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https://mongabay.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

2.91 s

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

7.25 s

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

788 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.

3.28 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.

8.59 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
9 PASS 4 REVIEW 2 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3022ms total JS execution
FIX
3022ms total JS execution
Warning::
https://app.mongabay.com/_next/static/chunks/32b4d...: 1511ms CPU time
Warning::
https://app.mongabay.com/: 676ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MYFV...: 440ms CPU time
Warning::
Unattributable: 395ms CPU time
Warning::
Third-party scripts: 3022ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 22% Style & Layout 11% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.js1511ms1358ms19ms3rd
https://app.mongabay.com/676ms18ms7ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG440ms296ms140ms3rd
Unattributable395ms20ms0ms3rd
B
Page Weight Budget
1.1 MB transferred, 51 requests
REVIEW
1.1 MB transferred, 51 requests
Info::
Page weighs 2.3 MB (1.1 MB transferred)
Info::
51 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
51 requests
0.24 g CO2 per page load
Images 579.0 KiB 50%
JavaScript 456.5 KiB 40%
Fonts 46.8 KiB 4%
Other 31.3 KiB 3%
Other 16.0 KiB 1%
HTML 10.8 KiB 1%
CSS 6.9 KiB 1%
Other 559 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
B
JS Bundles
21 scripts, 88 KB unused
REVIEW
21 scripts, 88 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MYFV...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.mongabay.com/_next/static/chunks/04ddb...: 24 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 88 KB
88 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG156 KB64 KB (41%)✓3rd
https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.js49 KB24 KB (49%)✓3rd
https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.js11 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.js8 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.js17 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.js13 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.js4 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.js1 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.js7 KB—✓3rd
https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.js4 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

B
Page Weight Inventory
51 resources · 1.1 MB · 88 KB savings available
REVIEW
51 resources · 1.1 MB · 88 KB savings available
Warning::
Page weight 124 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~88 KB of savings available
Warning::
50 third-party resources (100% of weight)
51 resources · 1.1 MiB · 50 third-party 123.8 KiB over 1MB target
Image 52% · 594.3 KiB
JavaScript 40% · 456.5 KiB
Font 4% · 46.8 KiB
Other 3% · 32.0 KiB
Document 1% · 11.4 KiB
CSS 1% · 6.9 KiB

~87.6 KiB of savings available

Remove unused JavaScript: 87.6 KiB
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
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 579 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (47 KB)
PASS
2 fonts (47 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

47 KB total

Render-blocking

0

of 2

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 2.9 s LCP 7.3 shttps://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2Rowan_Medium-s.p.17290a... https://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2 — 20.4 KiB — 41 ms — font-display: swaphttps://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2fa0520225c6f3d07-s.p.d2... https://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2 — 26.3 KiB — 40 ms — font-display: swap
Rowan_Medium-s.p.17290a... woff2 swap
Size 20 KB
Load time 41 ms
Start 194 ms
Risk FOUT — text flashes from fallback to web font
fa0520225c6f3d07-s.p.d2... woff2 swap
Size 26 KB
Load time 40 ms
Start 195 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
3
prefetch
—

6 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
A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600, must-revalidate
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600, must-revalidate

DirectiveValueMeaning
max-age600Cache for 10 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 600 seconds
Network Waterfall
51 requests over 3281ms
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 2.9 s LCP 7.3 shttps://mongabay.com// https://mongabay.com/ — 301 — 553 B — 80 ms — h2https://news.mongabay.com/news.mongabay.com/ https://news.mongabay.com/ — 302 — 153 B — 35 ms — h2https://app.mongabay.com/app.mongabay.com/ https://app.mongabay.com/ — 200 — 10.8 KiB — 52 ms — h3https://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2app.mongabay.com/_next/static/media... https://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2 — 200 — 20.4 KiB — 41 ms — h3https://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2app.mongabay.com/_next/static/media... https://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2 — 200 — 26.3 KiB — 40 ms — h3https://app.mongabay.com/_next/static/chunks/cd28f6e0c537cd32.cssapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/cd28f6e0c537cd32.css — 200 — 6.9 KiB — 20 ms — h3https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG — 200 — 156.3 KiB — 148 ms — h2https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.js — 200 — 8.2 KiB — 35 ms — h3https://app.mongabay.com/_next/static/chunks/363a944da3ad2b7c.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/363a944da3ad2b7c.js — 200 — 9.5 KiB — 59 ms — h3https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.js — 200 — 52.3 KiB — 120 ms — h3https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.js — 200 — 16.6 KiB — 100 ms — h3https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.js — 200 — 13.0 KiB — 110 ms — h3https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.js — 200 — 4.0 KiB — 101 ms — h3https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.js — 200 — 589 B — 89 ms — h3https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.js — 200 — 7.3 KiB — 104 ms — h3https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.js — 200 — 3.6 KiB — 86 ms — h3https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.js — 200 — 10.8 KiB — 108 ms — h3https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.js — 200 — 49.1 KiB — 116 ms — h3https://app.mongabay.com/_next/static/chunks/95c358c5320979e4.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/95c358c5320979e4.js — 200 — 23.5 KiB — 113 ms — h3https://app.mongabay.com/_next/static/chunks/ca1e6892210859cc.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/ca1e6892210859cc.js — 200 — 10.8 KiB — 114 ms — h3https://app.mongabay.com/_next/static/chunks/bf4e7d3d5bec05a4.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/bf4e7d3d5bec05a4.js — 200 — 2.5 KiB — 113 ms — h3https://app.mongabay.com/_next/static/chunks/cd16300615ccab12.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/cd16300615ccab12.js — 200 — 10.9 KiB — 115 ms — h3https://app.mongabay.com/_next/static/chunks/c309573d46c6cdd6.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/c309573d46c6cdd6.js — 200 — 13.2 KiB — 115 ms — h3https://app.mongabay.com/_next/static/chunks/c00a6bec96f028b3.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/c00a6bec96f028b3.js — 200 — 13.6 KiB — 120 ms — h3https://app.mongabay.com/_next/static/chunks/f8380aca77880ccb.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/f8380aca77880ccb.js — 200 — 36.7 KiB — 120 ms — h3https://app.mongabay.com/favicon.ico?favicon.4880b068.icoapp.mongabay.com/favicon.ico?favico... https://app.mongabay.com/favicon.ico?favicon.4880b068.ico — 200 — 15.3 KiB — 163 ms — h3https://news.mongabay.com/graphqlnews.mongabay.com/graphql https://news.mongabay.com/graphql — 200 — 0 B — 240 ms — h2https://news.mongabay.com/graphqlnews.mongabay.com/graphql https://news.mongabay.com/graphql — 200 — 0 B — 306 ms — h2https://analytics.google.com/g/collect?v=2&tid=G-MYFV07YNRG&gtm=45je64h1v9241288530za200zd9241288530&_p=1776813029088&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1948254794.1776813029&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en&gaf=2&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fapp.mongabay.com%2F&dp=%2F&dr=&dt=Conservation%20and%20environmental%20science%20news%20-%20Mongabay&sid=1776813029&sct=1&seg=0&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=721analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-MYFV07YNRG&gtm=45je64h1v9241288530za200zd9241288530&_p=1776813029088&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1948254794.1776813029&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en&gaf=2&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fapp.mongabay.com%2F&dp=%2F&dr=&dt=Conservation%20and%20environmental%20science%20news%20-%20Mongabay&sid=1776813029&sct=1&seg=0&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=721 — 204 — 550 B — 56 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-MYFV07YNRG&cid=1948254794.1776813029&gtm=45je64h1v9241288530za200zd9241288530&rcb=12&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-MYFV07YNRG&cid=1948254794.1776813029&gtm=45je64h1v9241288530za200zd9241288530&rcb=12&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400 — 204 — 559 B — 66 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.9 s LCP 7.3 shttps://mongabay.com// https://mongabay.com/ — 301 — 553 B — 80 ms — h2https://news.mongabay.com/news.mongabay.com/ https://news.mongabay.com/ — 302 — 153 B — 35 ms — h2https://app.mongabay.com/app.mongabay.com/ https://app.mongabay.com/ — 200 — 10.8 KiB — 52 ms — h3https://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2app.mongabay.com/_next/static/media... https://app.mongabay.com/_next/static/media/Rowan_Medium-s.p.17290a98.woff2 — 200 — 20.4 KiB — 41 ms — h3https://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2app.mongabay.com/_next/static/media... https://app.mongabay.com/_next/static/media/fa0520225c6f3d07-s.p.d28ba1c8.woff2 — 200 — 26.3 KiB — 40 ms — h3https://app.mongabay.com/_next/static/chunks/cd28f6e0c537cd32.cssapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/cd28f6e0c537cd32.css — 200 — 6.9 KiB — 20 ms — h3https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG — 200 — 156.3 KiB — 148 ms — h2https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.js — 200 — 8.2 KiB — 35 ms — h3https://app.mongabay.com/_next/static/chunks/363a944da3ad2b7c.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/363a944da3ad2b7c.js — 200 — 9.5 KiB — 59 ms — h3https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.js — 200 — 52.3 KiB — 120 ms — h3https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.js — 200 — 16.6 KiB — 100 ms — h3https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.js — 200 — 13.0 KiB — 110 ms — h3https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.js — 200 — 4.0 KiB — 101 ms — h3https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.js — 200 — 589 B — 89 ms — h3https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.js — 200 — 7.3 KiB — 104 ms — h3https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.js — 200 — 3.6 KiB — 86 ms — h3https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.js — 200 — 10.8 KiB — 108 ms — h3https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.js — 200 — 49.1 KiB — 116 ms — h3https://app.mongabay.com/_next/static/chunks/95c358c5320979e4.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/95c358c5320979e4.js — 200 — 23.5 KiB — 113 ms — h3https://app.mongabay.com/_next/static/chunks/ca1e6892210859cc.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/ca1e6892210859cc.js — 200 — 10.8 KiB — 114 ms — h3https://app.mongabay.com/_next/static/chunks/bf4e7d3d5bec05a4.jsapp.mongabay.com/_next/static/chunk... https://app.mongabay.com/_next/static/chunks/bf4e7d3d5bec05a4.js — 200 — 2.5 KiB — 113 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3022ms · 219KB · $40/mo
app.mongabay.com
Other
Costly
Execution 1511ms
Transfer 52 KB
Monthly Cost $20/mo
app.mongabay.com
Other
Costly
Execution 676ms
Transfer 11 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 440ms
Transfer 156 KB
Unused 41%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 395ms
Transfer 0 KB
Monthly Cost $5/mo

These scripts may cost more than they're worth

  • app.mongabay.com adds 1511ms and costs ~$20/month
  • app.mongabay.com adds 676ms and costs ~$9/month
  • Google Tag Manager adds 440ms and costs ~$6/month
  • Unattributable adds 395ms and costs ~$5/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

app.mongabay.com takes 1511ms 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

app.mongabay.com takes 676ms 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

Google Tag Manager takes 440ms 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 395ms 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

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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