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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

915 ms

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

1.25 s

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

238 ms

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

0.263

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

1.52 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.

4.06 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
5.4 MB transferred, 90 requests
FIX
5.4 MB transferred, 90 requests
Critical::
Page weighs 10.3 MB (5.4 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
Fonts are 342 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 342 KB
Info::
90 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
90 requests
1.1 g CO2 per page load
Images 2.6 MiB 49%
JavaScript 2.4 MiB 44%
Fonts 341.7 KiB 6%
CSS 40.3 KiB 1%
HTML 11.8 KiB 0%
Other 3.6 KiB 0%
Other 2.0 KiB 0%
Other 620 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
13 scripts, 1.0 MB unused
FIX
13 scripts, 1.0 MB unused
Warning::
https://nrl.iucnredlist.org/packs/redlist-91968a82...: 638 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-114...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-114...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6HJE...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T3K1...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1049 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nrl.iucnredlist.org/packs/redlist-91968a82c64c481f2989.js1445 KB638 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-11409245-6&cx=c&gtm=4e64h1125 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-11409245-5&cx=c&gtm=4e64h1125 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-6HJED7KZLB&cx=c&gtm=4e64h1146 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-T3K17G40FC&cx=c&gtm=4e64h1146 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-66YGJWTDLZ&cx=c&gtm=4e64h1146 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-11409245-4125 KB63 KB (51%)✓3rd
https://nrl.iucnredlist.org/assets/application-38c0ffd83a61759780bd4ed4d32e23b4c07893f0974378780be39259de4ad5ac.js138 KB24 KB (18%)✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.iucnredlist.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 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
90 resources · 5.4 MB · 1.0 MB savings available
FIX
90 resources · 5.4 MB · 1.0 MB savings available
Warning::
Page weight 4.4 MB over 1MB target
Got: 5.4 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
89 third-party resources (100% of weight)
Info::
7 resources over 200KB
90 resources · 5.4 MiB · 89 third-party 4.4 MiB over 1MB target
Image 49% · 2.6 MiB
JavaScript 44% · 2.4 MiB
Font 6% · 341.7 KiB
CSS 1% · 40.3 KiB
Document 0% · 12.3 KiB
Other 0% · 4.8 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB
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
57 images, 0 KB saveable
REVIEW
57 images, 0 KB saveable
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/species-of-the-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/feedback-ff9e97... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/news_snippets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/amazing-species... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/news_snippets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/species-of-the-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/amazing-species... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/home/red_list_6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/news_snippets/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/home/green_turt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/brand_wordmark-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/icons/taxonomy-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nc.iucnredlist.org/redlist/partners/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://nrl.iucnredlist.org/assets/category-lg/cat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57 images 2.6 MB
0 oversized -0 KB
49 legacy format
44 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

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

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

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

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

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

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

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
1837ms total JS execution
REVIEW
1837ms total JS execution
Warning::
https://nrl.iucnredlist.org/packs/redlist-91968a82...: 566ms CPU time
Warning::
Unattributable: 297ms CPU time
Warning::
https://www.iucnredlist.org/: 269ms CPU time
Info::
https://www.iucnredlist.org/cdn-cgi/challenge-plat...: 197ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-T3K1...: 83ms CPU time
Warning::
Third-party scripts: 1837ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Script Parsing & Compilation 17% Other 16% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://nrl.iucnredlist.org/packs/redlist-91968a82c64c481f2989.js566ms372ms186ms3rd
Unattributable297ms33ms0ms3rd
https://www.iucnredlist.org/269ms15ms1ms3rd
https://www.iucnredlist.org/cdn-cgi/challenge-platform/scripts/jsd/main.js197ms177ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T3K17G40FC&cx=c&gtm=4e64h183ms67ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6HJED7KZLB&cx=c&gtm=4e64h183ms66ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-11409245-5&cx=c&gtm=4e64h171ms56ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-66YGJWTDLZ&cx=c&gtm=4e64h171ms53ms17ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-11409245-6&cx=c&gtm=4e64h168ms53ms14ms3rd
https://nrl.iucnredlist.org/assets/application-38c0ffd83a61759780bd4ed4d32e23b4c07893f0974378780be39259de4ad5ac.js67ms33ms26ms3rd

Showing top 10 of 11 scripts

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
6 fonts (342 KB)
PASS
6 fonts (342 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

342 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 915 ms LCP 1.2 shttps://nrl.iucnredlist.org/assets/Roboto-regular-47107401d0adb375ab9aa167f9d62489a849d510e740a307b5a4db60e5db3562.woff2Roboto-regular-47107401... https://nrl.iucnredlist.org/assets/Roboto-regular-47107401d0adb375ab9aa167f9d62489a849d510e740a307b5a4db60e5db3562.woff2 — 63.8 KiB — 23 ms — font-display: swaphttps://nrl.iucnredlist.org/assets/Roboto-italic-884e654cef00224110fc62cdf8f1561ff08dcaa1f359e5c5f49dab62abfe79e8.woff2Roboto-italic-884e654ce... https://nrl.iucnredlist.org/assets/Roboto-italic-884e654cef00224110fc62cdf8f1561ff08dcaa1f359e5c5f49dab62abfe79e8.woff2 — 69.1 KiB — 36 ms — font-display: swaphttps://nrl.iucnredlist.org/assets/Roboto-500-96025fe9db6578d8bc7f4b8be739750b1490e07221c2b1f16acde2ea7669cedf.woff2Roboto-500-96025fe9db65... https://nrl.iucnredlist.org/assets/Roboto-500-96025fe9db6578d8bc7f4b8be739750b1490e07221c2b1f16acde2ea7669cedf.woff2 — 64.3 KiB — 13 ms — font-display: swaphttps://nrl.iucnredlist.org/assets/Roboto-700-8e44376b735dcc9027acbcc8a0df64c3f886a23529eff27b022f344d719e90f2.woff2Roboto-700-8e44376b735d... https://nrl.iucnredlist.org/assets/Roboto-700-8e44376b735dcc9027acbcc8a0df64c3f886a23529eff27b022f344d719e90f2.woff2 — 63.7 KiB — 29 ms — font-display: swaphttps://nrl.iucnredlist.org/assets/Roboto-500italic-e14046ef7db1a19b5ee3b1f13cd76bc16945080a40060d4026ec7acf14356169.woff2Roboto-500italic-e14046... https://nrl.iucnredlist.org/assets/Roboto-500italic-e14046ef7db1a19b5ee3b1f13cd76bc16945080a40060d4026ec7acf14356169.woff2 — 11.6 KiB — 33 ms — font-display: swaphttps://nrl.iucnredlist.org/assets/Roboto-700italic-c9d5a0e6287ab6c0d3e7c80ebdeb26427680849215882e3db0061efcf64c2575.woff2Roboto-700italic-c9d5a0... https://nrl.iucnredlist.org/assets/Roboto-700italic-c9d5a0e6287ab6c0d3e7c80ebdeb26427680849215882e3db0061efcf64c2575.woff2 — 69.1 KiB — 35 ms — font-display: swap
Roboto-regular-47107401... woff2 swap
Size 64 KB
Load time 23 ms
Start 475 ms
Risk FOUT — text flashes from fallback to web font
Roboto-italic-884e654ce... woff2 swap
Size 69 KB
Load time 36 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Roboto-500-96025fe9db65... woff2 swap
Size 64 KB
Load time 13 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Roboto-700-8e44376b735d... woff2 swap
Size 64 KB
Load time 29 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Roboto-500italic-e14046... woff2 swap
Size 12 KB
Load time 33 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Roboto-700italic-c9d5a0... woff2 swap
Size 69 KB
Load time 35 ms
Start 1.3 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
90 requests over 2168ms
INFO
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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 1837ms · 2407KB · $24/mo
nrl.iucnredlist.org
Other
Costly
Execution 566ms
Transfer 1445 KB
Unused 46%
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 297ms
Transfer 0 KB
Monthly Cost $4/mo
www.iucnredlist.org
Other
Costly
Execution 269ms
Transfer 12 KB
Monthly Cost $4/mo
www.iucnredlist.org
Other
Optional
Execution 197ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 146 KB
Unused 44%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 146 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 125 KB
Unused 52%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 146 KB
Unused 44%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 125 KB
Unused 52%
Monthly Cost $1/mo
nrl.iucnredlist.org
Other
Optional
Execution 67ms
Transfer 138 KB
Unused 18%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 125 KB
Unused 51%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • nrl.iucnredlist.org adds 566ms and costs ~$8/month
  • Unattributable adds 297ms and costs ~$4/month
  • www.iucnredlist.org adds 269ms and costs ~$4/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

nrl.iucnredlist.org takes 566ms 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 297ms 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.iucnredlist.org takes 269ms 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

52% of Google Tag Manager'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

52% of Google Tag Manager'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

51% of Google Tag Manager'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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