Performance
· 17 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.
2.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.87 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
156 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.019
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.78 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.
13.17 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2370ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.festival-cannes.com/ | 645ms | 34ms | 2ms | 3rd |
| Unattributable | 501ms | 6ms | 0ms | 3rd |
| https://www.festival-cannes.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 397ms | 373ms | 8ms | 3rd |
| https://www.festival-cannes.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js | 379ms | 247ms | 6ms | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/gsap.min.js?ver=1776865064 | 234ms | 33ms | 5ms | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/dist/js/algolia-autocomplete.js?ver=1776865063 | 108ms | 40ms | 37ms | 3rd |
| https://affif.containers.piwik.pro/66e0bc7d-d182-40f8-bf1c-fa9db0cb4771.js | 105ms | 87ms | 17ms | 3rd |
DPage Weight InventoryAction79 resources · 1.9 MB · 133 KB savings availableFIX
~132.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 1.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.9 MB transferred, 79 requestsREVIEW
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
BImage Optimization32 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
CJS BundlesAction22 scripts, 133 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://affif.containers.piwik.pro/66e0bc7d-d182-40f8-bf1c-fa9db0cb4771.js | 69 KB | 40 KB (58%) | ✓ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/plyr.polyfilled.min.js?ver=1776865064 | 36 KB | 33 KB (91%) | ✓ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/swiper.min.js?ver=1776865064 | 49 KB | 31 KB (65%) | ✗ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/dist/js/algolia-autocomplete.js?ver=1776865063 | 65 KB | 29 KB (46%) | ✗ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/motus.web.js?ver=1776865064 | 10 KB | — | ✓ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/glightbox.min.js?ver=1776865064 | 19 KB | — | ✗ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/gsap.min.js?ver=1776865064 | 29 KB | — | ✓ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/split-type.js?ver=1776865064 | 4 KB | — | ✓ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/main.js?ver=1776865064 | 14 KB | — | ✗ | 3rd |
| https://www.festival-cannes.com/wp-content/themes/fdc/js/vendor/van11y-accessible-accordion-aria.js?ver=1776865064 | 5 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (106 KB)PASS
Web fonts
5
106 KB total
Render-blocking
0
of 5
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+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall79 requests over 910msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.festival-cannes.com www.festival-cannes.com | Other | 645ms | 26 KB | — | $9/mo | Costly |
Unattributable Unattributable | Other | 501ms | 0 KB | — | $7/mo | Costly |
www.festival-cannes.com www.festival-cannes.com | Other | 397ms | 0 KB | — | $5/mo | Costly |
www.festival-cannes.com www.festival-cannes.com | Other | 379ms | 4 KB | — | $5/mo | Costly |
www.festival-cannes.com www.festival-cannes.com | Other | 234ms | 29 KB | — | $3/mo | Costly |
www.festival-cannes.com www.festival-cannes.com | Other | 108ms | 65 KB | 46% | $1/mo | Optional |
affif.containers.piwik.pro affif.containers.piwik.pro | Other | 105ms | 69 KB | 58% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.festival-cannes.com adds 645ms and costs ~$9/month
- Unattributable adds 501ms and costs ~$7/month
- www.festival-cannes.com adds 397ms and costs ~$5/month
- www.festival-cannes.com adds 379ms and costs ~$5/month
- www.festival-cannes.com adds 234ms 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.festival-cannes.com takes 645ms 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 501ms 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.festival-cannes.com takes 397ms 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.festival-cannes.com takes 379ms 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.festival-cannes.com takes 234ms 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
58% of affif.containers.piwik.pro'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