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.
4.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.58 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.88 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.195
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
8.71 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.
16.22 s
Page Load Progression
FPage Weight BudgetAction5.4 MB transferred, 99 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
FJS Execution CostAction11089ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9794-578107f4009089b0.js | 2881ms | 1840ms | 69ms | 3rd |
| https://www.unrealengine.com/ | 1862ms | 145ms | 39ms | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2d1400c4.50f948daff49770f.js | 1455ms | 523ms | 41ms | 3rd |
| Unattributable | 1116ms | 44ms | 0ms | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2741-85bb0f56237455db.js | 631ms | 142ms | 54ms | 3rd |
| https://www.unrealengine.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 465ms | 450ms | 3ms | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/626-657cb2a4573622b9.js | 463ms | 396ms | 45ms | 3rd |
| https://components.unrealengine.com/navigation/navigation-CVNzITGf.mjs | 461ms | 386ms | 3ms | 3rd |
| https://js.hcaptcha.com/1/api.js?render=explicit&uj=true | 294ms | 235ms | 39ms | 3rd |
| https://components.unrealengine.com/footer/lit-shared-CfJu2WdS.mjs | 279ms | 238ms | 1ms | 3rd |
Showing top 10 of 18 scripts
DJS BundlesAction47 scripts, 254 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2741-85bb0f56237455db.js | 110 KB | 69 KB (62%) | ✓ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2d1400c4.50f948daff49770f.js | 71 KB | 46 KB (65%) | ✓ | 3rd |
| https://components.unrealengine.com/navigation/navigation-CVNzITGf.mjs | 88 KB | 41 KB (47%) | ✗ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/626-657cb2a4573622b9.js | 83 KB | 38 KB (46%) | ✓ | 3rd |
| https://js.hcaptcha.com/1/api.js?render=explicit&uj=true | 86 KB | 35 KB (41%) | ✓ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6808-a0e238cc2605d3e6.js | 40 KB | 26 KB (66%) | ✓ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/app/%5Blang%5D/layout-9cb807fab47e56de.js | 5 KB | — | ✓ | 3rd |
| https://www.unrealengine.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? | 11 KB | — | ✓ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/main-app-625fde702452bc72.js | 1 KB | — | ✓ | 3rd |
| https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/3578-7bd2a3b504bf18ea.js | 31 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
DPage Weight InventoryAction99 resources · 5.4 MB · 254 KB savings availableFIX
~253.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 99 resources | 5.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization21 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 Loading5 fonts (495 KB)PASS
Web fonts
5
495 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~175 KB and ~350 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall99 requests over 4827msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.unrealengine.com assets.unrealengine.com | Other | 2881ms | 42 KB | — | $38/mo | Costly |
www.unrealengine.com www.unrealengine.com | Other | 1862ms | 46 KB | — | $25/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 1455ms | 71 KB | 65% | $19/mo | Costly |
Unattributable Unattributable | Other | 1116ms | 0 KB | — | $15/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 631ms | 110 KB | 62% | $8/mo | Costly |
www.unrealengine.com www.unrealengine.com | Other | 465ms | 0 KB | — | $6/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 463ms | 83 KB | 46% | $6/mo | Costly |
components.unrealengine.com components.unrealengine.com | Other | 461ms | 88 KB | 47% | $6/mo | Costly |
js.hcaptcha.com js.hcaptcha.com | Other | 294ms | 86 KB | 41% | $4/mo | Costly |
components.unrealengine.com components.unrealengine.com | Other | 279ms | 9 KB | — | $4/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 226ms | 23 KB | — | $3/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 220ms | 156 KB | — | $3/mo | Costly |
assets.unrealengine.com assets.unrealengine.com | Other | 186ms | 61 KB | — | $2/mo | Optional |
assets.unrealengine.com assets.unrealengine.com | Other | 164ms | 3 KB | — | $2/mo | Optional |
assets.unrealengine.com assets.unrealengine.com | Other | 125ms | 51 KB | — | $2/mo | Optional |
assets.unrealengine.com assets.unrealengine.com | Other | 112ms | 3 KB | — | $1/mo | Optional |
assets.unrealengine.com assets.unrealengine.com | Other | 88ms | 1 KB | — | $1/mo | Optional |
assets.unrealengine.com assets.unrealengine.com | Other | 63ms | 6 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- assets.unrealengine.com adds 2881ms and costs ~$38/month
- www.unrealengine.com adds 1862ms and costs ~$25/month
- assets.unrealengine.com adds 1455ms and costs ~$19/month
- Unattributable adds 1116ms and costs ~$15/month
- assets.unrealengine.com adds 631ms and costs ~$8/month
- www.unrealengine.com adds 465ms and costs ~$6/month
- assets.unrealengine.com adds 463ms and costs ~$6/month
- components.unrealengine.com adds 461ms and costs ~$6/month
- js.hcaptcha.com adds 294ms and costs ~$4/month
- components.unrealengine.com adds 279ms and costs ~$4/month
- assets.unrealengine.com adds 226ms and costs ~$3/month
- assets.unrealengine.com adds 220ms 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
assets.unrealengine.com takes 2881ms 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.unrealengine.com takes 1862ms 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
assets.unrealengine.com takes 1455ms 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 assets.unrealengine.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
Unattributable takes 1116ms 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
assets.unrealengine.com takes 631ms 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
62% of assets.unrealengine.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.unrealengine.com takes 465ms 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
assets.unrealengine.com takes 463ms 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
components.unrealengine.com takes 461ms 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
js.hcaptcha.com takes 294ms 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
components.unrealengine.com takes 279ms 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
assets.unrealengine.com takes 226ms 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
assets.unrealengine.com takes 220ms 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