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https://earthsky.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
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.

818 ms

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

1.14 s

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

20 ms

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

0.078

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

2.31 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.

4.60 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
7 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 148 requests
FIX
5.0 MB transferred, 148 requests
Critical::
Page weighs 10.3 MB (5.0 MB transferred)
Warning::
Images are 3.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.0 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::
148 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
148 requests
1.1 g CO2 per page load
Images 3.0 MiB 59%
JavaScript 1.6 MiB 32%
Fonts 169.2 KiB 3%
CSS 158.2 KiB 3%
Other 35.4 KiB 1%
HTML 33.9 KiB 1%
Other 25.0 KiB 0%
Other 23.8 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 Bundles
Action
33 scripts, 662 KB unused
FIX
33 scripts, 662 KB unused
Warning::
https://ads.adthrive.com/builds/core/772eda3/es201...: 163 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 130 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/772eda3/gdpr/...: 124 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5TNL...: 63 KB unused (36%)
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: 662 KB
662 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/772eda3/es2018/js/adthrive.min.js?deployment=2026-04-22-09:pe-1015:772eda3:4&bucket=flex-56&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 KB163 KB (44%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB130 KB (69%)✓3rd
https://ads.adthrive.com/builds/core/772eda3/gdpr/vendor/prebid/es2018/prebid.min.js173 KB124 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5TNL0C8RD8&cx=c&gtm=4e64k1h2176 KB63 KB (36%)✓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 KB36 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
148 resources · 5.0 MB · 662 KB savings available
FIX
148 resources · 5.0 MB · 662 KB savings available
Warning::
Page weight 4.0 MB over 1MB target
Got: 5.0 MB Expected: ≤ 1 MB
Info::
~662 KB of savings available
Info::
77 third-party resources (36% of weight)
Info::
4 resources over 200KB
148 resources · 5.0 MiB · 77 third-party 4.0 MiB over 1MB target
Image 59% · 3.0 MiB
JavaScript 32% · 1.6 MiB
Font 3% · 169.2 KiB
CSS 3% · 158.2 KiB
Other 2% · 78.3 KiB
Document 1% · 34.2 KiB

~662.2 KiB of savings available

Remove unused JavaScript: 662.2 KiB
C
Image Optimization
Action
53 images, 0 KB saveable
REVIEW
53 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.
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.
53 images 3.0 MB
0 oversized -0 KB
51 legacy format
12 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

C
JS Execution Cost
Action
1246ms total JS execution
REVIEW
1246ms total JS execution
Warning::
Unattributable: 296ms CPU time
Info::
https://earthsky.org/: 193ms CPU time
Info::
https://earthsky.org/wp-content/themes/earthsky-te...: 180ms CPU time
Info::
https://cdn.consentmanager.net/delivery/customdata...: 109ms CPU time
Info::
https://securepubads.g.doubleclick.net/pagead/mana...: 83ms CPU time
Warning::
Third-party scripts: 745ms (60% of total)

Main Thread Breakdown

Script Evaluation 54% Other 20% Style & Layout 11% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable296ms64ms0ms3rd
https://earthsky.org/193ms91ms3ms1st
https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/js/webflow.js?v=1620812547627180ms43ms13ms1st
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF8zNDc0Mi54XzEwMi52LnAudF8zNDc0Mi54dF8xNTA.js109ms103ms2ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js83ms67ms13ms3rd
https://ads.adthrive.com/sites/5d668609cc7cae09064f6362/ads.min.js?referrer=https%3A%2F%2Fearthsky.org%2F&cb=876ms63ms2ms3rd
https://ads.adthrive.com/builds/core/772eda3/es2018/js/adthrive.min.js?deployment=2026-04-22-09:pe-1015:772eda3:4&bucket=flex-56&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=5d668609cc7cae09064f636272ms37ms30ms3rd
https://earthsky.org/cdn-cgi/challenge-platform/scripts/jsd/main.js66ms63ms1ms1st
https://earthsky.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.162ms34ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-5TNL0C8RD8&cx=c&gtm=4e64k1h258ms46ms12ms3rd

Showing top 10 of 11 scripts

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
36% third-party, 0 ms blocking
PASS
36% third-party, 0 ms blocking
Info::
Third-party code accounts for 36% of page weight (1.8 MiB of 5.0 MiB)
Info::
Third-party blocking time is low (0 ms)
64%
36%
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 500 ms 1.0 s 1.5 s FCP 818 ms LCP 1.1 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 — 48 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 — 47 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_SKggPN4iEgvnHyvveLxVvaorCIPrEVIT9d0c8.woff21Ptxg8zYS_SKggPN4iEgvnH... https://fonts.gstatic.com/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVIT9d0c8.woff2 — 17.1 KiB — 31 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 63 ms
Start 431 ms
Risk FOUT — text flashes from fallback to web font
nKKQ-GM_FYFRJvXzVXaAPe9... woff2 swap
Size 25 KB
Load time 58 ms
Start 432 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 48 ms
Start 476 ms
Risk FOUT — text flashes from fallback to web font
nKKQ-GM_FYFRJvXzVXaAPe9... woff2 swap
Size 34 KB
Load time 47 ms
Start 476 ms
Risk FOUT — text flashes from fallback to web font
MCoTzAn-1s3IGyJMVacY37H... woff2 swap
Size 8 KB
Load time 31 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
1Ptxg8zYS_SKggPN4iEgvnH... woff2 swap
Size 17 KB
Load time 31 ms
Start 1.6 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
148 requests over 2399ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 818 ms LCP 1.1 shttps://earthsky.org// https://earthsky.org/ — 200 — 26.5 KiB — 69 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 — 2.7 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 — 9.4 KiB — 30 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 — 124 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 — 32 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 — 748 B — 37 ms — 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187.7 KiB — 81 ms — h3https://cdn.jwplayer.com/v2/playlists/J3JoJvUv?max_resolution=1280cdn.jwplayer.com/v2/playlists/J3JoJ... https://cdn.jwplayer.com/v2/playlists/J3JoJvUv?max_resolution=1280 — 200 — 28.3 KiB — 1.1 s — h2https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fearthsky.org%2F&domain=earthsky.org&cw=1&lsw=1gum.criteo.com/sid/json?origin=preb... https://gum.criteo.com/sid/json?origin=prebid&topUrl=https%3A%2F%2Fearthsky.org%2F&domain=earthsky.org&cw=1&lsw=1 — 200 — 0 B — 104 ms — h2https://id5-sync.com/api/config/prebidid5-sync.com/api/config/prebid https://id5-sync.com/api/config/prebid — 200 — 641 B — 86 ms — h2https://cdn.id5-sync.com/api/1.0/id5PrebidModule.jscdn.id5-sync.com/api/1.0/id5PrebidM... https://cdn.id5-sync.com/api/1.0/id5PrebidModule.js — 200 — 29.5 KiB — 73 ms — h2https://id.crwdcntrl.net/id?c=17297id.crwdcntrl.net/id?c=17297 https://id.crwdcntrl.net/id?c=17297 — 200 — 318 B — 113 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k1h2v9103337068za20g&_p=1776896477546&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AgAIAGA&are=1&cid=577484870.1776896479&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938468~117266401~117512542&sid=1776896478&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=1674 — 204 — 547 B — 83 ms — 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https://region1.google-analytics.com/measurement/conversion?random=1776896479002&cv=11&tid=G-5TNL0C8RD8&fst=1776896479002&fmt=8&en=store&gtm=45je64k1h2v9103337068za20gxec&gcs=G100&gcd=13q3pPq2q5l1&dma_cps=-&dma=1&tcfd=10v5r&tag_exp=0~115616985~115938465~115938468~117266401~117512542&u_w=800&u_h=600&url=https%3A%2F%2Fearthsky.org%2F&gacid=577484870.1776896479&frm=0&tiba=EarthSky%20%7C%20Updates%20on%20your%20cosmos%20and%20world&value=0&currency_code=USD&gdid=dMzk4MW&npa=1&us_privacy=1---&gdpr=1&gdpr_consent=CQjEJsAQjEJsAAfKtCENCbFgAAAAAEPgAAigAAAUEgYAALAAcABUAC4AHAAPAAgABIACoAGQANAAcAA8ACKAEwAKoAaAA_ACEAEcAJwAVoAwABlADRAHIAOcAdwA_YCDgIQARYAn4BrwDiAHbAPaAf8BMQChwFSgLzAZIAywB8gEbwI7ATpAoIAA.IKVpB9C5cRSFH4CJ3IJoEYAQXwFBAYkAgBgQBAwABSBKAIIwEkAAAAACIIAAAAAAAIABAAAAACAgAAEAAAIAAIQAIAEAAAAACIAAAAAABAAAAAAgAAAAgEAAAAAAAAgAAgAAAAAIAQEgAAAAAAQAAIAAAAAAAAAAAAAAAQAAAQAAAAKgAAAAAAAAAAAAACBAIEAAAAAAAAAAAAAAAAAACAAAAQAAAAAC.YAAACHwAAAA&pscdl=denied&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&rcb=14 — 204 — 237 B — 82 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k1h2v9103337068za20g&_p=1776896477546&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AAgIAGA&_prs=ok&are=1&cid=577484870.1776896479&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616985~115938465~115938468~117266401~117512542&cu=USD&sid=1776896478&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=7&tfd=1687region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-5TNL0C8RD8&gtm=45je64k1h2v9103337068za20g&_p=1776896477546&gcs=G100&gcd=13q3pPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=10v5r&gdid=dMzk4MW&_eu=AAgIAGA&_prs=ok&are=1&cid=577484870.1776896479&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616985~115938465~115938468~117266401~117512542&cu=USD&sid=1776896478&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=7&tfd=1687 — 204 — 48 B — 72 ms — h2https://id5-sync.com/bounceid5-sync.com/bounce https://id5-sync.com/bounce — 200 — 520 B — 27 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 — 80 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 — 82 ms — h2https://d0.eu-3-id5-sync.com/d0.eu-3-id5-sync.com/ https://d0.eu-3-id5-sync.com/ — 200 — 143 B — 95 ms — h2https://d1.eu-3-id5-sync.com/d1.eu-3-id5-sync.com/ https://d1.eu-3-id5-sync.com/ — 200 — 143 B — 98 ms — h2https://d2.eu-3-id5-sync.com/d2.eu-3-id5-sync.com/ https://d2.eu-3-id5-sync.com/ — 200 — 143 B — 96 ms — h2https://d3.eu-3-id5-sync.com/d3.eu-3-id5-sync.com/ https://d3.eu-3-id5-sync.com/ — 200 — 143 B — 104 ms — h2https://d4.eu-3-id5-sync.com/d4.eu-3-id5-sync.com/ https://d4.eu-3-id5-sync.com/ — 200 — 143 B — 96 ms — h2https://d5.eu-3-id5-sync.com/d5.eu-3-id5-sync.com/ https://d5.eu-3-id5-sync.com/ — 200 — 143 B — 105 ms — h2https://d6.eu-3-id5-sync.com/d6.eu-3-id5-sync.com/ https://d6.eu-3-id5-sync.com/ — 200 — 143 B — 114 ms — h2https://d7.eu-3-id5-sync.com/d7.eu-3-id5-sync.com/ https://d7.eu-3-id5-sync.com/ — 200 — 143 B — 107 ms — h2https://d0.eu-4-id5-sync.com/d0.eu-4-id5-sync.com/ https://d0.eu-4-id5-sync.com/ — 200 — 143 B — 95 ms — h2https://d1.eu-4-id5-sync.com/d1.eu-4-id5-sync.com/ https://d1.eu-4-id5-sync.com/ — 200 — 143 B — 95 ms — h2https://d2.eu-4-id5-sync.com/d2.eu-4-id5-sync.com/ https://d2.eu-4-id5-sync.com/ — 200 — 143 B — 100 ms — h2https://d3.eu-4-id5-sync.com/d3.eu-4-id5-sync.com/ https://d3.eu-4-id5-sync.com/ — 200 — 143 B — 107 ms — h2https://d4.eu-4-id5-sync.com/d4.eu-4-id5-sync.com/ https://d4.eu-4-id5-sync.com/ — 200 — 143 B — 105 ms — h2https://d5.eu-4-id5-sync.com/d5.eu-4-id5-sync.com/ https://d5.eu-4-id5-sync.com/ — 200 — 143 B — 94 ms — h2https://d6.eu-4-id5-sync.com/d6.eu-4-id5-sync.com/ https://d6.eu-4-id5-sync.com/ — 200 — 143 B — 108 ms — h2https://d7.eu-4-id5-sync.com/d7.eu-4-id5-sync.com/ https://d7.eu-4-id5-sync.com/ — 200 — 143 B — 110 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 — 88 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
60% of JavaScript execution is third-party
First-party Third-party 745ms · 963KB · $10/mo
Unattributable
Other
Costly
Execution 296ms
Transfer 0 KB
Monthly Cost $4/mo
cdn.consentmanager.net
Other
Optional
Execution 109ms
Transfer 22 KB
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 83ms
Transfer 188 KB
Unused 69%
Monthly Cost $1/mo
ads.adthrive.com
Other
Optional
Execution 76ms
Transfer 34 KB
Monthly Cost $1/mo
ads.adthrive.com
Other
Optional
Execution 72ms
Transfer 370 KB
Unused 44%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 176 KB
Unused 36%
Monthly Cost $1/mo
ads.adthrive.com
Other
Optional
Execution 51ms
Transfer 173 KB
Unused 72%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 296ms and costs ~$4/month

60% 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 296ms 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

69% 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

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

How third-party costs are calculated

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