Performance
· 15 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.
3.35 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
13 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.107
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.11 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.
4.57 s
Page Load Progression
FPage Weight BudgetAction2.8 MB transferred, 118 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
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction118 resources · 2.8 MB · 280 KB savings availableFIX
~279.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 118 resources | 2.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction40 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
BJS Execution Cost705ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.blm.gov/ | 265ms | 17ms | 1ms | 3rd |
| Unattributable | 147ms | 2ms | 0ms | 3rd |
| https://www.blm.gov/core/misc/drupal.init.js?v=11.3.8 | 92ms | 58ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 79ms | 61ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GQKKTMMT8V&cx=c>m=4e64k0 | 64ms | 52ms | 12ms | 3rd |
| https://www.blm.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js | 58ms | 55ms | 1ms | 3rd |
CJS BundlesAction62 scripts, 280 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=UA-23560114-3&cx=c>m=4e64k0h1 | 124 KB | 91 KB (74%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GQKKTMMT8V&cx=c>m=4e64k0 | 158 KB | 67 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-23560114-3 | 125 KB | 64 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 147 KB | 59 KB (40%) | ✓ | 3rd |
| https://www.blm.gov/modules/contrib/blazy/js/polyfill/blazy.polyfill.min.js?tdvvg2 | 1 KB | — | ✓ | 3rd |
| https://www.blm.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 | 27 KB | — | ✓ | 3rd |
| https://www.blm.gov/modules/contrib/blazy/js/polyfill/blazy.classlist.min.js?tdvvg2 | 1 KB | — | ✓ | 3rd |
| https://www.blm.gov/modules/contrib/blazy/js/polyfill/blazy.promise.min.js?tdvvg2 | 2 KB | — | ✓ | 3rd |
| https://www.blm.gov/modules/contrib/blazy/js/polyfill/blazy.raf.min.js?tdvvg2 | 1 KB | — | ✓ | 3rd |
| https://www.blm.gov/core/assets/vendor/once/once.min.js?v=1.0.1 | 1 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (182 KB)PASS
Web fonts
4
182 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~64 KB and ~128 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall118 requests over 6966msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.blm.gov www.blm.gov | Other | 265ms | 23 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 147ms | 0 KB | — | €2/mo | Optional |
www.blm.gov www.blm.gov | Other | 92ms | 1 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 79ms | 147 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 64ms | 158 KB | 42% | €1/mo | Optional |
www.blm.gov www.blm.gov | Other | 58ms | 0 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.blm.gov adds 265ms 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.blm.gov takes 265ms 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