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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.60 s

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

12.72 s

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

600 ms

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

0.003

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

5.39 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.

12.81 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
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 87 requests
FIX
2.7 MB transferred, 87 requests
Warning::
Page weighs 5.8 MB (2.7 MB transferred)
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
87 HTTP requests
Info::
Estimated 0.56 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
87 requests
0.56 g CO2 per page load
Images 1.3 MiB 48%
JavaScript 1.1 MiB 42%
CSS 114.0 KiB 4%
Fonts 96.1 KiB 4%
Other 24.2 KiB 1%
HTML 21.5 KiB 1%
Other 15.2 KiB 1%
Other 554 B 0%
Other 385 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

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 (2.7 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2733ms total JS execution
FIX
2733ms total JS execution
Warning::
https://www.annualreviews.org/: 516ms CPU time
Warning::
Unattributable: 469ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-G7V9...: 327ms CPU time
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 281ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KL6...: 240ms CPU time
Warning::
Third-party scripts: 2733ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 19% Style & Layout 13% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://www.annualreviews.org/516ms6ms2ms3rd
Unattributable469ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-G7V965V32T&cx=c&gtm=4e64h1327ms275ms50ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604210101/show_ads_impl_fy2021.js?bust=31098020281ms226ms46ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KL6C9MW240ms192ms41ms3rd
https://cdn.openshareweb.com/v2/71c6eb22/main.js179ms150ms15ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js175ms112ms61ms3rd
https://www.annualreviews.org/js/v/12.4.0/jp/jquery-1.11.1.min.js133ms114ms8ms3rd
https://www.annualreviews.org/common/v/12.4.0/js/plugins.js103ms48ms42ms3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-844832035929470385ms70ms15ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
23 scripts, 586 KB unused
FIX
23 scripts, 586 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 145 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 135 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.annualreviews.org/common/v/12.4.0/js/p...: 85 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-G7V9...: 71 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KL6...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 586 KB
586 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB145 KB (77%)✓3rd
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604210101/show_ads_impl_fy2021.js?bust=31098020177 KB135 KB (76%)✓3rd
https://www.annualreviews.org/common/v/12.4.0/js/plugins.js117 KB85 KB (74%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-G7V965V32T&cx=c&gtm=4e64h1176 KB71 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KL6C9MW146 KB65 KB (45%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/config/TeX-AMS-MML_HTMLorMML.js?V=2.7.760 KB33 KB (55%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-844832035929470354 KB31 KB (58%)✓3rd
https://cdn.openshareweb.com/v2/71c6eb22/main.js41 KB21 KB (51%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS-MML_HTMLorMML17 KB—✓3rd
https://cdn.shareaholic.net/assets/pub/shareaholic.js5 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
87 resources · 2.7 MB · 586 KB savings available
FIX
87 resources · 2.7 MB · 586 KB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~586 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
2 resources over 200KB
87 resources · 2.7 MiB · 86 third-party 1.7 MiB over 1MB target
Image 48% · 1.3 MiB
JavaScript 42% · 1.1 MiB
CSS 4% · 114.0 KiB
Font 4% · 96.1 KiB
Other 1% · 38.7 KiB
Document 1% · 21.9 KiB

~586.4 KiB of savings available

Remove unused JavaScript: 586.4 KiB
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
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
https://www.annualreviews.org/images/hybrid/logo-k... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.annualreviews.org/docserver/fulltext/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.annualreviews.org/docserver/fulltext/t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.annualreviews.org/images/hybrid/logo-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.annualreviews.org/docserver/fulltext/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 1.3 MB
0 oversized -0 KB
38 legacy format
5 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

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
7 fonts (96 KB)
PASS
7 fonts (96 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

96 KB total

Render-blocking

0

of 7

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 FCP 3.6 s LCP 12.7 sdata:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBi4AAAC8AAAAYGNtYXD9Z7jOAA…x-font-ttf;charset=utf-... data:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SBi4AAAC8AAAAYGNtYXD9Z7jOAA… — 11.6 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v22/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v22/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7l.woff2 — 14.6 KiB — 81 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu.woff2 — 14.4 KiB — 96 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu.woff2 — 14.5 KiB — 89 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v22/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu.woff2 — 14.5 KiB — 93 ms — font-display: swaphttps://www.annualreviews.org/css/hybrid/bespoke-fonts/icomoon-social.woff?iq6ck1icomoon-social.woff https://www.annualreviews.org/css/hybrid/bespoke-fonts/icomoon-social.woff?iq6ck1 — 8.5 KiB — 433 ms — font-display: swaphttps://www.annualreviews.org/css/hybrid/bespoke-fonts/icomoon.ttf?iq6ck0icomoon.ttf https://www.annualreviews.org/css/hybrid/bespoke-fonts/icomoon.ttf?iq6ck0 — 18.1 KiB — 535 ms — font-display: swap
x-font-ttf;charset=utf-... unknown swap
Size 12 KB
Load time 46 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 81 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 96 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 89 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 93 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
icomoon-social.woff woff swap
Size 8 KB
Load time 433 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon.ttf ttf swap
Size 18 KB
Load time 535 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~11 KB and ~22 ms

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+
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
87 requests over 3887ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 12.7 shttps://annualreviews.org// https://annualreviews.org/ — 301 — 381 B — 207 ms — h2https://www.annualreviews.org/www.annualreviews.org/ https://www.annualreviews.org/ — 200 — 11.9 KiB — 535 ms — h2https://cdn.shareaholic.net/assets/pub/shareaholic.jscdn.shareaholic.net/assets/pub/shar... https://cdn.shareaholic.net/assets/pub/shareaholic.js — 200 — 4.8 KiB — 99 ms — h2https://www.annualreviews.org/css/v/12.4.0/hybrid/google-fonts.csswww.annualreviews.org/css/v/12.4.0/... https://www.annualreviews.org/css/v/12.4.0/hybrid/google-fonts.css — 200 — 1.3 KiB — 173 ms — h2https://www.annualreviews.org/common/v/12.4.0/css/component.csswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/css/component.css — 200 — 2.4 KiB — 163 ms — h2https://www.annualreviews.org/css/v/12.4.0/hybrid/site.csswww.annualreviews.org/css/v/12.4.0/... https://www.annualreviews.org/css/v/12.4.0/hybrid/site.css — 200 — 72.8 KiB — 317 ms — h2https://www.annualreviews.org/css/v/12.4.0/hybrid/main-masthead.csswww.annualreviews.org/css/v/12.4.0/... https://www.annualreviews.org/css/v/12.4.0/hybrid/main-masthead.css — 200 — 5.0 KiB — 162 ms — h2https://www.annualreviews.org/css/v/12.4.0/hybrid/annualreviews.csswww.annualreviews.org/css/v/12.4.0/... https://www.annualreviews.org/css/v/12.4.0/hybrid/annualreviews.css — 200 — 16.4 KiB — 200 ms — h2https://www.annualreviews.org/css/v/12.4.0/hybrid/annualreviews-home.csswww.annualreviews.org/css/v/12.4.0/... https://www.annualreviews.org/css/v/12.4.0/hybrid/annualreviews-home.css — 200 — 14.1 KiB — 525 ms — h2https://cdnjs.cloudflare.com/ajax/libs/froala-editor/2.8.1/css/froala_style.min.csscdnjs.cloudflare.com/ajax/libs/froa... https://cdnjs.cloudflare.com/ajax/libs/froala-editor/2.8.1/css/froala_style.min.css — 200 — 2.0 KiB — 91 ms — h2https://www.annualreviews.org/common/v/12.4.0/js/vendor/modernizer.custom.min.jswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/js/vendor/modernizer.custom.min.js — 200 — 8.2 KiB — 142 ms — h2https://www.annualreviews.org/js/v/12.4.0/jp/jquery-1.11.1.min.jswww.annualreviews.org/js/v/12.4.0/j... https://www.annualreviews.org/js/v/12.4.0/jp/jquery-1.11.1.min.js — 200 — 32.9 KiB — 254 ms — h2https://www.annualreviews.org/common/v/12.4.0/js/jquery.dlmenu.jswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/js/jquery.dlmenu.js — 200 — 2.3 KiB — 137 ms — h2https://www.annualreviews.org/docserver/fulltext/InstLoginIco_15x15.pngwww.annualreviews.org/docserver/ful... https://www.annualreviews.org/docserver/fulltext/InstLoginIco_15x15.png — 200 — 832 B — 27 ms — h2https://www.annualreviews.org/images/hybrid/ar-logo-1479872034357.svgwww.annualreviews.org/images/hybrid... https://www.annualreviews.org/images/hybrid/ar-logo-1479872034357.svg — 200 — 1.1 KiB — 144 ms — h2https://www.annualreviews.org/images/hybrid/AR_white_Logo-1665986338647.webpwww.annualreviews.org/images/hybrid... https://www.annualreviews.org/images/hybrid/AR_white_Logo-1665986338647.webp — 200 — 3.1 KiB — 121 ms — h2https://www.annualreviews.org/images/hybrid/logo-ar.svgwww.annualreviews.org/images/hybrid... https://www.annualreviews.org/images/hybrid/logo-ar.svg — 200 — 1.3 KiB — 415 ms — h2https://www.annualreviews.org/js/v/12.4.0/jp/jquery.form.jswww.annualreviews.org/js/v/12.4.0/j... https://www.annualreviews.org/js/v/12.4.0/jp/jquery.form.js — 200 — 8.3 KiB — 137 ms — h2https://www.annualreviews.org/common/v/12.4.0/js/plugins.jswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/js/plugins.js — 200 — 117.2 KiB — 235 ms — h2https://www.annualreviews.org/common/v/12.4.0/js/sitejp.jswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/js/sitejp.js — 200 — 12.5 KiB — 175 ms — h2https://www.annualreviews.org/common/v/12.4.0/js/site_common.jswww.annualreviews.org/common/v/12.4... https://www.annualreviews.org/common/v/12.4.0/js/site_common.js — 200 — 6.5 KiB — 132 ms — h2https://www.annualreviews.org/js/v/12.4.0/jp/platform.jswww.annualreviews.org/js/v/12.4.0/j... https://www.annualreviews.org/js/v/12.4.0/jp/platform.js — 200 — 2.9 KiB — 136 ms — h2https://www.annualreviews.org/js/v/12.4.0/hybrid/site.jswww.annualreviews.org/js/v/12.4.0/h... https://www.annualreviews.org/js/v/12.4.0/hybrid/site.js — 200 — 23.3 KiB — 175 ms — h2https://www.googletagservices.com/tag/js/gpt.jswww.googletagservices.com/tag/js/gp... https://www.googletagservices.com/tag/js/gpt.js — 200 — 34.0 KiB — 136 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8448320359294703pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8448320359294703 — 200 — 54.2 KiB — 143 ms — 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h2https://www.annualreviews.org/docserver/fulltext/open-access-open-science-turmoil-japan-558x362.pngwww.annualreviews.org/docserver/ful... https://www.annualreviews.org/docserver/fulltext/open-access-open-science-turmoil-japan-558x362.png — 200 — 43.1 KiB — 25 ms — h2https://www.annualreviews.org/images/jp//ui-bg_glass_75_ffffff_1x400.pngwww.annualreviews.org/images/jp//ui... https://www.annualreviews.org/images/jp//ui-bg_glass_75_ffffff_1x400.png — 200 — 542 B — 129 ms — h2https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gda&tv=r20260420&st=env&sjk=476188651439400ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gda&tv=r20260420&st=env&sjk=476188651439400 — 200 — 13.4 KiB — 84 ms — h3https://www.annualreviews.org/upload/favicon.icowww.annualreviews.org/upload/favico... https://www.annualreviews.org/upload/favicon.ico — 200 — 892 B — 151 ms — 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— 204 — 17 B — 46 ms — h3
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 2733ms · 1055KB · $36/mo
www.annualreviews.org
Other
Costly
Execution 516ms
Transfer 12 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 469ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 327ms
Transfer 176 KB
Unused 40%
Monthly Cost $4/mo
pagead2.googlesyndication.com
Other
Costly
Execution 281ms
Transfer 177 KB
Unused 76%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 240ms
Transfer 146 KB
Unused 45%
Monthly Cost $3/mo
cdn.openshareweb.com
Other
Optional
Execution 179ms
Transfer 41 KB
Unused 51%
Monthly Cost $2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 175ms
Transfer 188 KB
Unused 77%
Monthly Cost $2/mo
www.annualreviews.org
Other
Optional
Execution 133ms
Transfer 33 KB
Monthly Cost $2/mo
www.annualreviews.org
Other
Optional
Execution 103ms
Transfer 117 KB
Unused 74%
Monthly Cost $1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 85ms
Transfer 54 KB
Unused 58%
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 83ms
Transfer 60 KB
Unused 55%
Monthly Cost $1/mo
www.googletagservices.com
Other
Optional
Execution 73ms
Transfer 34 KB
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 67ms
Transfer 17 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.annualreviews.org adds 516ms and costs ~$7/month
  • Unattributable adds 469ms and costs ~$6/month
  • Google Tag Manager adds 327ms and costs ~$4/month
  • pagead2.googlesyndication.com adds 281ms and costs ~$4/month
  • Google Tag Manager 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.annualreviews.org takes 516ms 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 469ms 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

Google Tag Manager takes 327ms 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

pagead2.googlesyndication.com takes 281ms 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

76% of pagead2.googlesyndication.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 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 cdn.openshareweb.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

77% 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

74% of www.annualreviews.org'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

58% of pagead2.googlesyndication.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

55% of cdnjs'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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