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.
2.08 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
104 ms
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.
3.22 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.
4.77 s
Page Load Progression
806 ms
1.6 s
2.4 s
3.2 s 4.0 s 4.8 s 5.6 s
6.4 sDPage Weight BudgetAction2.4 MB transferred, 182 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 BundlesAction97 scripts, 427 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 92 KB (49%) | ✓ | 3rd |
| https://dict.leo.org/js/extern/bidhead9.43.0.js | 123 KB | 88 KB (72%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZRSPD2LMGF&cx=c&_slc=1 | 163 KB | 70 KB (43%) | ✓ | 3rd |
| https://cookie-cdn.cookiepro.com/scripttemplates/202501.2.0/otBannerSdk.js | 115 KB | 58 KB (51%) | ✓ | 3rd |
| https://dict.leo.org/js/dist/chunks/6fe10f3518ce79e2de03-8816e336.js | 46 KB | 45 KB (98%) | ✓ | 3rd |
| https://dict.leo.org/js/dist/chunks/dffbd8d9679321950411-66417d04.js | 34 KB | 32 KB (95%) | ✓ | 3rd |
| https://dict.leo.org/js/dist/chunks/2273642fd8b6c8e41218-3ef9fd3e.js | 30 KB | 21 KB (71%) | ✓ | 3rd |
| https://dict.leo.org/js/dist/chunks/48b9875efa6fcd35a334-99b13c27.js | 22 KB | 20 KB (93%) | ✓ | 3rd |
| https://dict.leo.org/js/dist/ionic-6.7.5/p-c229b18b.entry.js | 1 KB | — | ✓ | 3rd |
| https://dict.leo.org/js/dist/ionic-6.7.5/p-fe01417c.js | 1 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 InventoryAction182 resources · 2.4 MB · 427 KB savings availableFIX
~426.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 182 resources | 2.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization34 images, 0 KB saveableREVIEW
CJS Execution CostAction1572ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 450ms | 51ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 247ms | 214ms | 19ms | 3rd |
| https://dict.leo.org/js/dist/modern/www.webpack-89e857db.js | 215ms | 166ms | 4ms | 3rd |
| https://dict.leo.org/js/dist/chunks/6fe10f3518ce79e2de03-8816e336.js | 142ms | 132ms | 5ms | 3rd |
| https://dict.leo.org/js/dist/ionic-6.7.5/p-d472be56.js | 101ms | 67ms | 0ms | 3rd |
| https://www.leo.org/german-english | 98ms | 2ms | 1ms | 3rd |
| https://cookie-cdn.cookiepro.com/scripttemplates/202501.2.0/otBannerSdk.js | 97ms | 71ms | 12ms | 3rd |
| https://dict.leo.org/js/dist/chunks/dffbd8d9679321950411-66417d04.js | 84ms | 75ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZRSPD2LMGF&cx=c&_slc=1 | 82ms | 68ms | 12ms | 3rd |
| https://dict.leo.org/js/extern/bidhead9.43.0.js | 56ms | 47ms | 9ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (21 KB)PASS
Web fonts
1
21 KB total
Render-blocking
0
of 1
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall182 requests over 6789msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 450ms | 0 KB | — | €7/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 247ms | 188 KB | 49% | €4/mo | Costly |
dict.leo.org dict.leo.org | Other | 215ms | 50 KB | — | €3/mo | Costly |
dict.leo.org dict.leo.org | Other | 142ms | 46 KB | 98% | €2/mo | Optional |
dict.leo.org dict.leo.org | Other | 101ms | 7 KB | — | €2/mo | Optional |
www.leo.org www.leo.org | Other | 98ms | 14 KB | — | €2/mo | Optional |
cookie-cdn.cookiepro.com cookie-cdn.cookiepro.com | Other | 97ms | 115 KB | 51% | €2/mo | Optional |
dict.leo.org dict.leo.org | Other | 84ms | 34 KB | 95% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 82ms | 163 KB | 43% | €1/mo | Optional |
dict.leo.org dict.leo.org | Other | 56ms | 123 KB | 72% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 450ms and costs ~€7/month
- securepubads.g.doubleclick.net adds 247ms and costs ~€4/month
- dict.leo.org adds 215ms 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
Unattributable takes 450ms 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
securepubads.g.doubleclick.net takes 247ms 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
dict.leo.org takes 215ms 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
98% of dict.leo.org'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
51% of cookie-cdn.cookiepro.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
95% of dict.leo.org'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
72% of dict.leo.org'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