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.
1.53 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.47 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
92 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.071
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.01 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.
3.48 s
Page Load Progression
FPage Weight BudgetAction17.0 MB transferred, 90 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction90 resources · 17.0 MB · 284 KB savings availableFIX
~284.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 90 resources | 17.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction33 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
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 Execution CostAction1527ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cmp.osano.com/16BZ95S4qp9Kl2gUA/c84de61e-21d7-4a4a-9591-3d3a28fb5b1d/osano.js | 261ms | 196ms | 44ms | 3rd |
| https://cdn.rgpub.io/public/live/riotbar/latest/lol-rso-pbe.es-es.js | 256ms | 143ms | 10ms | 3rd |
| https://www.leagueoflegends.com/es-es/ | 245ms | 52ms | 1ms | 3rd |
| Unattributable | 238ms | 33ms | 0ms | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/framework-d5fbdf5171596063.js | 229ms | 180ms | 8ms | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/400-2ccb8cfe6c021e58.js | 107ms | 59ms | 25ms | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/pages/%5B%5B...pathArray%5D%5D-5ab3ec9789779be9.js | 99ms | 96ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N98J | 92ms | 79ms | 12ms | 3rd |
CJS BundlesAction26 scripts, 284 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.leagueoflegends.com/_next/static/chunks/400-2ccb8cfe6c021e58.js | 299 KB | 169 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N98J | 174 KB | 76 KB (43%) | ✓ | 3rd |
| https://cdn.rgpub.io/public/live/riotbar/latest/lol-rso-pbe.es-es.js | 119 KB | 40 KB (33%) | ✓ | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/pages/_app-8e1ba8c934f22784.js | 1 KB | — | ✓ | 3rd |
| blob:https://www.leagueoflegends.com/27c06dc7-ab88-41a3-ba4a-7bea720facc1 | -0 KB | — | ✓ | 3rd |
| https://dev.visualwebsiteoptimizer.com/j.php?a=774097&u=https%3A%2F%2Fwww.leagueoflegends.com%2Fes-es%2F&vn=2.1&x=true | 10 KB | — | ✓ | 3rd |
| https://cmp.osano.com/16BZ95S4qp9Kl2gUA/c84de61e-21d7-4a4a-9591-3d3a28fb5b1d/osano.js | 44 KB | — | ✓ | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/679-30c0a19c43bc4a4a.js | 23 KB | — | ✓ | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/116-1d5b070cbcaeb011.js | 5 KB | — | ✓ | 3rd |
| https://www.leagueoflegends.com/_next/static/chunks/framework-d5fbdf5171596063.js | 43 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
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 Loading9 fonts (753 KB)PASS
Web fonts
9
753 KB total
Render-blocking
0
of 9
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
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~259 KB and ~518 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall90 requests over 2654msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cmp.osano.com cmp.osano.com | Other | 261ms | 44 KB | — | €3/mo | Costly |
cdn.rgpub.io cdn.rgpub.io | Other | 256ms | 119 KB | 33% | €3/mo | Costly |
www.leagueoflegends.com www.leagueoflegends.com | Other | 245ms | 25 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 238ms | 0 KB | — | €3/mo | Costly |
www.leagueoflegends.com www.leagueoflegends.com | Other | 229ms | 43 KB | — | €2/mo | Costly |
www.leagueoflegends.com www.leagueoflegends.com | Other | 107ms | 299 KB | 56% | €1/mo | Optional |
www.leagueoflegends.com www.leagueoflegends.com | Other | 99ms | 1 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 92ms | 174 KB | 43% | €1/mo | Optional |
These scripts may cost more than they're worth
- cmp.osano.com adds 261ms and costs ~€3/month
- cdn.rgpub.io adds 256ms and costs ~€3/month
- www.leagueoflegends.com adds 245ms and costs ~€3/month
- Unattributable adds 238ms and costs ~€3/month
- www.leagueoflegends.com adds 229ms and costs ~€2/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
cmp.osano.com takes 261ms 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
cdn.rgpub.io takes 256ms 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.leagueoflegends.com takes 245ms 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 238ms 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.leagueoflegends.com takes 229ms 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
56% of www.leagueoflegends.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