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.
782 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.86 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
10 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.162
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.96 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.
3.85 s
Page Load Progression
FPage Weight BudgetAction7.9 MB transferred, 108 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
FJS BundlesAction27 scripts, 631 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.ansi.org/Areas/ANSI/js/ANSI.bundle.js | 311 KB | 224 KB (72%) | ✗ | 3rd |
| https://acsbapp.com/apps/app/dist/js/app.js | 222 KB | 114 KB (53%) | ✓ | 3rd |
| https://www.ansi.org/Coveo/Hive/js/CoveoJsSearch.Lazy.min.js | 209 KB | 94 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6NE40HPYPR&cx=c>m=4e64k1h2 | 177 KB | 69 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1071668309&cx=c>m=4e64k1h2 | 146 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WGZXGD | 153 KB | 65 KB (43%) | ✓ | 3rd |
| https://www.ansi.org/Coveo/Hive/js/ValidateAnalyticsIncluded.min.js | 1 KB | — | ✓ | 3rd |
| https://www.ansi.org/Coveo/Hive/js/CoveoForSitecoreFilterExpression.min.js | 3 KB | — | ✓ | 3rd |
| https://www.ansi.org/Areas/ANSI/js/ANSI.bundle.config.js?r= | 2 KB | — | ✓ | 3rd |
| https://www.ansi.org/Coveo/Hive/js/FacetsMobileMode.min__4e9032d9a7117b17aab0.js | 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
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 InventoryAction108 resources · 7.9 MB · 631 KB savings availableFIX
~630.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 108 resources | 7.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction53 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 Execution CostAction1032ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 215ms | 5ms | 0ms | 3rd |
| https://www.ansi.org/ | 182ms | 5ms | 1ms | 3rd |
| https://www.ansi.org/Areas/ANSI/js/ANSI.bundle.js | 151ms | 34ms | 30ms | 3rd |
| https://www.ansi.org/Areas/ScoreCCF/js/Vendor/require.js?r= | 145ms | 107ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6NE40HPYPR&cx=c>m=4e64k1h2 | 102ms | 87ms | 14ms | 3rd |
| https://acsbapp.com/apps/app/dist/js/app.js | 96ms | 65ms | 17ms | 3rd |
| https://consent.cookiebot.com/d8cad3b9-fcb1-4742-91a0-0e1bc49c50d8/cc.js?renew=false&referer=www.ansi.org&dnt=false&init=false | 80ms | 33ms | 8ms | 3rd |
| https://www.ansi.org/Coveo/Hive/js/CoveoJsSearch.Lazy.min.js | 62ms | 37ms | 16ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (142 KB)PASS
Web fonts
7
142 KB total
Render-blocking
0
of 7
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
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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 ~35 KB and ~70 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 Waterfall108 requests over 4541msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 215ms | 0 KB | — | $3/mo | Costly |
www.ansi.org www.ansi.org | Other | 182ms | 25 KB | — | $2/mo | Optional |
www.ansi.org www.ansi.org | Other | 151ms | 311 KB | 72% | $2/mo | Optional |
www.ansi.org www.ansi.org | Other | 145ms | 21 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 102ms | 177 KB | 39% | $1/mo | Optional |
acsbapp.com acsbapp.com | Other | 96ms | 222 KB | 53% | $1/mo | Optional |
consent.cookiebot.com consent.cookiebot.com | Other | 80ms | 82 KB | — | $1/mo | Optional |
www.ansi.org www.ansi.org | Other | 62ms | 209 KB | 47% | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 215ms 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 215ms 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
72% of www.ansi.org'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
53% of acsbapp.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