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.
1.27 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.87 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
191 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.021
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.61 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.
7.01 s
Page Load Progression
FPage Weight BudgetAction5.6 MB transferred, 294 requestsFIX
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
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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 Execution CostAction3953ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 608ms | 65ms | 0ms | 3rd |
| https://www.cvent.com/ | 482ms | 10ms | 2ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 478ms | 424ms | 25ms | 3rd |
| https://ob.tostarsbuilding.com/i/6d038e9dd87a0bd19febcbdf5c4e2b8c.js | 245ms | 181ms | 5ms | 3rd |
| https://cdn.mouseflow.com/projects/33baeca1-461c-4bfb-8e3c-0b6cda6810e3.js | 216ms | 196ms | 4ms | 3rd |
| https://hello.cvent.com/js/forms2/js/forms2.min.js | 212ms | 140ms | 16ms | 3rd |
| https://www.cvent.com/libraries/lazysizes/lazysizes.js | 193ms | 121ms | 1ms | 3rd |
| https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js | 187ms | 128ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1062529273&cx=c>m=4e64h1h1 | 153ms | 131ms | 19ms | 3rd |
| https://assets.adobedtm.com/f7740e1036fc/bfeb87c49c57/launch-69c1cbfb4b29.min.js | 134ms | 107ms | 14ms | 3rd |
Showing top 10 of 23 scripts
FJS BundlesAction126 scripts, 1.2 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 157 KB (43%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 157 KB (43%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 157 KB (43%) | ✓ | 3rd |
| https://rtp-static.marketo.com/rtp/libs/jqueryui/1.13.2/jquery-custom-ui.min.js | 126 KB | 106 KB (85%) | ✗ | 3rd |
| https://cdn.optimizely.com/js/96642877.js | 160 KB | 88 KB (55%) | ✓ | 3rd |
| https://cvent.chilipiper.com/chat/embed/assets/masterChefUrl-BtDzI9DH.js | 108 KB | 78 KB (72%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-T5GZBZKR | 144 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1062529273&cx=c>m=4e64h1h1 | 147 KB | 52 KB (35%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202308.1.0/otBannerSdk.js | 99 KB | 50 KB (50%) | ✓ | 3rd |
| https://cvent.chilipiper.com/concierge-js/cjs/concierge.js | 55 KB | 40 KB (78%) | ✓ | 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 InventoryAction294 resources · 5.6 MB · 1.2 MB savings availableFIX
~1.2 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 294 resources | 5.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization58 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
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 (259 KB)PASS
Web fonts
8
259 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
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 ~8 KB and ~16 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall294 requests over 9494msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 608ms | 0 KB | — | €11/mo | Costly |
www.cvent.com www.cvent.com | Other | 482ms | 36 KB | — | €8/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 478ms | 0 KB | 43% | €8/mo | Costly |
ob.tostarsbuilding.com ob.tostarsbuilding.com | Other | 245ms | 45 KB | — | €4/mo | Costly |
cdn.mouseflow.com cdn.mouseflow.com | Other | 216ms | 53 KB | 44% | €4/mo | Costly |
hello.cvent.com hello.cvent.com | Other | 212ms | 0 KB | 55% | €4/mo | Costly |
www.cvent.com www.cvent.com | Other | 193ms | 6 KB | — | €3/mo | Optional |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 187ms | 52 KB | 58% | €3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 153ms | 147 KB | 35% | €3/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 134ms | 107 KB | 32% | €2/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 133ms | 99 KB | 50% | €2/mo | Essential |
cdn.rudderlabs.com cdn.rudderlabs.com | Other | 126ms | 32 KB | — | €2/mo | Optional |
Optimizely cdn.optimizely.com | A/B Testing | 94ms | 160 KB | 55% | €2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 93ms | 45 KB | — | €2/mo | Optional |
www.cvent.com www.cvent.com | Other | 88ms | 5 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 88ms | 144 KB | 45% | €2/mo | Optional |
obs.tostarsbuilding.com obs.tostarsbuilding.com | Other | 77ms | 2 KB | — | €1/mo | Optional |
cdn.bizible.com cdn.bizible.com | Other | 69ms | 25 KB | — | €1/mo | Optional |
sjrtp-cdn.marketo.com sjrtp-cdn.marketo.com | Other | 60ms | 42 KB | 59% | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 57ms | 97 KB | 34% | €1/mo | Optional |
j.6sc.co j.6sc.co | Other | 55ms | 19 KB | — | €1/mo | Optional |
rtp-static.marketo.com rtp-static.marketo.com | Other | 52ms | 126 KB | 85% | €1/mo | Optional |
www.cvent.com www.cvent.com | Other | 52ms | 2 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 608ms and costs ~€11/month
- www.cvent.com adds 482ms and costs ~€8/month
- www.gstatic.com adds 478ms and costs ~€8/month
- ob.tostarsbuilding.com adds 245ms and costs ~€4/month
- cdn.mouseflow.com adds 216ms and costs ~€4/month
- hello.cvent.com adds 212ms and costs ~€4/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 608ms 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.cvent.com takes 482ms 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.gstatic.com takes 478ms 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
ob.tostarsbuilding.com takes 245ms 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
cdn.mouseflow.com takes 216ms 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
hello.cvent.com takes 212ms 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
55% of hello.cvent.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
58% of www.datadoghq-browser-agent.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
50% 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
55% of Optimizely'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
59% of sjrtp-cdn.marketo.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
85% of rtp-static.marketo.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