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https://astronomy.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.29 s

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

3.35 s

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

54 ms

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

0.006

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

2.22 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.

5.93 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 3 REVIEW 4 FIX
F
Page Weight Budget
Action
15.3 MB transferred, 156 requests
FIX
15.3 MB transferred, 156 requests
Critical::
Page weighs 19.9 MB (15.3 MB transferred)
Warning::
Images are 13.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 13.1 MB
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
156 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.2 g CO2 per page load
15.3 MB / 2.4 MB budget
15.3 MB transferred
156 requests
3.2 g CO2 per page load
Images 13.1 MiB 86%
JavaScript 1.7 MiB 11%
Other 134.0 KiB 1%
Fonts 123.4 KiB 1%
CSS 104.9 KiB 1%
HTML 78.1 KiB 0%
Other 16.5 KiB 0%
Other 3.5 KiB 0%
Other 1.0 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

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 (15.3 MiB of 15.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
56 scripts, 926 KB unused
FIX
56 scripts, 926 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.blogherads.com/static/chunks/5273.eec6...: 96 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHW...: 69 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 926 KB
926 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://ads.blogherads.com/static/chunks/5273.eec6f62e6c9beefc4be4.js132 KB96 KB (79%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHWV7HZ144 KB69 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2R82D8QZG9&cx=c&gtm=4e64k1155 KB63 KB (41%)✓3rd
https://olytics.omeda.com/olytics/js/v3/p/olytics.min.js71 KB46 KB (66%)✓3rd
https://ads.blogherads.com/static/chunks/831.b113b40433677910de75.js43 KB35 KB (81%)✓3rd
https://fundingchoicesmessages.google.com/i/pub-9489621755605348?ers=170 KB35 KB (51%)✓3rd
https://ads.blogherads.com/static/chunks/3622.7d0e84ccad5146cd86e6.js50 KB30 KB (82%)✓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
156 resources · 15.3 MB · 926 KB savings available
FIX
156 resources · 15.3 MB · 926 KB savings available
Warning::
Page weight 14.3 MB over 1MB target
Got: 15.3 MB Expected: ≤ 1 MB
Info::
~926 KB of savings available
Warning::
155 third-party resources (100% of weight)
Info::
8 resources over 200KB
156 resources · 15.3 MiB · 155 third-party 14.3 MiB over 1MB target
Image 86% · 13.1 MiB
JavaScript 11% · 1.7 MiB
Font 2% · 252.8 KiB
CSS 1% · 104.9 KiB
Document 1% · 80.1 KiB
Other 0% · 21.2 KiB

~925.9 KiB of savings available

Remove unused JavaScript: 925.9 KiB
B
Image Optimization
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.astronomy.com/wp-content/uploads/2023/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 13.1 MB
0 oversized -0 KB
21 legacy format
1 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

C
JS Execution Cost
Action
1751ms total JS execution
REVIEW
1751ms total JS execution
Warning::
https://www.astronomy.com/: 363ms CPU time
Warning::
Unattributable: 307ms CPU time
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 240ms CPU time
Info::
https://s.dpmsrv.com/dpm_1784f0e37c1fdd6200c1e8b28...: 111ms CPU time
Info::
https://fundingchoicesmessages.google.com/i/pub-94...: 109ms CPU time
Warning::
Third-party scripts: 1751ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 17% Style & Layout 14% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.astronomy.com/363ms30ms4ms3rd
Unattributable307ms11ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js240ms200ms21ms3rd
https://s.dpmsrv.com/dpm_1784f0e37c1fdd6200c1e8b28e8caae5402e74e0.min.js111ms67ms1ms3rd
https://fundingchoicesmessages.google.com/i/pub-9489621755605348?ers=1109ms97ms7ms3rd
https://ads.blogherads.com/static/chunks/5273.eec6f62e6c9beefc4be4.js95ms88ms6ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxUypuaH-xPNNd5D1VxWe_5ZoKdYoyr1dE3P5w3lSqhalvE2RW-FzHF3zCMM0Pylu0LjNI3z2ZUGrBAJbsR6tyxi84eQ3uQUkKpk02upB9lUZqRLZWchZ19Ct_FTYW8-Yb6wBZYzwA==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODk3NjMxLDc0NjAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly93d3cuYXN0cm9ub215LmNvbS8iLG51bGwsW1s4LCJwU0prbzE5NklIMCJdLFs5LCJlbi1VUyJdLFszNSwiMTc3Njg5NzYzMSJdLFsxOSwiMSJdLFsyNCwiIl0sWzI5LCJmYWxzZSJdXV094ms43ms12ms3rd
https://www.astronomy.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.181ms69ms2ms3rd
https://cdn-cookieyes.com/client_data/8b2b503ea77987f25f16a19b/banner.js71ms56ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHWV7HZ64ms51ms11ms3rd

Showing top 10 of 14 scripts

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
14 fonts (253 KB)
PASS
14 fonts (253 KB)
Info::
14 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

14

253 KB total

Render-blocking

0

of 14

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 3.4 shttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-light.65dbd68a.woff2rubik-light.65dbd68a.woff2 https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-light.65dbd68a.woff2 — 25.5 KiB — 54 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-regular.18856bd2.woff2rubik-regular.18856bd2.... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-regular.18856bd2.woff2 — 25.9 KiB — 55 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-semibold.c5dee968.woff2rubik-semibold.c5dee968... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-semibold.c5dee968.woff2 — 26.9 KiB — 67 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-medium.ffa06caa.woff2rubik-medium.ffa06caa.w... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-medium.ffa06caa.woff2 — 25.4 KiB — 47 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-bold.2a7d0e11.woff2rubik-bold.2a7d0e11.woff2 https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-bold.2a7d0e11.woff2 — 25.6 KiB — 52 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-bold.2a7d0e11.woff2rubik-bold.2a7d0e11.woff2 https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-bold.2a7d0e11.woff2 — 0 B — 50 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-medium.ffa06caa.woff2rubik-medium.ffa06caa.w... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-medium.ffa06caa.woff2 — 0 B — 49 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-semibold.c5dee968.woff2rubik-semibold.c5dee968... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-semibold.c5dee968.woff2 — 0 B — 49 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-regular.18856bd2.woff2rubik-regular.18856bd2.... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-regular.18856bd2.woff2 — 0 B — 45 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-light.65dbd68a.woff2rubik-light.65dbd68a.woff2 https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-light.65dbd68a.woff2 — 0 B — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/firasans/v18/va9E4kDNxMZdWfMOD5Vvl4jLazX3dA.woff2va9E4kDNxMZdWfMOD5Vvl4j... https://fonts.gstatic.com/s/firasans/v18/va9E4kDNxMZdWfMOD5Vvl4jLazX3dA.woff2 — 17.1 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 75 ms — font-display: swaphttps://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-lightitalic.003cbe43.woff2rubik-lightitalic.003cb... https://www.astronomy.com/wp-content/themes/astronomy/dist/fonts/rubik-lightitalic.003cbe43.woff2 — 30.3 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.1 KiB — 44 ms — font-display: swap
rubik-light.65dbd68a.woff2 woff2 swap
Size 26 KB
Load time 54 ms
Start 510 ms
Risk FOUT — text flashes from fallback to web font
rubik-regular.18856bd2.... woff2 swap
Size 26 KB
Load time 55 ms
Start 511 ms
Risk FOUT — text flashes from fallback to web font
rubik-semibold.c5dee968... woff2 swap
Size 27 KB
Load time 67 ms
Start 511 ms
Risk FOUT — text flashes from fallback to web font
rubik-medium.ffa06caa.w... woff2 swap
Size 25 KB
Load time 47 ms
Start 511 ms
Risk FOUT — text flashes from fallback to web font
rubik-bold.2a7d0e11.woff2 woff2 swap
Size 26 KB
Load time 52 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
rubik-bold.2a7d0e11.woff2 woff2 swap
Size 0 KB
Load time 50 ms
Start 530 ms
Risk FOUT — text flashes from fallback to web font
rubik-medium.ffa06caa.w... woff2 swap
Size 0 KB
Load time 49 ms
Start 531 ms
Risk FOUT — text flashes from fallback to web font
rubik-semibold.c5dee968... woff2 swap
Size 0 KB
Load time 49 ms
Start 531 ms
Risk FOUT — text flashes from fallback to web font
rubik-regular.18856bd2.... woff2 swap
Size 0 KB
Load time 45 ms
Start 531 ms
Risk FOUT — text flashes from fallback to web font
rubik-light.65dbd68a.woff2 woff2 swap
Size 0 KB
Load time 45 ms
Start 531 ms
Risk FOUT — text flashes from fallback to web font
va9E4kDNxMZdWfMOD5Vvl4j... woff2 swap
Size 17 KB
Load time 41 ms
Start 594 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 75 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
rubik-lightitalic.003cb... woff2 swap
Size 30 KB
Load time 26 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 44 ms
Start 2.4 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
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600, must-revalidate
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600, must-revalidate

DirectiveValueMeaning
max-age600Cache for 10 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 600 seconds
Network Waterfall
156 requests over 3725ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 3.4 shttps://astronomy.com// https://astronomy.com/ — 301 — 722 B — 184 ms — h2https://www.astronomy.com/www.astronomy.com/ https://www.astronomy.com/ — 200 — 45.8 KiB — 207 ms — h3https://olytics.omeda.com/olytics/css/v3/p/olytics.cssolytics.omeda.com/olytics/css/v3/p/... https://olytics.omeda.com/olytics/css/v3/p/olytics.css — 200 — 3.3 KiB — 21 ms — h2https://www.astronomy.com/wp-content/uploads/2023/01/cropped-Logo-white@2x.pngwww.astronomy.com/wp-content/upload... https://www.astronomy.com/wp-content/uploads/2023/01/cropped-Logo-white@2x.png — 200 — 2.4 KiB — 43 ms — h3https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/blocks/pic-of-the-day/styles.css?ver=76de2ad23e6705f17dcdbe997ba98039www.astronomy.com/wp-content/plugin... https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/blocks/pic-of-the-day/styles.css?ver=76de2ad23e6705f17dcdbe997ba98039 — 200 — 454 B — 31 ms — h3https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/blocks/post-content-selector/styles.css?ver=cc14531cd3d27fb7a0d5c45a67189f41www.astronomy.com/wp-content/plugin... https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/blocks/post-content-selector/styles.css?ver=cc14531cd3d27fb7a0d5c45a67189f41 — 200 — 1.5 KiB — 27 ms — h3https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/lib/css/glide.core.min.css?ver=1.0.0www.astronomy.com/wp-content/plugin... https://www.astronomy.com/wp-content/plugins/astronomy-core/dist/lib/css/glide.core.min.css?ver=1.0.0 — 200 — 555 B — 31 ms — h3https://www.astronomy.com/wp-content/plugins/fc-top-banner/style.css?ver=1.1.5www.astronomy.com/wp-content/plugin... https://www.astronomy.com/wp-content/plugins/fc-top-banner/style.css?ver=1.1.5 — 200 — 1004 B — 32 ms — h3https://www.astronomy.com/wp-content/plugins/sheknows-infuse/public/css/style.css?ver=1.0.43www.astronomy.com/wp-content/plugin... 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302 — 857 B — 300 ms — http/1.1https://pixel.mathtag.com/event/img?mt_id=2373830&mt_adid=431650pixel.mathtag.com/event/img?mt_id=2... https://pixel.mathtag.com/event/img?mt_id=2373830&mt_adid=431650 — 302 — 857 B — 300 ms — http/1.1https://insight.adsrvr.org/track/pxl/?adv=f6ba480&ct=0:0qwxs84&fmt=3insight.adsrvr.org/track/pxl/?adv=f... https://insight.adsrvr.org/track/pxl/?adv=f6ba480&ct=0:0qwxs84&fmt=3 — 200 — 149 B — 111 ms — h2https://insight.adsrvr.org/track/pxl/?adv=f6ba480&ct=0:s161583&fmt=3insight.adsrvr.org/track/pxl/?adv=f... https://insight.adsrvr.org/track/pxl/?adv=f6ba480&ct=0:s161583&fmt=3 — 200 — 148 B — 113 ms — h2https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 281 B — 407 ms — http/1.1https://ib.adnxs.com/bounce?%2Fseg%3Fmember%3D827%26consent%3D1%26add%3D39584851%2C39580835ib.adnxs.com/bounce?%2Fseg%3Fmember... https://ib.adnxs.com/bounce?%2Fseg%3Fmember%3D827%26consent%3D1%26add%3D39584851%2C39580835 — 200 — 923 B — 29 ms — h2https://pixel.mathtag.com/event/img?primary-x-request-id=d8d40b225abb39b1b49e99c701b2ddc1&mt_id=2373830&mt_adid=431650pixel.mathtag.com/event/img?primary... https://pixel.mathtag.com/event/img?primary-x-request-id=d8d40b225abb39b1b49e99c701b2ddc1&mt_id=2373830&mt_adid=431650 — 200 — 755 B — 104 ms — http/1.1https://pixel.mathtag.com/event/img?primary-x-request-id=a551232f4c56a25ff52d275322b584e3&mt_id=2373835&mt_adid=431650pixel.mathtag.com/event/img?primary... https://pixel.mathtag.com/event/img?primary-x-request-id=a551232f4c56a25ff52d275322b584e3&mt_id=2373835&mt_adid=431650 — 200 — 755 B — 101 ms — http/1.1
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 1751ms · 770KB · €19/mo
www.astronomy.com
Other
Costly
Execution 363ms
Transfer 46 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 307ms
Transfer 0 KB
Monthly Cost €3/mo
www.gstatic.com
Other
Costly
Execution 240ms
Transfer 0 KB
Unused 49%
Monthly Cost €3/mo
s.dpmsrv.com
Other
Optional
Execution 111ms
Transfer 14 KB
Monthly Cost €1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 109ms
Transfer 70 KB
Unused 51%
Monthly Cost €1/mo
ads.blogherads.com
Other
Optional
Execution 95ms
Transfer 132 KB
Unused 79%
Monthly Cost €1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 94ms
Transfer 72 KB
Monthly Cost €1/mo
www.astronomy.com
Other
Optional
Execution 81ms
Transfer 31 KB
Unused 66%
Monthly Cost €1/mo
cdn-cookieyes.com
Other
Optional
Execution 71ms
Transfer 9 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 144 KB
Unused 48%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 56ms
Transfer 26 KB
Monthly Cost €1/mo
www.astronomy.com
Other
Optional
Execution 54ms
Transfer 0 KB
Monthly Cost €1/mo
olytics.omeda.com
Other
Optional
Execution 54ms
Transfer 71 KB
Unused 66%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 155 KB
Unused 41%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.astronomy.com adds 363ms and costs ~€4/month
  • Unattributable adds 307ms and costs ~€3/month
  • www.gstatic.com adds 240ms and costs ~€3/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

www.astronomy.com takes 363ms 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 307ms 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.gstatic.com takes 240ms 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

51% of fundingchoicesmessages.google.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

79% of ads.blogherads.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

66% of www.astronomy.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

66% of olytics.omeda.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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