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.
3.68 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
630 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.010
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.66 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.
9.40 s
Page Load Progression
FPage Weight BudgetAction3.6 MB transferred, 57 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
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2835ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 620ms | 20ms | 0ms | 3rd |
| https://www.ed.gov/sites/ed/files/js/js_fX8zlc3RraPD6JwRP_LnFmKfdZK5L2C0I0S7dMpUnKM.js?scope=footer&delta=0&language=en&theme=edgov&include=eJx1kVFyhDAIhi-k5kgOJqgZSciEpNaevjFmu7u1fWGAD5gfkEMSOjWBYJdlNzKerpojONw5bh2ahT_UQjwBdfiZyPpNmZgD0NDC7sPiLqrawbHJhF2ACEuEsMqj-JkZsg95IisrmjY_2mli3-sE_U9dNxF8Hara5hODaW5gOmZL1EJNIFJGpgeO7GzZ6YoizM3bcQpdKdSbqnbQIm9xWtHhW8aB9cOciXZr0toEo-k1RM6C9KL4zjT7hD41ItYFwpOaW9crW4AI49GIdbBgTzinXwe6cIgo0kckLJ_rPRtsYEZIOZ5qLhF_CV3ZlZ7yuH4i1ps0knYuXZSdl1tXVXhpShxu2KGxUNe4txJ4Y_1S8ktTKghRryMEO0JOrPk8QkL1T77MGVekgLGKr16bfW5yzu3EJiyvwhHKDZOy3j7Pf5G-kmvjb_GTJ0k | 500ms | 320ms | 61ms | 3rd |
| https://www.ed.gov/ | 477ms | 15ms | 2ms | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 378ms | 212ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 325ms | 270ms | 40ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TTBYENS3X0&cx=c>m=4e64h1 | 243ms | 202ms | 39ms | 3rd |
| https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js | 115ms | 111ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TTBYENS3X0 | 104ms | 33ms | 71ms | 3rd |
| https://www.ed.gov/sites/ed/files/css/css_QuAOjfZ3TyBbpQHXoYYYXkINWr3c-Tn-eLxHlAPVEMc.css?delta=1&language=en&theme=edgov&include=eJx1kVFyhDAIhi-k5kgOJqgZSciEpNaevjFmu7u1fWGAD5gfkEMSOjWBYJdlNzKerpojONw5bh2ahT_UQjwBdfiZyPpNmZgD0NDC7sPiLqrawbHJhF2ACEuEsMqj-JkZsg95IisrmjY_2mli3-sE_U9dNxF8Hara5hODaW5gOmZL1EJNIFJGpgeO7GzZ6YoizM3bcQpdKdSbqnbQIm9xWtHhW8aB9cOciXZr0toEo-k1RM6C9KL4zjT7hD41ItYFwpOaW9crW4AI49GIdbBgTzinXwe6cIgo0kckLJ_rPRtsYEZIOZ5qLhF_CV3ZlZ7yuH4i1ps0knYuXZSdl1tXVXhpShxu2KGxUNe4txJ4Y_1S8ktTKghRryMEO0JOrPk8QkL1T77MGVekgLGKr16bfW5yzu3EJiyvwhHKDZOy3j7Pf5G-kmvjb_GTJ0k | 73ms | 0ms | 0ms | 3rd |
DPage Weight InventoryAction57 resources · 3.6 MB · 286 KB savings availableFIX
~285.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 57 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction31 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
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
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
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
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
CJS BundlesAction8 scripts, 286 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-TTBYENS3X0 | 153 KB | 105 KB (69%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TTBYENS3X0&cx=c>m=4e64h1 | 153 KB | 62 KB (40%) | ✓ | 3rd |
| https://www.ed.gov/sites/ed/files/js/js_fX8zlc3RraPD6JwRP_LnFmKfdZK5L2C0I0S7dMpUnKM.js?scope=footer&delta=0&language=en&theme=edgov&include=eJx1kVFyhDAIhi-k5kgOJqgZSciEpNaevjFmu7u1fWGAD5gfkEMSOjWBYJdlNzKerpojONw5bh2ahT_UQjwBdfiZyPpNmZgD0NDC7sPiLqrawbHJhF2ACEuEsMqj-JkZsg95IisrmjY_2mli3-sE_U9dNxF8Hara5hODaW5gOmZL1EJNIFJGpgeO7GzZ6YoizM3bcQpdKdSbqnbQIm9xWtHhW8aB9cOciXZr0toEo-k1RM6C9KL4zjT7hD41ItYFwpOaW9crW4AI49GIdbBgTzinXwe6cIgo0kckLJ_rPRtsYEZIOZ5qLhF_CV3ZlZ7yuH4i1ps0knYuXZSdl1tXVXhpShxu2KGxUNe4txJ4Y_1S8ktTKghRryMEO0JOrPk8QkL1T77MGVekgLGKr16bfW5yzu3EJiyvwhHKDZOy3j7Pf5G-kmvjb_GTJ0k | 162 KB | 60 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 148 KB | 59 KB (40%) | ✓ | 3rd |
| https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=ED&pga4=G-TTBYENS3X0&cto=6&subagency=OCO | 9 KB | — | ✓ | 3rd |
| https://www.clarity.ms/tag/kqemjo0aad | 1 KB | — | ✓ | 3rd |
| https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js | 4 KB | — | ✓ | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 25 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
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 Loading8 fonts (794 KB)PASS
Web fonts
8
794 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~601 KB and ~1202 ms
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
Network Waterfall57 requests over 2405msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 620ms | 0 KB | — | €7/mo | Costly |
www.ed.gov www.ed.gov | Other | 500ms | 162 KB | 37% | €5/mo | Costly |
www.ed.gov www.ed.gov | Other | 477ms | 18 KB | — | €5/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 378ms | 25 KB | — | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 325ms | 148 KB | 40% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 243ms | 153 KB | 40% | €3/mo | Costly |
dap.digitalgov.gov dap.digitalgov.gov | Other | 115ms | 4 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 104ms | 153 KB | 69% | €1/mo | Optional |
www.ed.gov www.ed.gov | Other | 73ms | 109 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 620ms and costs ~€7/month
- www.ed.gov adds 500ms and costs ~€5/month
- www.ed.gov adds 477ms and costs ~€5/month
- Microsoft Clarity adds 378ms and costs ~€4/month
- Google Tag Manager adds 325ms and costs ~€4/month
- Google Tag Manager adds 243ms 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
Unattributable takes 620ms 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.ed.gov takes 500ms 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.ed.gov takes 477ms 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
Microsoft Clarity takes 378ms 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 325ms 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 243ms 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
69% of Google Tag Manager'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