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.
941 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.14 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
33 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.
1.08 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.
2.14 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction16 scripts, 332 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/pages/_app-353943c195caf1f1.js | 250 KB | 147 KB (59%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DWCCJLKX3X | 173 KB | 64 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KDVRCT5 | 127 KB | 62 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-796001856&cx=c>m=4e64e1h1 | 149 KB | 58 KB (39%) | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/main-83950604a31ac5bb.js | 31 KB | — | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/7792.f845f4f2c2ed5c7d.js | 4 KB | — | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/webpack-972a469c9ff8edaf.js | 6 KB | — | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/framework-3412d1150754b2fb.js | 42 KB | — | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/1119.ecfb8447af8524c5.js | 2 KB | — | ✓ | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/3914.951f46ff700fc404.js | 22 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
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.2 MB transferred, 47 requestsREVIEW
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
CImage OptimizationAction17 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
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
BPage Weight Inventory47 resources · 1.2 MB · 332 KB savings availableREVIEW
~331.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 47 resources | 1.2 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+JS Execution Cost479ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.geeksforgeeks.org/ | 180ms | 35ms | 0ms | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/pages/_app-353943c195caf1f1.js | 89ms | 58ms | 15ms | 3rd |
| Unattributable | 77ms | 2ms | 0ms | 3rd |
| https://assets.geeksforgeeks.org/gfg-assets/_next/static/chunks/framework-3412d1150754b2fb.js | 68ms | 61ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-796001856&cx=c>m=4e64e1h1 | 65ms | 55ms | 9ms | 3rd |
A+Font Loading2 fonts (66 KB)PASS
Web fonts
2
66 KB total
Render-blocking
0
of 2
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
Network Waterfall47 requests over 877msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.geeksforgeeks.org www.geeksforgeeks.org | Other | 180ms | 30 KB | — | €3/mo | Optional |
assets.geeksforgeeks.org assets.geeksforgeeks.org | Other | 89ms | 250 KB | 59% | €1/mo | Optional |
Unattributable Unattributable | Other | 77ms | 0 KB | — | €1/mo | Optional |
assets.geeksforgeeks.org assets.geeksforgeeks.org | Other | 68ms | 42 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 65ms | 149 KB | 39% | €1/mo | Optional |
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
59% of assets.geeksforgeeks.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