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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

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

945 ms

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

1.22 s

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

4 ms

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

0.025

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

945 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.50 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 4 REVIEW 2 FIX
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 (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
40 scripts, 206 KB unused
FIX
40 scripts, 206 KB unused
Warning::
https://www.scientificamerican.com/static/chunks/i...: 81 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5FL...: 76 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.scientificamerican.com/static/chunks/v...: 48 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.scientificamerican.com/sciads/sciads.j...: unminified — 7 KB could be saved
Info::
Total unused JavaScript: 206 KB
206 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.scientificamerican.com/static/chunks/index-DdtKFinu.js126 KB81 KB (66%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5FLM662160 KB76 KB (48%)✓3rd
https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.js119 KB48 KB (41%)✓3rd
https://www.scientificamerican.com/static/chunks/use-cart-DTnLA9u2.js2 KB—✓3rd
https://www.scientificamerican.com/sciads/sciads.js24 KB—✗3rd
https://www.scientificamerican.com/static/chunks/use-auth-CEBA_iny.js11 KB—✓3rd
https://www.scientificamerican.com/static/chunks/datalayer-BUxHYK4X.js1 KB—✓3rd
https://www.scientificamerican.com/static/chunks/use-user-C_02cgLh.js2 KB—✓3rd
https://www.scientificamerican.com/static/chunks/DefaultLayout-DCwTEK0T.js3 KB—✓3rd
https://www.scientificamerican.com/static/chunks/use-plan-BmlcyOG8.js1 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

B
Page Weight Budget
1.3 MB transferred, 90 requests
REVIEW
1.3 MB transferred, 90 requests
Info::
Page weighs 2.7 MB (1.3 MB transferred)
Warning::
JavaScript is 611 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 611 KB
Info::
Fonts are 215 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 215 KB
Info::
90 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
90 requests
0.26 g CO2 per page load
JavaScript 611.5 KiB 47%
Images 356.1 KiB 28%
Fonts 215.5 KiB 17%
HTML 67.9 KiB 5%
CSS 36.3 KiB 3%
Other 1.9 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Why this matters

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

Source: web.dev font loading

B
JS Execution Cost
682ms total JS execution
REVIEW
682ms total JS execution
Info::
https://www.scientificamerican.com/: 231ms CPU time
Info::
Unattributable: 125ms CPU time
Info::
https://www.scientificamerican.com/static/chunks/e...: 94ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5FL...: 94ms CPU time
Info::
https://www.scientificamerican.com/static/chunks/v...: 70ms CPU time
Warning::
Third-party scripts: 682ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 26% Style & Layout 25% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.scientificamerican.com/231ms8ms13ms3rd
Unattributable125ms3ms0ms3rd
https://www.scientificamerican.com/static/chunks/errorboundary-CJyx5mlo.js94ms45ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5FLM66294ms70ms17ms3rd
https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.js70ms68ms0ms3rd
https://www.scientificamerican.com/static/chunks/sciam-B4Xuwe4e.js69ms66ms0ms3rd
C
Page Weight Inventory
Action
90 resources · 1.3 MB · 206 KB savings available
REVIEW
90 resources · 1.3 MB · 206 KB savings available
Warning::
Page weight 266 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~206 KB of savings available
Warning::
89 third-party resources (100% of weight)
90 resources · 1.3 MiB · 89 third-party 266.4 KiB over 1MB target
JavaScript 47% · 611.5 KiB
Image 28% · 357.4 KiB
Font 17% · 215.5 KiB
Document 5% · 67.9 KiB
CSS 3% · 36.3 KiB
Other 0% · 1.8 KiB

~205.5 KiB of savings available

Remove unused JavaScript: 205.5 KiB
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
Image Optimization
25 images, 0 KB saveable
PASS
25 images, 0 KB saveable
Warning::
https://static.scientificamerican.com/dam/asset/ff... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.scientificamerican.com/dam/m/ff32f9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 356 KB
0 oversized -0 KB
1 legacy format
2 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

A+
Font Loading
5 fonts (215 KB)
PASS
5 fonts (215 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

215 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 945 ms LCP 1.2 shttps://www.scientificamerican.com/static/assets/GT-America-Standard-Regular-C7OkZNy_.woff2GT-America-Standard-Reg... https://www.scientificamerican.com/static/assets/GT-America-Standard-Regular-C7OkZNy_.woff2 — 57.7 KiB — 13 ms — font-display: swaphttps://www.scientificamerican.com/static/assets/GT-America-Standard-Bold-Gn4hHfn_.woff2GT-America-Standard-Bol... https://www.scientificamerican.com/static/assets/GT-America-Standard-Bold-Gn4hHfn_.woff2 — 61.2 KiB — 17 ms — font-display: swaphttps://www.scientificamerican.com/static/assets/Crimson%20Text-reg-BBt56E4f.woff2Crimson%20Text-reg-BBt5... https://www.scientificamerican.com/static/assets/Crimson%20Text-reg-BBt56E4f.woff2 — 16.5 KiB — 19 ms — font-display: swaphttps://www.scientificamerican.com/static/assets/Crimson%20Text-reg_it-s1By9Gv_.woff2Crimson%20Text-reg_it-s... https://www.scientificamerican.com/static/assets/Crimson%20Text-reg_it-s1By9Gv_.woff2 — 17.2 KiB — 15 ms — font-display: swaphttps://www.scientificamerican.com/static/assets/GT-America-Standard-Bold-Italic-g-lhaQmf.woff2GT-America-Standard-Bol... https://www.scientificamerican.com/static/assets/GT-America-Standard-Bold-Italic-g-lhaQmf.woff2 — 63.0 KiB — 21 ms — font-display: swap
GT-America-Standard-Reg... woff2 swap
Size 58 KB
Load time 13 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Bol... woff2 swap
Size 61 KB
Load time 17 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
Crimson%20Text-reg-BBt5... woff2 swap
Size 16 KB
Load time 19 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
Crimson%20Text-reg_it-s... woff2 swap
Size 17 KB
Load time 15 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Bol... woff2 swap
Size 63 KB
Load time 21 ms
Start 310 ms
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=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
Cache-Control header is set
Got: max-age=86400
Info::
Effective TTL: 1 day (max-age=86400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=86400

DirectiveValueMeaning
max-age86400Cache for 1 day
Effective TTL: 86400 seconds
Network Waterfall
90 requests over 794ms
INFO
0 ms 500 ms 1.0 s FCP 945 ms LCP 1.2 shttps://scientificamerican.com// https://scientificamerican.com/ — 301 — 574 B — 10 ms — h2https://www.scientificamerican.com/www.scientificamerican.com/ https://www.scientificamerican.com/ — 200 — 67.9 KiB — 24 ms — h2https://www.scientificamerican.com/static/bundle.D4myR-c2.jswww.scientificamerican.com/static/b... https://www.scientificamerican.com/static/bundle.D4myR-c2.js — 200 — 30.5 KiB — 43 ms — h2https://www.scientificamerican.com/static/chunks/preload-helper-MnokBkrb.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/preload-helper-MnokBkrb.js — 200 — 1.4 KiB — 51 ms — h2https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.js — 200 — 118.6 KiB — 145 ms — h2https://www.scientificamerican.com/static/chunks/sciam-B4Xuwe4e.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/sciam-B4Xuwe4e.js — 200 — 11.3 KiB — 100 ms — h2https://www.scientificamerican.com/static/chunks/errorboundary-CJyx5mlo.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/errorboundary-CJyx5mlo.js — 200 — 13.2 KiB — 74 ms — h2https://www.scientificamerican.com/static/chunks/use-auth-CEBA_iny.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-auth-CEBA_iny.js — 200 — 11.0 KiB — 113 ms — h2https://www.scientificamerican.com/static/chunks/datalayer-BUxHYK4X.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/datalayer-BUxHYK4X.js — 200 — 1.1 KiB — 118 ms — h2https://www.scientificamerican.com/static/chunks/use-user-C_02cgLh.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-user-C_02cgLh.js — 200 — 1.6 KiB — 79 ms — h2https://www.scientificamerican.com/static/chunks/use-chargebee-BC7jUIYG.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-chargebee-BC7jUIYG.js — 200 — 4.3 KiB — 73 ms — h2https://www.scientificamerican.com/static/chunks/use-plan-BmlcyOG8.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-plan-BmlcyOG8.js — 200 — 1.1 KiB — 75 ms — h2https://www.scientificamerican.com/static/chunks/use-cart-DTnLA9u2.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-cart-DTnLA9u2.js — 200 — 1.7 KiB — 119 ms — h2https://www.scientificamerican.com/static/chunks/use-consent-BXGXXq97.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-consent-BXGXXq97.js — 200 — 1.7 KiB — 121 ms — h2https://www.scientificamerican.com/static/chunks/tally-DbwAMvgb.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/tally-DbwAMvgb.js — 200 — 2.1 KiB — 135 ms — h2https://www.scientificamerican.com/static/chunks/use-count-DLTx8ng8.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-count-DLTx8ng8.js — 200 — 1.4 KiB — 51 ms — h2https://www.scientificamerican.com/static/chunks/utils-QDS1VHJ5.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/utils-QDS1VHJ5.js — 200 — 1.9 KiB — 101 ms — h2https://www.scientificamerican.com/static/chunks/provider-DWo_EWuS.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/provider-DWo_EWuS.js — 200 — 1004 B — 88 ms — h2https://www.scientificamerican.com/static/chunks/useOverlay-BlofETwt.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/useOverlay-BlofETwt.js — 200 — 928 B — 107 ms — h2https://www.scientificamerican.com/static/chunks/gtm-tjz2E76q.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/gtm-tjz2E76q.js — 200 — 2.2 KiB — 76 ms — h2https://www.scientificamerican.com/static/assets/bundle-Bu8EBeue.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/bundle-Bu8EBeue.css — 200 — 3.3 KiB — 40 ms — h2https://www.scientificamerican.com/static/assets/Input-C57946EV.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/Input-C57946EV.css — 200 — 1.6 KiB — 42 ms — h2https://www.scientificamerican.com/static/assets/DynamicLabelInput-DwXtCBSS.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/DynamicLabelInput-DwXtCBSS.css — 200 — 625 B — 91 ms — h2https://www.scientificamerican.com/static/assets/TalkIcon-CYQQg01-.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/TalkIcon-CYQQg01-.css — 200 — 910 B — 75 ms — h2https://www.scientificamerican.com/static/assets/ArticleList-CbosH0t6.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/ArticleList-CbosH0t6.css — 200 — 1.2 KiB — 69 ms — h2https://www.scientificamerican.com/static/assets/IssuePage-8lYoxDef.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/IssuePage-8lYoxDef.css — 200 — 2.5 KiB — 87 ms — h2https://www.scientificamerican.com/static/assets/Kicker-BuYKkL60.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/Kicker-BuYKkL60.css — 200 — 579 B — 79 ms — h2https://www.scientificamerican.com/static/assets/index--Rm_Dt2j.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/index--Rm_Dt2j.css — 200 — 11.7 KiB — 63 ms — h2https://www.scientificamerican.com/static/assets/ArticleDisplay-CkAgyHRP.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/ArticleDisplay-CkAgyHRP.css — 200 — 1.4 KiB — 51 ms — h2https://www.scientificamerican.com/static/assets/ExploreTopics-BfzsiatO.csswww.scientificamerican.com/static/a... https://www.scientificamerican.com/static/assets/ExploreTopics-BfzsiatO.css — 200 — 1.7 KiB — 31 ms — h2
0 ms 500 ms 1.0 s FCP 945 ms LCP 1.2 shttps://scientificamerican.com// https://scientificamerican.com/ — 301 — 574 B — 10 ms — h2https://www.scientificamerican.com/www.scientificamerican.com/ https://www.scientificamerican.com/ — 200 — 67.9 KiB — 24 ms — h2https://www.scientificamerican.com/static/bundle.D4myR-c2.jswww.scientificamerican.com/static/b... https://www.scientificamerican.com/static/bundle.D4myR-c2.js — 200 — 30.5 KiB — 43 ms — h2https://www.scientificamerican.com/static/chunks/preload-helper-MnokBkrb.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/preload-helper-MnokBkrb.js — 200 — 1.4 KiB — 51 ms — h2https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/vendor-react-Dqw-xFm4.js — 200 — 118.6 KiB — 145 ms — h2https://www.scientificamerican.com/static/chunks/sciam-B4Xuwe4e.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/sciam-B4Xuwe4e.js — 200 — 11.3 KiB — 100 ms — h2https://www.scientificamerican.com/static/chunks/errorboundary-CJyx5mlo.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/errorboundary-CJyx5mlo.js — 200 — 13.2 KiB — 74 ms — h2https://www.scientificamerican.com/static/chunks/use-auth-CEBA_iny.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-auth-CEBA_iny.js — 200 — 11.0 KiB — 113 ms — h2https://www.scientificamerican.com/static/chunks/datalayer-BUxHYK4X.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/datalayer-BUxHYK4X.js — 200 — 1.1 KiB — 118 ms — h2https://www.scientificamerican.com/static/chunks/use-user-C_02cgLh.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-user-C_02cgLh.js — 200 — 1.6 KiB — 79 ms — h2https://www.scientificamerican.com/static/chunks/use-chargebee-BC7jUIYG.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-chargebee-BC7jUIYG.js — 200 — 4.3 KiB — 73 ms — h2https://www.scientificamerican.com/static/chunks/use-plan-BmlcyOG8.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-plan-BmlcyOG8.js — 200 — 1.1 KiB — 75 ms — h2https://www.scientificamerican.com/static/chunks/use-cart-DTnLA9u2.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-cart-DTnLA9u2.js — 200 — 1.7 KiB — 119 ms — h2https://www.scientificamerican.com/static/chunks/use-consent-BXGXXq97.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-consent-BXGXXq97.js — 200 — 1.7 KiB — 121 ms — h2https://www.scientificamerican.com/static/chunks/tally-DbwAMvgb.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/tally-DbwAMvgb.js — 200 — 2.1 KiB — 135 ms — h2https://www.scientificamerican.com/static/chunks/use-count-DLTx8ng8.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/use-count-DLTx8ng8.js — 200 — 1.4 KiB — 51 ms — h2https://www.scientificamerican.com/static/chunks/utils-QDS1VHJ5.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/utils-QDS1VHJ5.js — 200 — 1.9 KiB — 101 ms — h2https://www.scientificamerican.com/static/chunks/provider-DWo_EWuS.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/provider-DWo_EWuS.js — 200 — 1004 B — 88 ms — h2https://www.scientificamerican.com/static/chunks/useOverlay-BlofETwt.jswww.scientificamerican.com/static/c... https://www.scientificamerican.com/static/chunks/useOverlay-BlofETwt.js — 200 — 928 B — 107 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 682ms · 371KB · €12/mo
www.scientificamerican.com
Other
Costly
Execution 231ms
Transfer 68 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 125ms
Transfer 0 KB
Monthly Cost €2/mo
www.scientificamerican.com
Other
Optional
Execution 94ms
Transfer 13 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 94ms
Transfer 160 KB
Unused 48%
Monthly Cost €2/mo
www.scientificamerican.com
Other
Optional
Execution 70ms
Transfer 119 KB
Unused 41%
Monthly Cost €1/mo
www.scientificamerican.com
Other
Optional
Execution 69ms
Transfer 11 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.scientificamerican.com adds 231ms and costs ~€4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.scientificamerican.com takes 231ms 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

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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