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https://earthsky.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

6.17 s

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

24.40 s

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

787 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.

7.82 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.

25.20 s

Page Load Progression

383 ms
765 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
17
9 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 133 requests
FIX
5.0 MB transferred, 133 requests
Critical::
Page weighs 10.2 MB (5.0 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
133 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
133 requests
1.0 g CO2 per page load
Images 2.9 MiB 59%
JavaScript 1.6 MiB 32%
Fonts 169.2 KiB 3%
CSS 158.1 KiB 3%
Other 35.0 KiB 1%
HTML 33.9 KiB 1%
Other 25.0 KiB 0%
Other 23.7 KiB 0%
Other 0 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

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

F
JS Execution Cost
Action
5605ms total JS execution
FIX
5605ms total JS execution
Warning::
Unattributable: 1076ms CPU time
Warning::
https://earthsky.org/wp-content/themes/earthsky-te...: 835ms CPU time
Warning::
https://earthsky.org/: 787ms CPU time
Warning::
https://cdn.consentmanager.net/delivery/customdata...: 405ms CPU time
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 378ms CPU time
Warning::
Third-party scripts: 3520ms (63% of total)

Main Thread Breakdown

Script Evaluation 56% Other 20% Style & Layout 10% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
Unattributable1076ms272ms0ms3rd
https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/js/webflow.js?v=1620812547627835ms260ms85ms1st
https://earthsky.org/787ms373ms14ms1st
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF81MzQ3MS54XzExNC52LnAudF81MzQ3MS54dF8xNTA.js405ms383ms6ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008378ms257ms42ms3rd
https://ads.adthrive.com/builds/core/4dd4419/es2018/js/adthrive.min.js?deployment=2026-04-22-09:rpsc-837:4dd4419:4&bucket=flex-21&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5d668609cc7cae09064f6362303ms161ms120ms3rd
https://ads.adthrive.com/sites/5d668609cc7cae09064f6362/ads.min.js?referrer=https%3A%2F%2Fearthsky.org%2F&cb=34288ms254ms9ms3rd
https://earthsky.org/cdn-cgi/challenge-platform/scripts/jsd/main.js238ms228ms4ms1st
https://ads.adthrive.com/builds/core/4dd4419/gdpr/vendor/prebid/es2018/prebid.min.js229ms185ms34ms3rd
https://earthsky.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1225ms135ms10ms1st

Showing top 10 of 18 scripts

F
JS Bundles
Action
33 scripts, 657 KB unused
FIX
33 scripts, 657 KB unused
Warning::
https://ads.adthrive.com/builds/core/4dd4419/es201...: 161 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 131 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/4dd4419/gdpr/...: 114 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5TNL...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-412...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 657 KB
657 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/4dd4419/es2018/js/adthrive.min.js?deployment=2026-04-22-09:rpsc-837:4dd4419:4&bucket=flex-21&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5d668609cc7cae09064f6362370 KB161 KB (44%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008188 KB131 KB (70%)✓3rd
https://ads.adthrive.com/builds/core/4dd4419/gdpr/vendor/prebid/es2018/prebid.min.js159 KB114 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5TNL0C8RD8&cx=c&gtm=4e64k0176 KB67 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-412478-1125 KB62 KB (49%)✓3rd
https://c.aps.amazon-adsystem.com/apstag.js89 KB57 KB (64%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js101 KB37 KB (36%)✓3rd
https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/js/webflow.js?v=1620812547627117 KB27 KB (23%)✗1st
https://earthsky.org/wp-content/plugins/advanced-ads-pro/assets/js/postscribe.js?ver=3.0.813 KB—✗1st
https://www.google-analytics.com/analytics.js21 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

D
Page Weight Inventory
Action
133 resources · 5.0 MB · 657 KB savings available
FIX
133 resources · 5.0 MB · 657 KB savings available
Warning::
Page weight 4.0 MB over 1MB target
Got: 5.0 MB Expected: ≤ 1 MB
Info::
~657 KB of savings available
Info::
73 third-party resources (35% of weight)
Info::
4 resources over 200KB
133 resources · 5.0 MiB · 73 third-party 4.0 MiB over 1MB target
Image 59% · 2.9 MiB
JavaScript 32% · 1.6 MiB
Font 3% · 169.2 KiB
CSS 3% · 158.1 KiB
Other 2% · 78.1 KiB
Document 1% · 33.9 KiB

~656.5 KiB of savings available

Remove unused JavaScript: 656.5 KiB
C
Image Optimization
Action
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://earthsky.org/wp-content/themes/earthsky-te... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 2.9 MB
0 oversized -0 KB
37 legacy format
10 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

B
HTTP Caching
public, s-maxage=31536000, max-age=0, must-revalidate
REVIEW
public, s-maxage=31536000, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, s-maxage=31536000, max-age=0, must-revalidate
Info::
CDN TTL: 52 weeks (s-maxage=31536000)
Info::
Last-Modified header present
Cache-Control

public, s-maxage=31536000, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
s-maxage31536000CDN caches for 52 weeks
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A
Third-Party Impact
35% third-party, 0 ms blocking
PASS
35% third-party, 0 ms blocking
Info::
Third-party code accounts for 35% of page weight (1.8 MiB of 5.0 MiB)
Info::
Third-party blocking time is low (0 ms)
65%
35%
First-party Third-party
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 (169 KB)
PASS
6 fonts (169 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

169 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 6.2 s LCP 24.4 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 63 ms — font-display: swaphttps://fonts.gstatic.com/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9RM3p2MO32OA.woff2nKKQ-GM_FYFRJvXzVXaAPe9... https://fonts.gstatic.com/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9RM3p2MO32OA.woff2 — 24.5 KiB — 58 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2memtYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2 — 44.0 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9hMXBxEu-8JKJiwNdTve7W4-fhxjn5P_4rrgJoi8PfTdpQKp8.119.woff2nKKQ-GM_FYFRJvXzVXaAPe9... https://fonts.gstatic.com/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9hMXBxEu-8JKJiwNdTve7W4-fhxjn5P_4rrgJoi8PfTdpQKp8.119.woff2 — 33.6 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/aldrich/v22/MCoTzAn-1s3IGyJMVacY37H6D_A.woff2MCoTzAn-1s3IGyJMVacY37H... https://fonts.gstatic.com/s/aldrich/v22/MCoTzAn-1s3IGyJMVacY37H6D_A.woff2 — 7.9 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVJz9d.woff21Ptxg8zYS_SKggPN4iEgvnH... https://fonts.gstatic.com/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVJz9d.woff2 — 17.1 KiB — 31 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 63 ms
Start 399 ms
Risk FOUT — text flashes from fallback to web font
nKKQ-GM_FYFRJvXzVXaAPe9... woff2 swap
Size 25 KB
Load time 58 ms
Start 400 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 42 ms
Start 452 ms
Risk FOUT — text flashes from fallback to web font
nKKQ-GM_FYFRJvXzVXaAPe9... woff2 swap
Size 34 KB
Load time 41 ms
Start 453 ms
Risk FOUT — text flashes from fallback to web font
MCoTzAn-1s3IGyJMVacY37H... woff2 swap
Size 8 KB
Load time 31 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
1Ptxg8zYS_SKggPN4iEgvnH... woff2 swap
Size 17 KB
Load time 31 ms
Start 1.5 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
1
prefetch
—

3 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+
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
133 requests over 2845ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 6.2 s LCP 24.4 shttps://earthsky.org// https://earthsky.org/ — 200 — 26.5 KiB — 77 ms — h2https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/normalize.css?v=1620812547627/wp-content/themes/earthsky-testing... https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/normalize.css?v=1620812547627 — 200 — 2.8 KiB — 31 ms — h2https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/webflow.css?v=1620812547627/wp-content/themes/earthsky-testing... https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/webflow.css?v=1620812547627 — 200 — 9.2 KiB — 32 ms — h2https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/earthsky-testing-6c8e0a978c578089f4b8b6.webflow.css?v=1620812547627/wp-content/themes/earthsky-testing... https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/css/earthsky-testing-6c8e0a978c578089f4b8b6.webflow.css?v=1620812547627 — 200 — 12.0 KiB — 39 ms — h2https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.jsajax.googleapis.com/ajax/libs/webfo... https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js — 200 — 5.9 KiB — 137 ms — h2https://earthsky.org/wp-content/plugins/novashare/css/style.min.css?ver=1.6.4/wp-content/plugins/novashare/css/s... https://earthsky.org/wp-content/plugins/novashare/css/style.min.css?ver=1.6.4 — 200 — 2.0 KiB — 34 ms — h2https://earthsky.org/wp-content/plugins/udesly-adapter-plugin/assets/css/ajax-loading.css?ver=2.0.25/wp-content/plugins/udesly-adapter-... https://earthsky.org/wp-content/plugins/udesly-adapter-plugin/assets/css/ajax-loading.css?ver=2.0.25 — 200 — 746 B — 41 ms — 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h2https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 42 ms — h3https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/images/favicon.png?v=1620812547627/wp-content/themes/earthsky-testing... https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/images/favicon.png?v=1620812547627 — 200 — 1.4 KiB — 26 ms — h2https://earthsky.org/upl/2018/04/popupbg2.png/upl/2018/04/popupbg2.png https://earthsky.org/upl/2018/04/popupbg2.png — 200 — 32.0 KiB — 27 ms — h2https://fonts.gstatic.com/s/aldrich/v22/MCoTzAn-1s3IGyJMVacY37H6D_A.woff2fonts.gstatic.com/s/aldrich/v22/MCo... https://fonts.gstatic.com/s/aldrich/v22/MCoTzAn-1s3IGyJMVacY37H6D_A.woff2 — 200 — 7.9 KiB — 31 ms — h3https://fonts.gstatic.com/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVJz9d.woff2fonts.gstatic.com/s/raleway/v37/1Pt... https://fonts.gstatic.com/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVJz9d.woff2 — 200 — 17.1 KiB — 31 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k0v9103337068za20g&_p=1776896460073&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AgAIAGA&are=1&cid=358214152.1776896461&frm=0&pscdl=denied&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616985~115938465~115938468~117266400~117512543&sid=1776896460&sct=1&seg=0&dl=https%3A%2F%2Fearthsky.org%2F&dt=EarthSky%20%7C%20Updates%20on%20your%20cosmos%20and%20world&en=page_view&_fv=1&_nsi=1&_ss=1&gap.plf=5&tfd=1585region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k0v9103337068za20g&_p=1776896460073&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AgAIAGA&are=1&cid=358214152.1776896461&frm=0&pscdl=denied&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616985~115938465~115938468~117266400~117512543&sid=1776896460&sct=1&seg=0&dl=https%3A%2F%2Fearthsky.org%2F&dt=EarthSky%20%7C%20Updates%20on%20your%20cosmos%20and%20world&en=page_view&_fv=1&_nsi=1&_ss=1&gap.plf=5&tfd=1585 — 204 — 547 B — 116 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k0v9103337068za20g&_p=1776896460073&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AAgIAGA&_prs=wg&are=1&cid=358214152.1776896461&frm=0&pscdl=denied&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=2&tag_exp=0~115616985~115938465~115938468~117266400~117512543&cu=USD&sid=1776896460&sct=1&seg=0&dl=https%3A%2F%2Fearthsky.org%2F&dt=EarthSky%20%7C%20Updates%20on%20your%20cosmos%20and%20world&en=store&_c=1&gap.plf=5&epn.value=0&_et=6&tfd=1591region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k0v9103337068za20g&_p=1776896460073&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AAgIAGA&_prs=wg&are=1&cid=358214152.1776896461&frm=0&pscdl=denied&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=2&tag_exp=0~115616985~115938465~115938468~117266400~117512543&cu=USD&sid=1776896460&sct=1&seg=0&dl=https%3A%2F%2Fearthsky.org%2F&dt=EarthSky%20%7C%20Updates%20on%20your%20cosmos%20and%20world&en=store&_c=1&gap.plf=5&epn.value=0&_et=6&tfd=1591 — 204 — 48 B — 111 ms — h2https://id5-sync.com/bounceid5-sync.com/bounce https://id5-sync.com/bounce — 200 — 520 B — 28 ms — h2https://lbs.eu-1-id5-sync.com/lbs/v1lbs.eu-1-id5-sync.com/lbs/v1 https://lbs.eu-1-id5-sync.com/lbs/v1 — 200 — 157 B — 119 ms — h2https://lb.eu-1-id5-sync.com/lb/v1lb.eu-1-id5-sync.com/lb/v1 https://lb.eu-1-id5-sync.com/lb/v1 — 200 — 342 B — 117 ms — h2https://sli.earthsky.org/baker?dtstmp=1776896460528sli.earthsky.org/baker?dtstmp=17768... https://sli.earthsky.org/baker?dtstmp=1776896460528 — 200 — 541 B — 147 ms — h2https://d0.eu-3-id5-sync.com/d0.eu-3-id5-sync.com/ https://d0.eu-3-id5-sync.com/ — 200 — 143 B — 124 ms — h2https://d1.eu-3-id5-sync.com/d1.eu-3-id5-sync.com/ https://d1.eu-3-id5-sync.com/ — 200 — 143 B — 108 ms — h2https://d2.eu-3-id5-sync.com/d2.eu-3-id5-sync.com/ https://d2.eu-3-id5-sync.com/ — 200 — 143 B — 111 ms — h2https://d3.eu-3-id5-sync.com/d3.eu-3-id5-sync.com/ https://d3.eu-3-id5-sync.com/ — 200 — 143 B — 110 ms — h2https://d4.eu-3-id5-sync.com/d4.eu-3-id5-sync.com/ https://d4.eu-3-id5-sync.com/ — 200 — 143 B — 123 ms — h2https://d5.eu-3-id5-sync.com/d5.eu-3-id5-sync.com/ https://d5.eu-3-id5-sync.com/ — 200 — 143 B — 110 ms — h2https://d6.eu-3-id5-sync.com/d6.eu-3-id5-sync.com/ https://d6.eu-3-id5-sync.com/ — 200 — 143 B — 122 ms — h2https://d7.eu-3-id5-sync.com/d7.eu-3-id5-sync.com/ https://d7.eu-3-id5-sync.com/ — 200 — 143 B — 113 ms — h2https://d0.eu-4-id5-sync.com/d0.eu-4-id5-sync.com/ https://d0.eu-4-id5-sync.com/ — 200 — 143 B — 118 ms — h2https://d1.eu-4-id5-sync.com/d1.eu-4-id5-sync.com/ https://d1.eu-4-id5-sync.com/ — 200 — 143 B — 113 ms — h2https://d2.eu-4-id5-sync.com/d2.eu-4-id5-sync.com/ https://d2.eu-4-id5-sync.com/ — 200 — 143 B — 102 ms — h2https://d3.eu-4-id5-sync.com/d3.eu-4-id5-sync.com/ https://d3.eu-4-id5-sync.com/ — 200 — 143 B — 97 ms — h2https://d4.eu-4-id5-sync.com/d4.eu-4-id5-sync.com/ https://d4.eu-4-id5-sync.com/ — 200 — 143 B — 113 ms — h2https://d5.eu-4-id5-sync.com/d5.eu-4-id5-sync.com/ https://d5.eu-4-id5-sync.com/ — 200 — 143 B — 114 ms — h2https://d6.eu-4-id5-sync.com/d6.eu-4-id5-sync.com/ https://d6.eu-4-id5-sync.com/ — 200 — 143 B — 104 ms — h2https://d7.eu-4-id5-sync.com/d7.eu-4-id5-sync.com/ https://d7.eu-4-id5-sync.com/ — 200 — 143 B — 108 ms — h2https://id5-sync.com/gm/v3id5-sync.com/gm/v3 https://id5-sync.com/gm/v3 — 200 — 836 B — 27 ms — h2https://pagead2.googlesyndication.com/pagead/ping?e=1pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/ping?e=1 — 204 — 20 B — 87 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
63% of JavaScript execution is third-party
First-party Third-party 3520ms · 1382KB · $47/mo
Unattributable
Other
Costly
Execution 1076ms
Transfer 0 KB
Monthly Cost $14/mo
cdn.consentmanager.net
Other
Costly
Execution 405ms
Transfer 21 KB
Monthly Cost $5/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 378ms
Transfer 188 KB
Unused 70%
Monthly Cost $5/mo
ads.adthrive.com
Other
Costly
Execution 303ms
Transfer 370 KB
Unused 44%
Monthly Cost $4/mo
ads.adthrive.com
Other
Costly
Execution 288ms
Transfer 34 KB
Monthly Cost $4/mo
ads.adthrive.com
Other
Costly
Execution 229ms
Transfer 159 KB
Unused 72%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 202ms
Transfer 176 KB
Unused 38%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 138ms
Transfer 125 KB
Unused 49%
Monthly Cost $2/mo
b-code.liadm.com
Other
Optional
Execution 117ms
Transfer 46 KB
Monthly Cost $2/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution 97ms
Transfer 89 KB
Unused 64%
Monthly Cost $1/mo
cdn.id5-sync.com
Other
Optional
Execution 88ms
Transfer 30 KB
Monthly Cost $1/mo
iframely.net
Other
Optional
Execution 74ms
Transfer 8 KB
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 64ms
Transfer 34 KB
Monthly Cost $1/mo
cdn.consentmanager.net
Other
Optional
Execution 61ms
Transfer 101 KB
Unused 36%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1076ms and costs ~$14/month
  • cdn.consentmanager.net adds 405ms and costs ~$5/month
  • securepubads.g.doubleclick.net adds 378ms and costs ~$5/month
  • ads.adthrive.com adds 303ms and costs ~$4/month
  • ads.adthrive.com adds 288ms and costs ~$4/month
  • ads.adthrive.com adds 229ms and costs ~$3/month
  • Google Tag Manager adds 202ms and costs ~$3/month

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1076ms 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

cdn.consentmanager.net takes 405ms 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

securepubads.g.doubleclick.net takes 378ms 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

70% of securepubads.g.doubleclick.net'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

ads.adthrive.com takes 303ms 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

ads.adthrive.com takes 288ms 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

ads.adthrive.com takes 229ms 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

72% of ads.adthrive.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

Google Tag Manager takes 202ms 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

64% of c.aps.amazon-adsystem.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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