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.
6.08 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.46 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.49 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.
29.91 s
Page Load Progression
FPage Weight BudgetAction6.4 MB transferred, 125 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 CostAction16551ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.deepl.com/app-storefront/_next/static/chunks/8665-63687f707ea94980.js | 3676ms | 3144ms | 97ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/webpack-d1be8a95265a13cd.js | 2766ms | 2677ms | 3ms | 3rd |
| Unattributable | 2582ms | 74ms | 0ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/2122.03e36ee23dee24f6.js | 2039ms | 1421ms | 27ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/1dd3208c-db20bb1d8e3bcc9b.js | 1297ms | 1152ms | 27ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/47bf8baf-2489944084be743a.js | 1017ms | 581ms | 37ms | 3rd |
| https://www.deepl.com/en | 1006ms | 40ms | 42ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/5904.514bfac5c80e25c5.js | 763ms | 422ms | 8ms | 3rd |
| https://gtm.deepl.com/gtm.js?id=GTM-5F5PGZ5P | 318ms | 215ms | 92ms | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/4794-c12605707d915675.js | 303ms | 14ms | 115ms | 3rd |
Showing top 10 of 16 scripts
FJS BundlesAction44 scripts, 515 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://gtm.deepl.com/gtm.js?id=GTM-5F5PGZ5P | 218 KB | 107 KB (49%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/47bf8baf-2489944084be743a.js | 111 KB | 72 KB (65%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/4794-c12605707d915675.js | 385 KB | 60 KB (16%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/2122.03e36ee23dee24f6.js | 72 KB | 60 KB (83%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/8665-63687f707ea94980.js | 145 KB | 53 KB (36%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/app/%5Blang%5D/page-9919593d7c97fa39.js | 464 KB | 51 KB (11%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/main-app-a21f1b297f05aae6.js | 96 KB | 34 KB (35%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/99.10c07ae3ea065172.js | 51 KB | 31 KB (63%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/6436.bcb23c3434438677.js | 43 KB | 25 KB (61%) | ✓ | 3rd |
| https://www.deepl.com/app-storefront/_next/static/chunks/3413-92b6b50615abd59b.js | 40 KB | 22 KB (56%) | ✓ | 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 InventoryAction125 resources · 6.4 MB · 515 KB savings availableFIX
~515.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 125 resources | 6.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction25 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
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 Loading3 fonts (175 KB)PASS
Web fonts
3
175 KB total
Render-blocking
0
of 3
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 Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
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 Waterfall125 requests over 6615msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.deepl.com www.deepl.com | Other | 3676ms | 145 KB | 36% | €40/mo | Costly |
www.deepl.com www.deepl.com | Other | 2766ms | 5 KB | — | €30/mo | Costly |
Unattributable Unattributable | Other | 2582ms | 0 KB | — | €28/mo | Costly |
www.deepl.com www.deepl.com | Other | 2039ms | 72 KB | 83% | €22/mo | Costly |
www.deepl.com www.deepl.com | Other | 1297ms | 78 KB | — | €14/mo | Costly |
www.deepl.com www.deepl.com | Other | 1017ms | 111 KB | 65% | €11/mo | Costly |
www.deepl.com www.deepl.com | Other | 1006ms | 116 KB | — | €11/mo | Costly |
www.deepl.com www.deepl.com | Other | 763ms | 18 KB | — | €8/mo | Costly |
gtm.deepl.com gtm.deepl.com | Other | 318ms | 218 KB | 49% | €3/mo | Costly |
www.deepl.com www.deepl.com | Other | 303ms | 385 KB | 16% | €3/mo | Costly |
www.deepl.com www.deepl.com | Other | 194ms | 464 KB | 11% | €2/mo | Optional |
clearance.deepl.com clearance.deepl.com | Other | 186ms | 0 KB | — | €2/mo | Optional |
challenges.cloudflare.com challenges.cloudflare.com | Other | 149ms | 0 KB | — | €2/mo | Optional |
www.deepl.com www.deepl.com | Other | 124ms | 51 KB | 63% | €1/mo | Optional |
www.deepl.com www.deepl.com | Other | 66ms | 15 KB | — | €1/mo | Optional |
www.deepl.com www.deepl.com | Other | 65ms | 1 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.deepl.com adds 3676ms and costs ~€40/month
- www.deepl.com adds 2766ms and costs ~€30/month
- Unattributable adds 2582ms and costs ~€28/month
- www.deepl.com adds 2039ms and costs ~€22/month
- www.deepl.com adds 1297ms and costs ~€14/month
- www.deepl.com adds 1017ms and costs ~€11/month
- www.deepl.com adds 1006ms and costs ~€11/month
- www.deepl.com adds 763ms and costs ~€8/month
- gtm.deepl.com adds 318ms and costs ~€3/month
- www.deepl.com adds 303ms 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.deepl.com takes 3676ms 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.deepl.com takes 2766ms 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 2582ms 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.deepl.com takes 2039ms 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
83% of www.deepl.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.deepl.com takes 1297ms 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.deepl.com takes 1017ms 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
65% of www.deepl.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.deepl.com takes 1006ms 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.deepl.com takes 763ms 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
gtm.deepl.com takes 318ms 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.deepl.com takes 303ms 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
63% of www.deepl.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