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.
2.11 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.73 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.037
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.25 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.
18.86 s
Page Load Progression
FPage Weight BudgetAction2.6 MB transferred, 112 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
FJS Execution CostAction4401ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-WF3KCX5 | 910ms | 750ms | 100ms | 3rd |
| https://www.istockphoto.com/sign-in/assets/application.bcff7cfba3806a91d3d9.js | 877ms | 696ms | 147ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 796ms | 666ms | 81ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Y8EH5J3SQE&cx=c>m=4e64h1 | 556ms | 507ms | 42ms | 3rd |
| Unattributable | 534ms | 25ms | 0ms | 3rd |
| https://www.istockphoto.com/fr/bot-wall?returnUrl=%2Ffr | 259ms | 9ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QC44P078CM&cx=c>m=4e64h1 | 257ms | 219ms | 35ms | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/__federation_expose_CustomerNotifications.85d5cf804948db568da1.js | 91ms | 83ms | 8ms | 3rd |
| https://www.istockphoto.com/sign-in/assets/4183.83fcbe735947bb3886c4.js | 69ms | 39ms | 29ms | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/remoteEntry.7e8bbd9eef2db30bf33e.js | 52ms | 43ms | 7ms | 3rd |
FJS BundlesAction33 scripts, 626 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.istockphoto.com/sign-in/assets/application.bcff7cfba3806a91d3d9.js | 364 KB | 183 KB (51%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-Y8EH5J3SQE&cx=c>m=4e64h1 | 169 KB | 64 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QC44P078CM&cx=c>m=4e64h1 | 144 KB | 63 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WF3KCX5 | 191 KB | 53 KB (28%) | ✓ | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/117.25a61595d644d6fef239.js | 50 KB | 33 KB (67%) | ✓ | 3rd |
| https://www.istockphoto.com/components/global-nav/static/remoteEntry.5520637637cb99eecb02.js | 44 KB | 28 KB (65%) | ✓ | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/__federation_expose_CustomerNotifications.85d5cf804948db568da1.js | 32 KB | 25 KB (79%) | ✓ | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/remoteEntry.7e8bbd9eef2db30bf33e.js | 25 KB | — | ✓ | 3rd |
| https://www.istockphoto.com/components/customer-notifications/static/798.2d21986f71e694c79f92.js | 6 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 InventoryAction112 resources · 2.6 MB · 626 KB savings availableFIX
~626.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 112 resources | 2.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization13 images, 0 KB saveableREVIEW
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 (111 KB)PASS
Web fonts
4
111 KB total
Render-blocking
0
of 4
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 ~23 KB and ~46 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall112 requests over 4876msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 910ms | 191 KB | 28% | €10/mo | Costly |
www.istockphoto.com www.istockphoto.com | Other | 877ms | 364 KB | 51% | €10/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 796ms | 362 KB | 49% | €9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 556ms | 169 KB | 38% | €6/mo | Costly |
Unattributable Unattributable | Other | 534ms | 0 KB | — | €6/mo | Costly |
www.istockphoto.com www.istockphoto.com | Other | 259ms | 8 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 257ms | 144 KB | 44% | €3/mo | Costly |
www.istockphoto.com www.istockphoto.com | Other | 91ms | 32 KB | 79% | €1/mo | Optional |
www.istockphoto.com www.istockphoto.com | Other | 69ms | 54 KB | — | €1/mo | Optional |
www.istockphoto.com www.istockphoto.com | Other | 52ms | 25 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 910ms and costs ~€10/month
- www.istockphoto.com adds 877ms and costs ~€10/month
- www.gstatic.com adds 796ms and costs ~€9/month
- Google Tag Manager adds 556ms and costs ~€6/month
- Unattributable adds 534ms and costs ~€6/month
- www.istockphoto.com adds 259ms and costs ~€3/month
- Google Tag Manager adds 257ms 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
Google Tag Manager takes 910ms 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.istockphoto.com takes 877ms 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
51% of www.istockphoto.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
www.gstatic.com takes 796ms 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 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 534ms 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.istockphoto.com takes 259ms 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 257ms 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
79% of www.istockphoto.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