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https://osha.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
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.

2.88 s

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

3.83 s

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

0 ms

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

0.194

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

2.88 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.

3.83 s

Page Load Progression

421 ms
842 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.4 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 57 requests
FIX
5.8 MB transferred, 57 requests
Critical::
Page weighs 7.1 MB (5.8 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Info::
CSS is 2.2 MB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 2.2 MB
Warning::
JavaScript is 840 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 840 KB
Info::
Fonts are 229 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 229 KB
Info::
57 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
57 requests
1.2 g CO2 per page load
Images 2.5 MiB 43%
CSS 2.2 MiB 37%
JavaScript 839.9 KiB 14%
Fonts 228.7 KiB 4%
HTML 112.5 KiB 2%
Other 3.0 KiB 0%
Other 1.1 KiB 0%
Other 547 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

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

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 (5.8 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
16 scripts, 407 KB unused
FIX
16 scripts, 407 KB unused
Warning::
https://www.osha.gov/sites/default/files/js/js_rxz...: 127 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://translate.googleapis.com/_/translate_http/...: 94 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-THXL...: 66 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 59 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.osha.gov/sites/default/files/js/js_N5u...: 41 KB unused (44%)
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.osha.gov/sites/default/files/js/js_rxzBJLnQagbBgkRS7C9ebxoMYkv9OEpwI9paccWIkfI.js?scope=footer&delta=2&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd187 KB127 KB (68%)✓3rd
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy56E.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfr19FYIaQWCvBYtl2_gp8OxhpIGyQ/m=el_main119 KB94 KB (79%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-THXLXTHVBH&cx=c&gtm=4e64h1160 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB59 KB (40%)✓3rd
https://www.osha.gov/sites/default/files/js/js_N5uaCXC7dq6cXNidVU_JTP3hTSqCP-vKV0CrtmvkgPc.js?scope=footer&delta=0&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd93 KB41 KB (44%)✓3rd
https://www.osha.gov/sites/default/files/js/js_7b0hq7-t7jQvo27Hspv-udNd8FXxVEQ50q2Inf2c5U4.js?scope=footer&delta=6&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd41 KB20 KB (49%)✓3rd
https://www.osha.gov/sites/default/files/js/js_rnXnVRCjGNUAOaHxTxAiWk_V2uRLAMh9eUQRMlNGqho.js?scope=footer&delta=4&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd1 KB—✓3rd
https://www.osha.gov/modules/contrib/ckeditor_accordion/js/accordion.frontend.min.js?tdo6v04 KB—✓3rd
https://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit228 KB—✓3rd
https://siteimproveanalytics.com/js/siteanalyze_6313124.js15 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
57 resources · 5.8 MB · 407 KB savings available
FIX
57 resources · 5.8 MB · 407 KB savings available
Warning::
Page weight 4.8 MB over 1MB target
Got: 5.8 MB Expected: ≤ 1 MB
Info::
~407 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
5 resources over 200KB
57 resources · 5.8 MiB · 56 third-party 4.8 MiB over 1MB target
Image 43% · 2.5 MiB
CSS 37% · 2.2 MiB
JavaScript 14% · 839.9 KiB
Font 4% · 228.7 KiB
Document 2% · 112.5 KiB
Other 0% · 1.9 KiB

~406.7 KiB of savings available

Remove unused JavaScript: 406.7 KiB
C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://www.osha.gov/sites/default/files/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.osha.gov/sites/default/files/OSHA-is-H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.osha.gov/themes/contrib/ddp_dol_theme/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 2.5 MB
0 oversized -0 KB
17 legacy format
3 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

B
JS Execution Cost
937ms total JS execution
REVIEW
937ms total JS execution
Warning::
https://www.osha.gov/: 352ms CPU time
Info::
https://translate.googleapis.com/_/translate_http/...: 217ms CPU time
Info::
Unattributable: 102ms CPU time
Info::
https://www.osha.gov/sites/default/files/js/js_N5u...: 91ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 88ms CPU time
Warning::
Third-party scripts: 937ms (100% of total)

Main Thread Breakdown

Other 37% Script Evaluation 30% Style & Layout 16% Parse HTML & CSS 7% Script Parsing & Compilation 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.osha.gov/352ms5ms1ms3rd
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy56E.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfr19FYIaQWCvBYtl2_gp8OxhpIGyQ/m=el_main217ms47ms13ms3rd
Unattributable102ms3ms0ms3rd
https://www.osha.gov/sites/default/files/js/js_N5uaCXC7dq6cXNidVU_JTP3hTSqCP-vKV0CrtmvkgPc.js?scope=footer&delta=0&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd91ms64ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L88ms73ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-THXLXTHVBH&cx=c&gtm=4e64h187ms70ms15ms3rd
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 (229 KB)
PASS
6 fonts (229 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

229 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 FCP 2.9 s LCP 3.8 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 17 ms — font-display: swaphttps://www.osha.gov/themes/contrib/ddp_dol_theme/build/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.osha.gov/themes/contrib/ddp_dol_theme/build/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.5 KiB — 12 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 18 ms — font-display: swaphttps://www.osha.gov/themes/contrib/ddp_dol_theme/build/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.osha.gov/themes/contrib/ddp_dol_theme/build/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.3 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2u-4e0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2 — 95.4 KiB — 18 ms — font-display: swaphttps://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/fonts/fontawesome-webfont.woff2?v=4.4.0fontawesome-webfont.woff2 https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/fonts/fontawesome-webfont.woff2?v=4.4.0 — 63.6 KiB — 20 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 17 ms
Start 256 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-regular-w... woff2 swap
Size 21 KB
Load time 12 ms
Start 256 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 18 ms
Start 256 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 18 ms
Start 257 ms
Risk FOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5... woff2 swap
Size 95 KB
Load time 18 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 64 KB
Load time 20 ms
Start 382 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=1800 (30 minutes)
PASS
max-age=1800 (30 minutes)
Info::
Cache-Control header is set
Got: public, max-age=1800
Info::
Effective TTL: 30 minutes (max-age=1800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=1800

DirectiveValueMeaning
public—Any cache may store this response
max-age1800Cache for 30 minutes
Effective TTL: 1800 seconds
Network Waterfall
57 requests over 1065ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.9 s LCP 3.8 shttps://osha.gov// https://osha.gov/ — 301 — 322 B — 16 ms — h2https://www.osha.gov/www.osha.gov/ https://www.osha.gov/ — 200 — 112.5 KiB — 21 ms — h2https://fonts.googleapis.com/css?family=Merriweatherfonts.googleapis.com/css?family=Mer... https://fonts.googleapis.com/css?family=Merriweather — 200 — 1.1 KiB — 52 ms — h2https://fonts.googleapis.com/css?family=Source+Sans+Profonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source+Sans+Pro — 200 — 726 B — 53 ms — h2https://fonts.googleapis.com/css?family=Robotofonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto — 200 — 1.6 KiB — 54 ms — h2https://www.osha.gov/sites/default/files/css/css_C8ngkdeOQ91SKaAyhEvReiyUNBFe06di0GebsqgvtQ4.css?delta=3&language=en&theme=osha&include=eJxtjluOwzAIRTfkxEuyiCGxVWIsIE27-7pRZ0Ya9QfBQfeRb4TVRRPkLIpVWvzd5lWlOTUMiD2hcPJCO8WNZQGezJ9c2xbGIy4ibq7Qp4ztIuuQTnCSyU4X-KKyihro4QPcIurRgefPGdbKThozdB9VgliB_xZvlkZXSmWEdNgoDjVpA36nW-igsI1SxX7c_8h8tH4sXK0QBnua0x4XMAr3SqfFa8674MH0AhLMcf4www.osha.gov/sites/default/files/cs... https://www.osha.gov/sites/default/files/css/css_C8ngkdeOQ91SKaAyhEvReiyUNBFe06di0GebsqgvtQ4.css?delta=3&language=en&theme=osha&include=eJxtjluOwzAIRTfkxEuyiCGxVWIsIE27-7pRZ0Ya9QfBQfeRb4TVRRPkLIpVWvzd5lWlOTUMiD2hcPJCO8WNZQGezJ9c2xbGIy4ibq7Qp4ztIuuQTnCSyU4X-KKyihro4QPcIurRgefPGdbKThozdB9VgliB_xZvlkZXSmWEdNgoDjVpA36nW-igsI1SxX7c_8h8tH4sXK0QBnua0x4XMAr3SqfFa8674MH0AhLMcf4 — 200 — 7.7 KiB — 35 ms — 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https://analytics.google.com/g/collect?v=2&tid=G-THXLXTHVBH&gtm=45je64h1v9108112373za200zb9131934939zd9131934939&_p=1776800992432&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&ecid=1302589440&_eu=AAAAAGA&are=1&cid=1653699767.1776800993&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117384405~117512543&dl=https%3A%2F%2Fosha.gov%2F&dt=Home%20%7C%20Occupational%20Safety%20and%20Health%20Administration&dr=&sid=1776800992&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1020 — 204 — 547 B — 36 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-THXLXTHVBH&cid=1653699767.1776800993&gtm=45je64h1v9108112373za200zb9131934939zd9131934939&rcb=19&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938465~115938468~117266401~117384405~117512543stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-THXLXTHVBH&cid=1653699767.1776800993&gtm=45je64h1v9108112373za200zb9131934939zd9131934939&rcb=19&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938465~115938468~117266401~117384405~117512543 — 204 — 547 B — 39 ms — h2https://www.osha.gov/sites/default/themes/custom/osha/favicon.icowww.osha.gov/sites/default/themes/c... https://www.osha.gov/sites/default/themes/custom/osha/favicon.ico — 200 — 2.6 KiB — 8 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 937ms · 631KB · $12/mo
www.osha.gov
Other
Costly
Execution 352ms
Transfer 112 KB
Monthly Cost $5/mo
translate.googleapis.com
Other
Costly
Execution 217ms
Transfer 119 KB
Unused 79%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 102ms
Transfer 0 KB
Monthly Cost $1/mo
www.osha.gov
Other
Optional
Execution 91ms
Transfer 93 KB
Unused 44%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 147 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 160 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.osha.gov adds 352ms and costs ~$5/month
  • translate.googleapis.com adds 217ms 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.osha.gov takes 352ms 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

translate.googleapis.com takes 217ms 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

79% of translate.googleapis.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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