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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

4.57 s

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

8.51 s

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

1.20 s

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.

5.29 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.

14.68 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 48 requests
FIX
2.6 MB transferred, 48 requests
Warning::
Page weighs 4.8 MB (2.6 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 932 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 932 KB
Info::
48 HTTP requests
Info::
Estimated 0.56 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
48 requests
0.56 g CO2 per page load
Images 1.6 MiB 59%
JavaScript 931.9 KiB 34%
Fonts 101.3 KiB 4%
CSS 36.5 KiB 1%
HTML 25.4 KiB 1%
Other 3.4 KiB 0%
Other 623 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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4672ms total JS execution
FIX
4672ms total JS execution
Warning::
https://www.mitre.org/: 928ms CPU time
Warning::
https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3...: 740ms CPU time
Warning::
https://www.mitre.org/sites/default/files/js/js_uB...: 644ms CPU time
Warning::
Unattributable: 455ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FCNJ...: 394ms CPU time
Warning::
Third-party scripts: 4672ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 18% Other 16% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.mitre.org/928ms21ms4ms3rd
https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3feb-47c4-bd04-96df98c75dab/osano.js740ms507ms43ms3rd
https://www.mitre.org/sites/default/files/js/js_uB79mDFOfjdr-tBD-HAzCeLDl9GtNpPMMPU76h2-vCY.js?scope=footer&delta=0&language=en&theme=mitre&include=eJxVyFEOgCAIANALaRzJkWJjkTSk5vHbyp8-38sqaqsO4MYe8lQSxQI_BRou3HYodp0oy2Q42I1gE11RPqSOQr2qZYI3Yq_xRuGCztoeI78s8g644ms384ms36ms3rd
Unattributable455ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FCNJHL96VJ&cx=c&gtm=4e64h1394ms318ms67ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h1386ms288ms57ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-548FP3T383ms332ms45ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MV8S3KQ373ms279ms52ms3rd
https://www.googletagmanager.com/gtag/js?id=G-V82LD37W12&cx=c&gtm=4e64h1369ms303ms63ms3rd
D
JS Bundles
Action
11 scripts, 405 KB unused
FIX
11 scripts, 405 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PYD2...: 72 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-V82L...: 72 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FCNJ...: 69 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-548...: 66 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MV8...: 61 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 405 KB
405 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h1156 KB72 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-V82LD37W12&cx=c&gtm=4e64h1157 KB72 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-FCNJHL96VJ&cx=c&gtm=4e64h1151 KB69 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-548FP3T117 KB66 KB (56%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MV8S3KQ132 KB61 KB (46%)✓3rd
https://www.mitre.org/sites/default/files/js/js_uB79mDFOfjdr-tBD-HAzCeLDl9GtNpPMMPU76h2-vCY.js?scope=footer&delta=0&language=en&theme=mitre&include=eJxVyFEOgCAIANALaRzJkWJjkTSk5vHbyp8-38sqaqsO4MYe8lQSxQI_BRou3HYodp0oy2Q42I1gE11RPqSOQr2qZYI3Yq_xRuGCztoeI78s8g84 KB41 KB (50%)✓3rd
https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3feb-47c4-bd04-96df98c75dab/osano.js77 KB24 KB (32%)✓3rd
https://www.mitre.org/sites/default/files/google_tag/analytics_container/google_tag.script.js?tdrpwi1 KB—✓3rd
blob:https://www.mitre.org/73d6fdb4-a251-4f0e-8bc5-169ef5666226-0 KB—✓3rd
https://s.go-mpulse.net/boomerang/FASQB-HBHXE-EUS9Q-7LJEZ-3FKTW57 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
48 resources · 2.6 MB · 405 KB savings available
FIX
48 resources · 2.6 MB · 405 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~405 KB of savings available
Warning::
47 third-party resources (100% of weight)
48 resources · 2.6 MiB · 47 third-party 1.6 MiB over 1MB target
Image 60% · 1.6 MiB
JavaScript 34% · 931.9 KiB
Font 4% · 101.3 KiB
CSS 1% · 36.5 KiB
Document 1% · 25.7 KiB
Other 0% · 623 B

~405.4 KiB of savings available

Remove unused JavaScript: 405.4 KiB
B
Image Optimization
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 1.6 MB
0 oversized -0 KB
23 legacy format
0 missing dimensions CLS risk
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
6 fonts (101 KB)
PASS
6 fonts (101 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

101 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.6 s LCP 8.5 shttps://www.mitre.org/themes/mitre/fonts/5730901/94557603-6403-4571-a92e-e7dfa6bb6375.woff294557603-6403-4571-a92e... https://www.mitre.org/themes/mitre/fonts/5730901/94557603-6403-4571-a92e-e7dfa6bb6375.woff2 — 17.5 KiB — 46 ms — font-display: swaphttps://www.mitre.org/themes/mitre/fonts/5730950/dae937ec-159f-4710-9b2d-9470e24807ba.woff2dae937ec-159f-4710-9b2d... https://www.mitre.org/themes/mitre/fonts/5730950/dae937ec-159f-4710-9b2d-9470e24807ba.woff2 — 17.8 KiB — 57 ms — font-display: swaphttps://www.mitre.org/themes/mitre/fonts/5730936/ee3d290f-f853-4ff3-913e-7bae693a43ec.woff2ee3d290f-f853-4ff3-913e... https://www.mitre.org/themes/mitre/fonts/5730936/ee3d290f-f853-4ff3-913e-7bae693a43ec.woff2 — 17.7 KiB — 27 ms — font-display: swaphttps://www.mitre.org/themes/mitre/fonts/5730921/135abd30-1390-4f9c-b6a2-d843157c3468.woff2135abd30-1390-4f9c-b6a2... https://www.mitre.org/themes/mitre/fonts/5730921/135abd30-1390-4f9c-b6a2-d843157c3468.woff2 — 18.0 KiB — 57 ms — font-display: swaphttps://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_3vq_ROW4AJ68SA.woff2L0xuDF4xlVMF-BfR8bXMIhJ... https://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_3vq_ROW4AJ68SA.woff2 — 12.4 KiB — 6 ms — font-display: swaphttps://www.mitre.org/themes/mitre/fonts/5730909/b1979d94-a178-4b03-b43d-c8e46562f107.woff2b1979d94-a178-4b03-b43d... https://www.mitre.org/themes/mitre/fonts/5730909/b1979d94-a178-4b03-b43d-c8e46562f107.woff2 — 18.0 KiB — 46 ms — font-display: swap
94557603-6403-4571-a92e... woff2 swap
Size 17 KB
Load time 46 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
dae937ec-159f-4710-9b2d... woff2 swap
Size 18 KB
Load time 57 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ee3d290f-f853-4ff3-913e... woff2 swap
Size 18 KB
Load time 27 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
135abd30-1390-4f9c-b6a2... woff2 swap
Size 18 KB
Load time 57 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
L0xuDF4xlVMF-BfR8bXMIhJ... woff2 swap
Size 12 KB
Load time 6 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
b1979d94-a178-4b03-b43d... woff2 swap
Size 18 KB
Load time 46 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
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
HTTP Caching
max-age=1209600 (2 weeks)
PASS
max-age=1209600 (2 weeks)
Info::
Cache-Control header is set
Got: max-age=1209600
Info::
Effective TTL: 2 weeks (max-age=1209600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=1209600

DirectiveValueMeaning
max-age1209600Cache for 2 weeks
Effective TTL: 1209600 seconds
Network Waterfall
48 requests over 2615ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.6 s LCP 8.5 shttps://mitre.org// https://mitre.org/ — 301 — 257 B — 503 ms — h2https://www.mitre.org/www.mitre.org/ https://www.mitre.org/ — 200 — 25.4 KiB — 730 ms — h2https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3feb-47c4-bd04-96df98c75dab/osano.jscmp.osano.com/AzyhULTdPkqmy4aDN/f0e... https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3feb-47c4-bd04-96df98c75dab/osano.js — 200 — 76.9 KiB — 30 ms — h3https://www.mitre.org/sites/default/files/google_tag/analytics_container/google_tag.script.js?tdrpwiwww.mitre.org/sites/default/files/g... https://www.mitre.org/sites/default/files/google_tag/analytics_container/google_tag.script.js?tdrpwi — 200 — 699 B — 54 ms — h2https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swap — 200 — 1.1 KiB — 119 ms — h2https://www.mitre.org/sites/default/files/css/css_SFiXTIMhGxZuzcOQV1HGSf4eOAQxwLo9lS3FrA4nBJs.css?delta=0&language=en&theme=mitre&include=eJxVjlEOwyAMQy8E5WMHmgJEFDUQRMLW3n5TaTXtx_KzpcSBQORwHgRNmL6gCCQUE5i4e94d7lAa4cPgrpTr5mIfDWi50JSsHV0i9kATnoGrYlUXNosxK3cretD36H99kr3IQiy5mgYdUoe2yv3nlyyjtuEpy4rRyCGKZW5_ZXyLO3UpHAfhB1iUVTIwww.mitre.org/sites/default/files/c... https://www.mitre.org/sites/default/files/css/css_SFiXTIMhGxZuzcOQV1HGSf4eOAQxwLo9lS3FrA4nBJs.css?delta=0&language=en&theme=mitre&include=eJxVjlEOwyAMQy8E5WMHmgJEFDUQRMLW3n5TaTXtx_KzpcSBQORwHgRNmL6gCCQUE5i4e94d7lAa4cPgrpTr5mIfDWi50JSsHV0i9kATnoGrYlUXNosxK3cretD36H99kr3IQiy5mgYdUoe2yv3nlyyjtuEpy4rRyCGKZW5_ZXyLO3UpHAfhB1iUVTI — 200 — 3.0 KiB — 48 ms — h2https://www.mitre.org/sites/default/files/css/css_TVxUnvsfKdSFrwrPEES13rbCzAu3GDSqXvPTSN4Jsbc.css?delta=1&language=en&theme=mitre&include=eJxVjlEOwyAMQy8E5WMHmgJEFDUQRMLW3n5TaTXtx_KzpcSBQORwHgRNmL6gCCQUE5i4e94d7lAa4cPgrpTr5mIfDWi50JSsHV0i9kATnoGrYlUXNosxK3cretD36H99kr3IQiy5mgYdUoe2yv3nlyyjtuEpy4rRyCGKZW5_ZXyLO3UpHAfhB1iUVTIwww.mitre.org/sites/default/files/c... https://www.mitre.org/sites/default/files/css/css_TVxUnvsfKdSFrwrPEES13rbCzAu3GDSqXvPTSN4Jsbc.css?delta=1&language=en&theme=mitre&include=eJxVjlEOwyAMQy8E5WMHmgJEFDUQRMLW3n5TaTXtx_KzpcSBQORwHgRNmL6gCCQUE5i4e94d7lAa4cPgrpTr5mIfDWi50JSsHV0i9kATnoGrYlUXNosxK3cretD36H99kr3IQiy5mgYdUoe2yv3nlyyjtuEpy4rRyCGKZW5_ZXyLO3UpHAfhB1iUVTI — 200 — 31.7 KiB — 45 ms — h2https://www.mitre.org/sites/default/files/styles/hero_mobile/public/hero/2026-02/Beyond-Barriers-Web-Hero.jpg.jpg?itok=vNZ6_RBCwww.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/hero_mobile/public/hero/2026-02/Beyond-Barriers-Web-Hero.jpg.jpg?itok=vNZ6_RBC — 200 — 82.8 KiB — 61 ms — h2https://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/satellite-Bamboo-Eagle.jpg.jpeg?itok=KC5vcXt3www.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/satellite-Bamboo-Eagle.jpg.jpeg?itok=KC5vcXt3 — 200 — 89.8 KiB — 50 ms — h2blob:https://www.mitre.org/73d6fdb4-a251-4f0e-8bc5-169ef5666226www.mitre.org/73d6fdb4-a251-4f0e-8b... blob:https://www.mitre.org/73d6fdb4-a251-4f0e-8bc5-169ef5666226 — 200 — -1 B — 33 ms — blobhttps://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/plane-interior-passengers.jpg.jpeg?itok=yLAbquJUwww.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/plane-interior-passengers.jpg.jpeg?itok=yLAbquJU — 200 — 97.1 KiB — 137 ms — h2https://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/Capito-hill-dome.jpg.jpeg?itok=GwFCLRYawww.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/pod/public/hero/2025-04/Capito-hill-dome.jpg.jpeg?itok=GwFCLRYa — 200 — 158.8 KiB — 121 ms — h2https://fast.fonts.net/lt/1.css?apiType=da&c=ca0e9577-b3c7-4964-b025-98f0d83161a6&fontids=5729813,5729814,5730901,5730905,5730909,5730913,5730917,5730921,5730925,5730932,5730936,5730943,5730950,5730957fast.fonts.net/lt/1.css?apiType=da&... https://fast.fonts.net/lt/1.css?apiType=da&c=ca0e9577-b3c7-4964-b025-98f0d83161a6&fontids=5729813,5729814,5730901,5730905,5730909,5730913,5730917,5730921,5730925,5730932,5730936,5730943,5730950,5730957 — 200 — 670 B — 43 ms — h2https://s.go-mpulse.net/boomerang/FASQB-HBHXE-EUS9Q-7LJEZ-3FKTWs.go-mpulse.net/boomerang/FASQB-HBH... https://s.go-mpulse.net/boomerang/FASQB-HBHXE-EUS9Q-7LJEZ-3FKTW — 200 — 56.9 KiB — 19 ms — 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https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h1 — 200 — 155.6 KiB — 229 ms — h2https://www.googletagmanager.com/gtag/js?id=G-V82LD37W12&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-V82LD37W12&cx=c&gtm=4e64h1 — 200 — 157.1 KiB — 205 ms — h2https://www.mitre.org/themes/mitre/img/favicons/favicon.icowww.mitre.org/themes/mitre/img/favi... https://www.mitre.org/themes/mitre/img/favicons/favicon.ico — 200 — 3.2 KiB — 28 ms — h2
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 4672ms · 899KB · $62/mo
www.mitre.org
Other
Costly
Execution 928ms
Transfer 25 KB
Monthly Cost $12/mo
cmp.osano.com
Other
Costly
Execution 740ms
Transfer 77 KB
Unused 32%
Monthly Cost $10/mo
www.mitre.org
Other
Costly
Execution 644ms
Transfer 84 KB
Unused 50%
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 455ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 394ms
Transfer 151 KB
Unused 46%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 386ms
Transfer 156 KB
Unused 47%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 383ms
Transfer 117 KB
Unused 56%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 373ms
Transfer 132 KB
Unused 46%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 369ms
Transfer 157 KB
Unused 46%
Monthly Cost $5/mo

These scripts may cost more than they're worth

  • www.mitre.org adds 928ms and costs ~$12/month
  • cmp.osano.com adds 740ms and costs ~$10/month
  • www.mitre.org adds 644ms and costs ~$9/month
  • Unattributable adds 455ms and costs ~$6/month
  • Google Tag Manager adds 394ms and costs ~$5/month
  • Google Tag Manager adds 386ms and costs ~$5/month
  • Google Tag Manager adds 383ms and costs ~$5/month
  • Google Tag Manager adds 373ms and costs ~$5/month
  • Google Tag Manager adds 369ms and costs ~$5/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.mitre.org takes 928ms 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

cmp.osano.com takes 740ms 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.mitre.org takes 644ms 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 455ms 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 394ms 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 386ms 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 383ms 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

56% of Google Tag Manager'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 373ms 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 369ms 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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