Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
15.81 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
27.51 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
610 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.012
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
15.81 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.
27.61 s
Page Load Progression
FPage Weight BudgetAction5.8 MB transferred, 56 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3080ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.osha.gov/ | 701ms | 20ms | 4ms | 3rd |
| 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_nYkY2KsE38ifgT2Zd | 441ms | 58ms | 23ms | 3rd |
| Unattributable | 426ms | 9ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 365ms | 264ms | 88ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-THXLXTHVBH&cx=c>m=4e64h1 | 304ms | 243ms | 59ms | 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_nYkY2KsE38ifgT2Zd | 283ms | 197ms | 11ms | 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_main | 237ms | 169ms | 52ms | 3rd |
| https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js | 117ms | 112ms | 2ms | 3rd |
| https://www.osha.gov/sites/default/files/css/css_CqWlq2Olkr9xvaq7qmYVbR6-R3nOhlwUSrKAD16H6Rs.css?delta=9&language=en&theme=osha&include=eJxtjluOwzAIRTfkxEuyiCGxVWIsIE27-7pRZ0Ya9QfBQfeRb4TVRRPkLIpVWvzd5lWlOTUMiD2hcPJCO8WNZQGezJ9c2xbGIy4ibq7Qp4ztIuuQTnCSyU4X-KKyihro4QPcIurRgefPGdbKThozdB9VgliB_xZvlkZXSmWEdNgoDjVpA36nW-igsI1SxX7c_8h8tH4sXK0QBnua0x4XMAr3SqfFa8674MH0AhLMcf4 | 105ms | 0ms | 0ms | 3rd |
| https://www.osha.gov/sites/default/files/css/css_VHFSSqtIg7OyP4OWp19i0KN5BdeoqnEU39KX9HMtnr4.css?delta=4&language=en&theme=osha&include=eJxtjluOwzAIRTfkxEuyiCGxVWIsIE27-7pRZ0Ya9QfBQfeRb4TVRRPkLIpVWvzd5lWlOTUMiD2hcPJCO8WNZQGezJ9c2xbGIy4ibq7Qp4ztIuuQTnCSyU4X-KKyihro4QPcIurRgefPGdbKThozdB9VgliB_xZvlkZXSmWEdNgoDjVpA36nW-igsI1SxX7c_8h8tH4sXK0QBnua0x4XMAr3SqfFa8674MH0AhLMcf4 | 102ms | 0ms | 0ms | 3rd |
DJS BundlesAction16 scripts, 406 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| 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_nYkY2KsE38ifgT2Zd | 187 KB | 127 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_main | 119 KB | 94 KB (79%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-THXLXTHVBH&cx=c>m=4e64h1 | 160 KB | 66 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 147 KB | 59 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_nYkY2KsE38ifgT2Zd | 93 KB | 40 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_nYkY2KsE38ifgT2Zd | 41 KB | 20 KB (49%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/jquery.marquee@1.6.0/jquery.marquee.min.js | 3 KB | — | ✓ | 3rd |
| https://siteimproveanalytics.com/js/siteanalyze_6313124.js | 15 KB | — | ✓ | 3rd |
| https://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit2 | 28 KB | — | ✓ | 3rd |
| https://www.osha.gov/sites/default/files/js/js_18VPz1qKxGN6bMoFYukzUr1j3WJtUmaRRKcDu6_APLA.js?scope=footer&delta=8&language=en&theme=osha&include=eJxtjlkOwjAMRC_Ukotwh8jEJrHqxpHtIrg9YRFf_M3ypJmyEXKoZShFDVl7-qnT1bQHdVwQR0aVHI12SlX0ArJ6PIR7XWaRLqrhYTDWgv2d_IGc0Ra6xwy2hHYMkNPXLuoNUjk8dH_rPD9QbrrTgEqJehX2lskH9NcRrVXoH3mFAOFg8uzFVITsgzWSQZb2SZ_nYkY2KsE38ifgT2Zd | 2 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction56 resources · 5.8 MB · 406 KB savings availableFIX
~405.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 56 resources | 5.8 MiB | ||||||
CImage OptimizationAction16 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (229 KB)PASS
Web fonts
6
229 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=1800 (30 minutes)PASS
public, max-age=1800
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 1800 | Cache for 30 minutes |
Network Waterfall56 requests over 1350msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.osha.gov www.osha.gov | Other | 701ms | 112 KB | — | $9/mo | Costly |
www.osha.gov www.osha.gov | Other | 441ms | 187 KB | 68% | $6/mo | Costly |
Unattributable Unattributable | Other | 426ms | 0 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 365ms | 147 KB | 40% | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 304ms | 160 KB | 41% | $4/mo | Costly |
www.osha.gov www.osha.gov | Other | 283ms | 93 KB | 44% | $4/mo | Costly |
translate.googleapis.com translate.googleapis.com | Other | 237ms | 119 KB | 79% | $3/mo | Costly |
dap.digitalgov.gov dap.digitalgov.gov | Other | 117ms | 4 KB | — | $2/mo | Optional |
www.osha.gov www.osha.gov | Other | 105ms | 1058 KB | — | $1/mo | Optional |
www.osha.gov www.osha.gov | Other | 102ms | 1077 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.osha.gov adds 701ms and costs ~$9/month
- www.osha.gov adds 441ms and costs ~$6/month
- Unattributable adds 426ms and costs ~$6/month
- Google Tag Manager adds 365ms and costs ~$5/month
- Google Tag Manager adds 304ms and costs ~$4/month
- www.osha.gov adds 283ms and costs ~$4/month
- translate.googleapis.com adds 237ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 701ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.osha.gov takes 441ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
68% of www.osha.gov's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Unattributable takes 426ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 365ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 304ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.osha.gov takes 283ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
translate.googleapis.com takes 237ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev