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https://nature.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
50
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.

4.84 s

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

7.59 s

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

412 ms

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

0.067

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

6.56 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.

14.09 s

Page Load Progression

448 ms
896 ms
1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.6 s
Checks
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 81 requests
FIX
2.4 MB transferred, 81 requests
Info::
Page weighs 6.4 MB (2.4 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
CSS is 350 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 350 KB
Info::
81 HTTP requests
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
81 requests
0.50 g CO2 per page load
JavaScript 1.1 MiB 44%
Images 833.3 KiB 34%
CSS 350.4 KiB 14%
Fonts 133.6 KiB 5%
HTML 30.0 KiB 1%
Other 14.3 KiB 1%
Other 8.4 KiB 0%
Other 1.3 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

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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3261ms total JS execution
FIX
3261ms total JS execution
Warning::
https://www.nature.org/en-us/: 1382ms CPU time
Warning::
Unattributable: 425ms CPU time
Warning::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 417ms CPU time
Info::
https://www.nature.org/etc.clientlibs/tnc/clientli...: 249ms CPU time
Info::
https://cdn-4.convertexperiments.com/v1/js/1003489...: 215ms CPU time
Warning::
Third-party scripts: 3261ms (100% of total)

Main Thread Breakdown

Script Evaluation 31% Other 28% Style & Layout 19% Script Parsing & Compilation 10% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.nature.org/en-us/1382ms14ms3ms3rd
Unattributable425ms6ms0ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/vendor.min.ACSHASH7b99867e75cafc3d75f73d0a7af662a8.js417ms237ms178ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/templates/homepage.min.ACSHASH7c6fd9bbe9f1e3dbbeb808ae133b1fc2.js249ms153ms25ms3rd
https://cdn-4.convertexperiments.com/v1/js/10034899-10032903.js?environment=production215ms168ms26ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/granite/jquery.min.ACSHASHbfdb13a2e88f52d5d58b8d2e9e48ef48.js183ms135ms10ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyAnYGyE3Th7oLcfOVj033hp99iFdlmwMxc&libraries=geometry,visualization,places171ms109ms46ms3rd
https://tags.tiqcdn.com/utag/tnc/global/prod/utag.js135ms93ms36ms3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/granite/csrf.min.ACSHASH62044ae05bdebf846af0e91ed3a40252.js85ms75ms1ms3rd
F
JS Bundles
Action
22 scripts, 685 KB unused
FIX
22 scripts, 685 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://www.nature.org/etc.clientlibs/tnc/clientli...: 60 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/gh/ableplayer/ableplayer@...: 58 KB unused (86%)
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: 685 KB
685 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://www.nature.org/etc.clientlibs/tnc/clientlibs/templates/homepage.min.ACSHASH7c6fd9bbe9f1e3dbbeb808ae133b1fc2.js75 KB60 KB (81%)✓3rd
https://cdn.jsdelivr.net/gh/ableplayer/ableplayer@4.7/build/ableplayer.min.js68 KB58 KB (86%)✓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 KB47 KB (76%)✓3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/granite/utils.min.ACSHASH3b86602c4e1e0b41d9673f674a75cd4b.js4 KB—✓3rd
https://aaf1a18515da0e792f78-c27fdabe952dfc357fe25ebf5c8897ee.ssl.cf5.rackcdn.com/2246/en-attribution-session.js8 KB—✗3rd
https://cdn.jsdelivr.net/npm/js-cookie@3.0.1/dist/js.cookie.min.js1 KB—✓3rd
https://www.nature.org/etc.clientlibs/tnc/clientlibs/granite/csrf.min.ACSHASH62044ae05bdebf846af0e91ed3a40252.js2 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
81 resources · 2.4 MB · 685 KB savings available
FIX
81 resources · 2.4 MB · 685 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~685 KB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
3 resources over 200KB
81 resources · 2.4 MiB · 80 third-party 1.4 MiB over 1MB target
JavaScript 44% · 1.1 MiB
Image 35% · 846.7 KiB
CSS 14% · 350.4 KiB
Font 5% · 133.6 KiB
Document 1% · 32.0 KiB
Other 0% · 8.7 KiB

~685.0 KiB of savings available

Remove unused JavaScript: 685.0 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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
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::
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/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 833 KB
0 oversized -0 KB
14 legacy format
6 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

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

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
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.8 s LCP 7.6 sdata:application/x-font-woff2;base64,d09GMk9UVE8AADOQAA0AAAAAazAAADM+AAIztgAAAAAAAAAAAAAAAAAAAAAAAA…x-font-woff2;base64,d09... data:application/x-font-woff2;base64,d09GMk9UVE8AADOQAA0AAAAAazAAADM+AAIztgAAAAAAAAAAAAAAAAAAAAAAAA… — 12.9 KiB — 371 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 — 371 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 — 372 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 — 373 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 — 374 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 — 374 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 — 374 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 — 371 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 — 368 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 — 366 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 — 364 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 — 362 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 — 359 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 — 335 ms — font-display: swap
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 371 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 371 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 372 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 373 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 374 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 15 KB
Load time 374 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 13 KB
Load time 374 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 371 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 6 KB
Load time 368 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 6 KB
Load time 366 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 364 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 362 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 359 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
x-font-woff2;base64,d09... woff2 swap
Size 5 KB
Load time 335 ms
Start 1.8 s
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

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
Network Waterfall
81 requests over 3299ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.8 s LCP 7.6 shttps://nature.org// https://nature.org/ — 301 — 260 B — 521 ms — http/1.1https://www.nature.org/www.nature.org/ https://www.nature.org/ — 301 — 226 B — 82 ms — h2https://www.nature.org/en-us/www.nature.org/en-us/ https://www.nature.org/en-us/ — 200 — 29.2 KiB — 296 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 — 55 ms — h2https://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 — 63 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 — 76 ms — http/1.1https://cdn.jsdelivr.net/gh/ableplayer/ableplayer@4.7/build/ableplayer.min.csscdn.jsdelivr.net/gh/ableplayer/able... https://cdn.jsdelivr.net/gh/ableplayer/ableplayer@4.7/build/ableplayer.min.css — 200 — 5.1 KiB — 37 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/vendor.min.ACSHASH47666c84d59074f590eb720de64a850f.csswww.nature.org/etc.clientlibs/tnc/c... https://www.nature.org/etc.clientlibs/tnc/clientlibs/vendor.min.ACSHASH47666c84d59074f590eb720de64a850f.css — 200 — 20.9 KiB — 108 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/common.min.ACSHASH1971c1dbcc132904499cf7e90e4df077.csswww.nature.org/etc.clientlibs/tnc/c... https://www.nature.org/etc.clientlibs/tnc/clientlibs/common.min.ACSHASH1971c1dbcc132904499cf7e90e4df077.css — 200 — 14.6 KiB — 84 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/templates/homepage.min.ACSHASH794cc6599f859a8ba8cfceb9eae567bb.csswww.nature.org/etc.clientlibs/tnc/c... 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https://cdn-4.convertexperiments.com/api/v1/project-optional-settings/10034899/10032903 — 200 — 531 B — 12 ms — h2https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;700&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;700&display=swap — 200 — 2.1 KiB — 96 ms — h2https://www.nature.org/libs/granite/csrf/token.jsonwww.nature.org/libs/granite/csrf/to... https://www.nature.org/libs/granite/csrf/token.json — 200 — 558 B — 763 ms — h2https://www.nature.org/bin/tnc/donationplatformurlswww.nature.org/bin/tnc/donationplat... https://www.nature.org/bin/tnc/donationplatformurls — 200 — 741 B — 166 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.2 KiB — 89 ms — h2https://player.vimeo.com/api/player.jsplayer.vimeo.com/api/player.js https://player.vimeo.com/api/player.js — 200 — 9.0 KiB — 109 ms — http/1.1https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 327 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 477 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 — 303 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 — 94 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 637 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 745 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/assets/resources/icons/close-icon-modal.svgwww.nature.org/etc.clientlibs/tnc/c... https://www.nature.org/etc.clientlibs/tnc/clientlibs/assets/resources/icons/close-icon-modal.svg — 200 — 680 B — 69 ms — h2https://www.nature.org/etc.clientlibs/tnc/clientlibs/assets/resources/icons/icon-glob.svgwww.nature.org/etc.clientlibs/tnc/c... https://www.nature.org/etc.clientlibs/tnc/clientlibs/assets/resources/icons/icon-glob.svg — 200 — 1.8 KiB — 90 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 888 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 1.0 s — h2https://www.nature.org/bin/tnc/supporterservice.pagedetails.htmlwww.nature.org/bin/tnc/supporterser... https://www.nature.org/bin/tnc/supporterservice.pagedetails.html — 200 — 0 B — 57 ms — h2https://www.nature.org/geo-servicewww.nature.org/geo-service https://www.nature.org/geo-service — 200 — 885 B — 1.1 s — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 63 ms — h2https://www.youtube.com/s/player/218d9d92/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/218d9d92/w... https://www.youtube.com/s/player/218d9d92/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 28 ms — h2https://cdn.cookielaw.org/consent/6a70ed51-2022-4dca-b92f-25a0f9538a4b/6a70ed51-2022-4dca-b92f-25a0f9538a4b.jsoncdn.cookielaw.org/consent/6a70ed51-... https://cdn.cookielaw.org/consent/6a70ed51-2022-4dca-b92f-25a0f9538a4b/6a70ed51-2022-4dca-b92f-25a0f9538a4b.json — -1 — 0 B — 63 ms — https://www.nature.org/en-us/cdc/www.nature.org/en-us/cdc/ https://www.nature.org/en-us/cdc/ — 200 — 841 B — 76 ms — h2https://www.nature.org/content/dam/tnc/nature/en/icons/general-icons/tnc-standard-favicon.pngwww.nature.org/content/dam/tnc/natu... 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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 — 0 B — 0 ms — h2https://aaf1a18515da0e792f78-c27fdabe952dfc357fe25ebf5c8897ee.ssl.cf5.rackcdn.com/2246/tnc-cross-domain-cookie-storage.jsaaf1a18515da0e792f78-c27fdabe952dfc... https://aaf1a18515da0e792f78-c27fdabe952dfc357fe25ebf5c8897ee.ssl.cf5.rackcdn.com/2246/tnc-cross-domain-cookie-storage.js — 200 — 0 B — 0 ms — http/1.1
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 3261ms · 967KB · $43/mo
www.nature.org
Other
Costly
Execution 1382ms
Transfer 29 KB
Monthly Cost $18/mo
Unattributable
Other
Costly
Execution 425ms
Transfer 0 KB
Monthly Cost $6/mo
www.nature.org
Other
Costly
Execution 417ms
Transfer 496 KB
Unused 74%
Monthly Cost $6/mo
www.nature.org
Other
Costly
Execution 249ms
Transfer 75 KB
Unused 81%
Monthly Cost $3/mo
cdn-4.convertexperiments.com
Other
Costly
Execution 215ms
Transfer 88 KB
Unused 58%
Monthly Cost $3/mo
www.nature.org
Other
Optional
Execution 183ms
Transfer 33 KB
Monthly Cost $2/mo
maps.googleapis.com
Other
Optional
Execution 171ms
Transfer 182 KB
Unused 57%
Monthly Cost $2/mo
tags.tiqcdn.com
Other
Optional
Execution 135ms
Transfer 62 KB
Unused 76%
Monthly Cost $2/mo
www.nature.org
Other
Optional
Execution 85ms
Transfer 2 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nature.org adds 1382ms and costs ~$18/month
  • Unattributable adds 425ms and costs ~$6/month
  • www.nature.org adds 417ms and costs ~$6/month
  • www.nature.org adds 249ms and costs ~$3/month
  • cdn-4.convertexperiments.com adds 215ms 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.nature.org takes 1382ms 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 425ms 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.nature.org takes 417ms 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

www.nature.org takes 249ms 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

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

cdn-4.convertexperiments.com takes 215ms 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

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

76% 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

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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