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.
1.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
225 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.022
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.04 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.
4.39 s
Page Load Progression
722 ms
1.4 s
2.2 s
2.9 s 3.6 s
4.3 s 5.1 s
5.8 sDThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2158ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.on24.com/ | 556ms | 59ms | 4ms | 3rd |
| Unattributable | 315ms | 44ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NKPS2G | 274ms | 244ms | 18ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1069574889&cx=c>m=4e64h1 | 215ms | 202ms | 10ms | 3rd |
| https://script.crazyegg.com/pages/versioned/commontransformations-scripts/df706026807a27b189c4eeedc429ebbf.js | 152ms | 138ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-EPVQ5FZV49&cx=c>m=4e64h1 | 131ms | 99ms | 16ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 126ms | 106ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3BPFZFSGR0&cx=c>m=4e64h1 | 84ms | 58ms | 24ms | 3rd |
| https://connect.facebook.net/signals/config/7150223215068358?v=2.9.303&r=stable&domain=www.on24.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 69ms | 56ms | 6ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202502.1.0/otBannerSdk.js | 64ms | 47ms | 12ms | 3rd |
Showing top 10 of 13 scripts
DJS BundlesAction37 scripts, 454 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/destination?id=G-EPVQ5FZV49&cx=c>m=4e64h1 | 173 KB | 70 KB (40%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202502.1.0/otBannerSdk.js | 115 KB | 65 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3BPFZFSGR0&cx=c>m=4e64h1 | 158 KB | 62 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NKPS2G | 181 KB | 60 KB (33%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1069574889&cx=c>m=4e64h1 | 144 KB | 56 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-9855888 | 130 KB | 54 KB (42%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 34 KB (35%) | ✓ | 3rd |
| https://script.crazyegg.com/pages/versioned/commontransformations-scripts/df706026807a27b189c4eeedc429ebbf.js | 72 KB | 33 KB (46%) | ✓ | 3rd |
| https://code.jquery.com/jquery-3.6.0.min.js?ver=3.6.0 | 31 KB | 21 KB (69%) | ✓ | 3rd |
| https://communications.on24.com/rs/848-AHN-047/images/rwts.js | 10 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 InventoryAction133 resources · 1.8 MB · 454 KB savings availableFIX
~454.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 133 resources | 1.8 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-cache, no-store, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
CPage Weight BudgetAction1.8 MB transferred, 133 requestsREVIEW
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
CImage OptimizationAction39 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (58 KB)PASS
Web fonts
4
58 KB total
Render-blocking
0
of 4
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Kinsta
Network Waterfall133 requests over 5717msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.on24.com www.on24.com | Other | 556ms | 54 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 315ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 274ms | 181 KB | 33% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 215ms | 144 KB | 39% | $3/mo | Costly |
script.crazyegg.com script.crazyegg.com | Other | 152ms | 72 KB | 46% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 131ms | 173 KB | 40% | $2/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 126ms | 26 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 84ms | 158 KB | 39% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 69ms | 45 KB | — | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 64ms | 115 KB | 56% | $1/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 61ms | 130 KB | 42% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 56ms | 97 KB | 35% | $1/mo | Optional |
cdn.bizible.com cdn.bizible.com | Other | 54ms | 25 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.on24.com adds 556ms and costs ~$7/month
- Unattributable adds 315ms and costs ~$4/month
- Google Tag Manager adds 274ms and costs ~$4/month
- Google Tag Manager 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
www.on24.com takes 556ms 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
Unattributable takes 315ms 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 274ms 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 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
56% of OneTrust'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