Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3022ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://app.mongabay.com/_next/static/chunks/32b4d63e10d31351.js | 1511ms | 1358ms | 19ms | 3rd |
| https://app.mongabay.com/ | 676ms | 18ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG | 440ms | 296ms | 140ms | 3rd |
| Unattributable | 395ms | 20ms | 0ms | 3rd |
BPage Weight Budget1.1 MB transferred, 51 requestsREVIEW
BJS Bundles21 scripts, 88 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-MYFV07YNRG | 156 KB | 64 KB (41%) | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/04ddbc0f56dd5560.js | 49 KB | 24 KB (49%) | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/4aa5988cda435440.js | 11 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/e788524e70a7e84e.js | 8 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/be3cabbd34115f69.js | 17 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/3f7bef77052a0338.js | 13 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/turbopack-ca3c455e51bc1fe5.js | 4 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/ff1a16fafef87110.js | 1 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/d996c681730d5fed.js | 7 KB | — | ✓ | 3rd |
| https://app.mongabay.com/_next/static/chunks/175c00d4e8dad240.js | 4 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BPage Weight Inventory51 resources · 1.1 MB · 88 KB savings availableREVIEW
~87.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 51 resources | 1.1 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization14 images, 0 KB saveablePASS
A+Font Loading2 fonts (47 KB)PASS
Web fonts
2
47 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints6 hints, 0 missing preconnectsPASS
Current Resource Hints
6 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=600 (10 minutes)PASS
max-age=600, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| max-age | 600 | Cache for 10 minutes |
| must-revalidate | — | Must recheck with server after expiry |
Network Waterfall51 requests over 3281msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
app.mongabay.com app.mongabay.com | Other | 1511ms | 52 KB | — | $20/mo | Costly |
app.mongabay.com app.mongabay.com | Other | 676ms | 11 KB | — | $9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 440ms | 156 KB | 41% | $6/mo | Costly |
Unattributable Unattributable | Other | 395ms | 0 KB | — | $5/mo | Costly |
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.
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.
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.
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.
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.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev