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.
1.11 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.79 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
460 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.018
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.65 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.
4.11 s
Page Load Progression
798 ms
1.6 s
2.4 s
3.2 s
4.0 s 4.8 s
5.6 s
6.4 sFPage Weight BudgetAction8.4 MB transferred, 170 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
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 CostAction2652ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.cirquedusoleil.com/dist/v3/cds/ver20260414/js/app.cds.js | 681ms | 264ms | 1ms | 3rd |
| Unattributable | 445ms | 106ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17062073898&cx=c>m=4e64k1 | 321ms | 294ms | 12ms | 3rd |
| https://www.cirquedusoleil.com/ | 312ms | 12ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MNVPM8 | 270ms | 210ms | 29ms | 3rd |
| https://api.fouanalytics.com/api/init-6136zrgr6vs5tqpq3ltu.js | 157ms | 106ms | 1ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202509.1.0/otBannerSdk.js | 115ms | 70ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DVBKD0H3VF&cx=c>m=4e64k1 | 102ms | 85ms | 16ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 79ms | 66ms | 2ms | 3rd |
| https://js.monitor.azure.com/scripts/b/ai.3.gbl.min.js | 65ms | 46ms | 6ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction45 scripts, 599 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.cirquedusoleil.com/dist/v3/cds/ver20260414/js/app.cds.js | 221 KB | 125 KB (57%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202509.1.0/otBannerSdk.js | 122 KB | 63 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DVBKD0H3VF&cx=c>m=4e64k1 | 172 KB | 62 KB (36%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-16509702&cx=c>m=4e64k1 | 129 KB | 57 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17062073898&cx=c>m=4e64k1 | 144 KB | 56 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17062100749&cx=c>m=4e64k1 | 144 KB | 56 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-16582949&cx=c>m=4e64k1 | 129 KB | 56 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MNVPM8 | 211 KB | 53 KB (25%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 47 KB (49%) | ✓ | 3rd |
| https://js.monitor.azure.com/scripts/b/ai.3.gbl.min.js | 67 KB | 24 KB (36%) | ✓ | 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 InventoryAction170 resources · 8.4 MB · 599 KB savings availableFIX
~599.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 170 resources | 8.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction54 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
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
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 Loading4 fonts (97 KB)PASS
Web fonts
4
97 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
Network Waterfall170 requests over 5585msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.cirquedusoleil.com www.cirquedusoleil.com | Other | 681ms | 221 KB | 57% | €4/mo | Costly |
Unattributable Unattributable | Other | 445ms | 0 KB | — | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 321ms | 144 KB | 39% | €2/mo | Costly |
www.cirquedusoleil.com www.cirquedusoleil.com | Other | 312ms | 35 KB | — | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 270ms | 211 KB | 25% | €1/mo | Costly |
api.fouanalytics.com api.fouanalytics.com | Other | 157ms | 8 KB | — | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 115ms | 122 KB | 52% | €1/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 102ms | 172 KB | 36% | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 79ms | 26 KB | — | €0/mo | Optional |
js.monitor.azure.com js.monitor.azure.com | Other | 65ms | 67 KB | 36% | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 54ms | 144 KB | 39% | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 129 KB | 44% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.cirquedusoleil.com adds 681ms and costs ~€4/month
- Unattributable adds 445ms and costs ~€2/month
- Google Tag Manager adds 321ms and costs ~€2/month
- www.cirquedusoleil.com adds 312ms and costs ~€2/month
- Google Tag Manager adds 270ms and costs ~€1/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.cirquedusoleil.com takes 681ms 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
57% of www.cirquedusoleil.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
Unattributable takes 445ms 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 321ms 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.cirquedusoleil.com takes 312ms 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 270ms 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
52% 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