2 KiB — 139 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABUAAAsAAAAAJFAAABSzAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABUAAAsAAAAAJFAAABSzAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.2 KiB — 130 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABZAAAsAAAAAJSwAABX1AAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABZAAAsAAAAAJSwAABX1AAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.6 KiB — 127 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABZMAAsAAAAAJVwAABYBAAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABZMAAsAAAAAJVwAABYBAAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.6 KiB — 123 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABUUAAsAAAAAJDwAABTIAAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABUUAAsAAAAAJDwAABTIAAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.3 KiB — 120 ms — font-display: swapdata:application/x-font-woff2;base64,d09GMk9UVE8AABW8AAsAAAAAJPgAABVyAAEztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AABW8AAsAAAAAJPgAABVyAAEztgAAAAAAAAAAAAAAAAAAAAAAAA… — 5.4 KiB — 117 ms — font-display: swap
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 117 ms
Start 756 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 122 ms
Start 756 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 130 ms
Start 756 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 130 ms
Start 756 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 137 ms
Start 757 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 139 ms
Start 757 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 140 ms
Start 757 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 134 ms
Start 765 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 139 ms
Start 772 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 130 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 6 KB
Load time 127 ms
Start 786 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 6 KB
Load time 123 ms
Start 792 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 120 ms
Start 795 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 117 ms
Start 798 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
102 requests over 3522ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 2.0 shttps://nature.org// https://nature.org/ — 301 — 260 B — 529 ms — http/1.1https://www.nature.org/www.nature.org/ https://www.nature.org/ — 301 — 226 B — 90 ms — h2https://www.nature.org/en-us/www.nature.org/en-us/ https://www.nature.org/en-us/ — 200 — 29.1 KiB — 22 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.1 KiB — 115 ms — h3https://www.nature.org/etc.clientlibs/tnc/clientlibs/themes/nature.min.ACSHASHfe0b879fa817e033b28d542fb7692d6f.csswww.nature.org/etc.clientlibs/tnc/c... https://www.nature.org/etc.clientlibs/tnc/clientlibs/themes/nature.min.ACSHASHfe0b879fa817e033b28d542fb7692d6f.css — 200 — 10.9 KiB — 31 ms — h2https://cloud.typography.com/7544374/6342392/css/fonts.csscloud.typography.com/7544374/634239... https://cloud.typography.com/7544374/6342392/css/fonts.css — 302 — 434 B — 18 ms — 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https://www.nature.org/geo-service — 200 — 885 B — 126 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 239 ms — h2https://www.nature.org/bin/tnc/supporterservice.pagedetails.html?pageID=79185www.nature.org/bin/tnc/supporterser... https://www.nature.org/bin/tnc/supporterservice.pagedetails.html?pageID=79185 — 200 — 831 B — 474 ms — h2https://www.nature.org/bin/tnc/supporterservice.pagedetails.htmlwww.nature.org/bin/tnc/supporterser... https://www.nature.org/bin/tnc/supporterservice.pagedetails.html — 200 — 268 B — 14 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 354 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 461 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/assets/resources/icons/close-icon-modal.svgwww.nature.org/etc.clientlibs/tnc/c... 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h2https://tags.tiqcdn.com/utag/tiqapp/utag.v.js?a=tnc/global/202604211446&cb=1776810157999tags.tiqcdn.com/utag/tiqapp/utag.v.... https://tags.tiqcdn.com/utag/tiqapp/utag.v.js?a=tnc/global/202604211446&cb=1776810157999 — 200 — 432 B — 3 ms — h2https://collect.tealiumiq.com/tnc/main/2/i.gifcollect.tealiumiq.com/tnc/main/2/i.... https://collect.tealiumiq.com/tnc/main/2/i.gif — 200 — 770 B — 74 ms — h2
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 1039ms · 1061KB · $14/mo
www.nature.org
Other
Costly
Execution 449ms
Transfer 29 KB
Monthly Cost $6/mo
Unattributable
Other
Optional
Execution 176ms
Transfer 0 KB
Monthly Cost $2/mo
www.nature.org
Other
Optional
Execution 102ms
Transfer 496 KB
Unused 74%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 75ms
Transfer 129 KB
Unused 54%
Monthly Cost $1/mo
www.nature.org
Other
Optional
Execution 66ms
Transfer 75 KB
Unused 81%
Monthly Cost $1/mo
tags.tiqcdn.com
Other
Optional
Execution 66ms
Transfer 62 KB
Unused 57%
Monthly Cost $1/mo
cdn-4.convertexperiments.com
Other
Optional
Execution 54ms
Transfer 88 KB
Unused 58%
Monthly Cost $1/mo
maps.googleapis.com
Other
Optional
Execution 51ms
Transfer 182 KB
Unused 57%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nature.org adds 449ms and costs ~$6/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.nature.org takes 449ms 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

74% of www.nature.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

54% 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

81% of www.nature.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

57% of tags.tiqcdn.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

58% of cdn-4.convertexperiments.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

57% of maps.googleapis.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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