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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

1.50 s

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

2.11 s

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

50 ms

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

0.001

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

1.87 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.

3.30 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
3.1 MB transferred, 49 requests
FIX
3.1 MB transferred, 49 requests
Warning::
Page weighs 5.3 MB (3.1 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 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::
49 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
49 requests
0.66 g CO2 per page load
Images 2.1 MiB 66%
JavaScript 931.8 KiB 29%
Fonts 101.2 KiB 3%
CSS 36.4 KiB 1%
HTML 25.4 KiB 1%
Other 3.4 KiB 0%
Other 615 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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
11 scripts, 407 KB unused
FIX
11 scripts, 407 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PYD2...: 72 KB unused (46%)
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: 407 KB
407 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 (46%)✓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 KB42 KB (51%)✓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/3c221833-5f92-4fd6-89d8-587c7ca5cff3-0 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
49 resources · 3.1 MB · 407 KB savings available
FIX
49 resources · 3.1 MB · 407 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~407 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
2 resources over 200KB
49 resources · 3.1 MiB · 48 third-party 2.1 MiB over 1MB target
Image 66% · 2.1 MiB
JavaScript 29% · 931.8 KiB
Font 3% · 101.2 KiB
CSS 1% · 36.4 KiB
Document 1% · 25.7 KiB
Other 0% · 615 B

~406.9 KiB of savings available

Remove unused JavaScript: 406.9 KiB
B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 2.1 MB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1084ms total JS execution
REVIEW
1084ms total JS execution
Info::
https://www.mitre.org/: 192ms CPU time
Info::
https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3...: 188ms CPU time
Info::
https://www.mitre.org/sites/default/files/js/js_uB...: 131ms CPU time
Info::
Unattributable: 121ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-548...: 107ms CPU time
Warning::
Third-party scripts: 1084ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Style & Layout 17% Other 15% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.mitre.org/192ms5ms1ms3rd
https://cmp.osano.com/AzyhULTdPkqmy4aDN/f0e8e901-3feb-47c4-bd04-96df98c75dab/osano.js188ms128ms10ms3rd
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_xRuGCztoeI78s8g131ms75ms10ms3rd
Unattributable121ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-548FP3T107ms87ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FCNJHL96VJ&cx=c&gtm=4e64h193ms77ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MV8S3KQ86ms70ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h183ms67ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-V82LD37W12&cx=c&gtm=4e64h182ms66ms15ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.5 s LCP 2.1 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 — 17.4 KiB — 28 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 — 59 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 — 62 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 — 17.9 KiB — 66 ms — font-display: swaphttps://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_3vq_ROW4AJi8SJQt.woff2L0xuDF4xlVMF-BfR8bXMIhJ... https://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_3vq_ROW4AJi8SJQt.woff2 — 12.4 KiB — 9 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 — 61 ms — font-display: swap
94557603-6403-4571-a92e... woff2 swap
Size 17 KB
Load time 28 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
ee3d290f-f853-4ff3-913e... woff2 swap
Size 18 KB
Load time 59 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
dae937ec-159f-4710-9b2d... woff2 swap
Size 18 KB
Load time 62 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
135abd30-1390-4f9c-b6a2... woff2 swap
Size 18 KB
Load time 66 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
L0xuDF4xlVMF-BfR8bXMIhJ... woff2 swap
Size 12 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
b1979d94-a178-4b03-b43d... woff2 swap
Size 18 KB
Load time 61 ms
Start 1.1 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=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
49 requests over 2097ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.5 s LCP 2.1 shttps://mitre.org// https://mitre.org/ — 301 — 257 B — 613 ms — h2https://www.mitre.org/www.mitre.org/ https://www.mitre.org/ — 200 — 25.4 KiB — 178 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 — 27 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 — 676 B — 61 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 — 122 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 — 66 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 — 61 ms — h2https://www.mitre.org/sites/default/files/styles/hero/public/hero/2026-02/Beyond-Barriers-Web-Hero.jpg.webp?itok=4uPgqPJ4www.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/hero/public/hero/2026-02/Beyond-Barriers-Web-Hero.jpg.webp?itok=4uPgqPJ4 — 200 — 81.4 KiB — 76 ms — h2https://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/satellite-Bamboo-Eagle.jpg.webp?itok=oFDwNtQVwww.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/satellite-Bamboo-Eagle.jpg.webp?itok=oFDwNtQV — 200 — 126.1 KiB — 72 ms — h2blob:https://www.mitre.org/3c221833-5f92-4fd6-89d8-587c7ca5cff3www.mitre.org/3c221833-5f92-4fd6-89... blob:https://www.mitre.org/3c221833-5f92-4fd6-89d8-587c7ca5cff3 — 200 — -1 B — 34 ms — blobhttps://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/plane-interior-passengers.jpg.webp?itok=Hj4bJbQDwww.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/plane-interior-passengers.jpg.webp?itok=Hj4bJbQD — 200 — 108.8 KiB — 70 ms — h2https://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/Capito-hill-dome.jpg.webp?itok=jo6wRbb8www.mitre.org/sites/default/files/s... https://www.mitre.org/sites/default/files/styles/hero/public/hero/2025-04/Capito-hill-dome.jpg.webp?itok=jo6wRbb8 — 200 — 326.2 KiB — 167 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 — 669 B — 46 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 — 23 ms — 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h2https://www.googletagmanager.com/gtag/js?id=G-FCNJHL96VJ&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-FCNJHL96VJ&cx=c&gtm=4e64h1 — 200 — 151.0 KiB — 175 ms — h2https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-PYD2Z0G3XY&cx=c&gtm=4e64h1 — 200 — 155.6 KiB — 203 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 — 210 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 — 38 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 1084ms · 899KB · $14/mo
www.mitre.org
Other
Optional
Execution 192ms
Transfer 25 KB
Monthly Cost $3/mo
cmp.osano.com
Other
Optional
Execution 188ms
Transfer 77 KB
Unused 32%
Monthly Cost $2/mo
www.mitre.org
Other
Optional
Execution 131ms
Transfer 84 KB
Unused 51%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 121ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 107ms
Transfer 117 KB
Unused 56%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 151 KB
Unused 46%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 86ms
Transfer 132 KB
Unused 46%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 156 KB
Unused 46%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 157 KB
Unused 46%
Monthly Cost $1/mo

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

51% of www.mitre.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

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

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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