Performance
· 22 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.
763 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
198 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.101
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.75 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.
3.38 s
Page Load Progression
FPage Weight BudgetAction18.6 MB transferred, 193 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
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
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
DJS Execution CostAction2503ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.usatf.org/ | 730ms | 12ms | 8ms | 3rd |
| Unattributable | 486ms | 53ms | 0ms | 1st |
| https://acsbapp.com/apps/app/dist/js/app.js | 253ms | 185ms | 35ms | 3rd |
| https://cdn.curator.io/5.0/curator.embed.js | 250ms | 140ms | 18ms | 3rd |
| https://www.usatf.org/CMSTemplates/USATF/scripts/main-script.js?v=27 | 129ms | 19ms | 7ms | 3rd |
| https://connect.facebook.net/signals/config/990614502211933?v=2.9.385&r=stable&domain=www.usatf.org&hme=1a72ec78e057d90ba48afa55a82b063b1c9b6ab7c0155009fecc72226a622ed2&ex_m=113%2C218%2C164%2C25%2C78%2C79%2C156%2C74%2C73%2C11%2C174%2C98%2C19%2C148%2C136%2C43%2C81%2C86%2C144%2C169%2C176%2C29%2C17%2C30%2C31%2C32%2C34%2C52%2C157%2C83%2C121%2C21%2C23%2C48%2C44%2C46%2C45%2C91%2C100%2C104%2C119%2C155%2C158%2C50%2C120%2C27%2C24%2C128%2C75%2C40%2C160%2C159%2C161%2C152%2C150%2C28%2C39%2C63%2C118%2C171%2C76%2C20%2C123%2C89%2C72%2C22%2C93%2C94%2C125%2C92%2C146%2C145%2C149%2C105%2C170%2C173%2C38%2C53%2C122%2C51%2C8%2C4%2C5%2C7%2C6%2C3%2C99%2C110%2C177%2C185%2C232%2C80%2C245%2C244%2C243%2C14%2C26%2C37%2C59%2C112%2C65%2C10%2C69%2C106%2C107%2C108%2C114%2C139%2C35%2C33%2C141%2C142%2C143%2C138%2C137%2C165%2C82%2C168%2C166%2C167%2C54%2C64%2C132%2C18%2C172%2C49%2C293%2C294%2C292%2C307%2C329%2C225%2C214%2C66%2C215%2C213%2C332%2C323%2C56%2C226%2C116%2C140%2C88%2C130%2C58%2C129%2C135%2C134%2C62%2C70%2C68%2C162%2C84%2C85%2C124%2C41%2C36%2C57%2C60%2C109%2C175%2C1%2C133%2C16%2C131%2C12%2C2%2C61%2C101%2C15%2C71%2C67%2C127%2C97%2C96%2C178%2C179%2C102%2C103%2C9%2C111%2C55%2C153%2C95%2C87%2C77%2C126%2C115%2C47%2C154%2C0%2C90%2C147%2C151%2C163%2C42%2C117%2C13%2C180 | 118ms | 91ms | 13ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 110ms | 91ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Q286FMRQ1P&cx=c&_slc=1 | 107ms | 78ms | 28ms | 3rd |
| https://cdn.ai12z.net/pkg/ai12z@latest/dist/esm/index-DrTyKvbY.js | 98ms | 50ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KD3QML4 | 88ms | 68ms | 11ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction51 scripts, 723 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://acsbapp.com/apps/app/dist/js/app.js | 229 KB | 118 KB (53%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Q286FMRQ1P&cx=c&_slc=1 | 177 KB | 76 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KD3QML4 | 131 KB | 65 KB (49%) | ✓ | 3rd |
| https://cdn.curator.io/5.0/curator.embed.js | 104 KB | 63 KB (61%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/bundle/sdk.js/ | 79 KB | 55 KB (69%) | ✓ | 3rd |
| https://cdn.ai12z.net/pkg/ai12z@latest/dist/esm/ai12z-category_2.entry.js | 67 KB | 54 KB (81%) | ✗ | 3rd |
| https://cdn.ai12z.net/pkg/ai12z@latest/dist/esm/index-CjSLTZFw.js | 74 KB | 44 KB (60%) | ✗ | 3rd |
| https://www.usatf.org/CMSTemplates/USATF/scripts/main-script.js?v=27 | 50 KB | 39 KB (79%) | ✓ | 3rd |
| https://www.usatf.org/cmstemplates/usatf/assets/swiper/package/swiper-bundle.min.js | 39 KB | 38 KB (97%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 105 KB | 37 KB (35%) | ✓ | 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 InventoryAction193 resources · 18.6 MB · 723 KB savings availableFIX
~722.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 193 resources | 18.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction63 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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
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 Loading11 fonts (222 KB)PASS
Web fonts
11
222 KB total
Render-blocking
0
of 11
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+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Network Waterfall193 requests over 6932msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.usatf.org www.usatf.org | Other | 730ms | 42 KB | — | $10/mo | Costly |
acsbapp.com acsbapp.com | Other | 253ms | 229 KB | 53% | $3/mo | Costly |
cdn.curator.io cdn.curator.io | Other | 250ms | 104 KB | 61% | $3/mo | Costly |
www.usatf.org www.usatf.org | Other | 129ms | 50 KB | 79% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 118ms | 122 KB | 24% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 110ms | 105 KB | 35% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 107ms | 177 KB | 43% | $1/mo | Optional |
cdn.ai12z.net cdn.ai12z.net | Other | 98ms | 54 KB | 57% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 88ms | 131 KB | 49% | $1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 80ms | 30 KB | — | $1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 55ms | 21 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.usatf.org adds 730ms and costs ~$10/month
- acsbapp.com adds 253ms and costs ~$3/month
- cdn.curator.io adds 250ms and costs ~$3/month
81% 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.usatf.org takes 730ms 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
acsbapp.com takes 253ms 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
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
cdn.curator.io takes 250ms 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
61% of cdn.curator.io'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
79% of www.usatf.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
57% of cdn.ai12z.net'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
Image Optimization59 images, 13730 KB total, 215 KB wastedINFO
Image Optimization Audit
Total Images
59
Total Size
13730 KB
Oversized
15
Wasted
215 KB