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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.00 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.50 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

438 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.226

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.49 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.

4.27 s

Page Load Progression

825 ms
1.6 s
2.5 s
3.3 s
4.1 s
4.9 s
5.8 s
6.6 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
6.1 MB transferred, 90 requests
FIX
6.1 MB transferred, 90 requests
Critical::
Page weighs 10.4 MB (6.1 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 495 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 495 KB
Info::
90 HTTP requests
Info::
Estimated 1.3 g CO2 per page load
6.1 MB / 2.4 MB budget
6.1 MB transferred
90 requests
1.3 g CO2 per page load
Other 4.0 MiB 65%
JavaScript 1.1 MiB 17%
Fonts 495.3 KiB 8%
Images 464.6 KiB 7%
CSS 50.2 KiB 1%
HTML 46.3 KiB 1%
Other 37.8 KiB 1%
Other 5.1 KiB 0%
Other 3.7 KiB 0%
Other 874 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (6.1 MiB of 6.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2407ms total JS execution
FIX
2407ms total JS execution
Warning::
https://assets.unrealengine.com/unrealengine-websi...: 729ms CPU time
Warning::
https://www.unrealengine.com/: 404ms CPU time
Warning::
Unattributable: 276ms CPU time
Info::
https://assets.unrealengine.com/unrealengine-websi...: 204ms CPU time
Info::
https://components.unrealengine.com/navigation/nav...: 137ms CPU time
Warning::
Third-party scripts: 2407ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 19% Style & Layout 10% Parse HTML & CSS 10% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9794-578107f4009089b0.js729ms470ms22ms3rd
https://www.unrealengine.com/404ms39ms12ms3rd
Unattributable276ms11ms0ms3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2d1400c4.50f948daff49770f.js204ms61ms9ms3rd
https://components.unrealengine.com/navigation/navigation-CVNzITGf.mjs137ms103ms1ms3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9714b509-5c6c67219b993c92.js125ms111ms6ms3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/626-657cb2a4573622b9.js120ms89ms12ms3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2741-85bb0f56237455db.js111ms25ms14ms3rd
https://www.unrealengine.com/cdn-cgi/challenge-platform/scripts/jsd/main.js110ms107ms1ms3rd
https://js.hcaptcha.com/1/api.js?render=explicit&uj=true74ms60ms11ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
47 scripts, 253 KB unused
FIX
47 scripts, 253 KB unused
Warning::
https://assets.unrealengine.com/unrealengine-websi...: 69 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.unrealengine.com/unrealengine-websi...: 46 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://components.unrealengine.com/navigation/nav...: 40 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://components.unrealengine.com/navigation/nav...: unminified — 13 KB could be saved
Warning::
https://assets.unrealengine.com/unrealengine-websi...: 38 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.hcaptcha.com/1/api.js?render=explicit&u...: 35 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 253 KB
253 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2741-85bb0f56237455db.js110 KB69 KB (62%)✓3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2d1400c4.50f948daff49770f.js71 KB46 KB (65%)✓3rd
https://components.unrealengine.com/navigation/navigation-CVNzITGf.mjs88 KB40 KB (46%)✗3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/626-657cb2a4573622b9.js83 KB38 KB (46%)✓3rd
https://js.hcaptcha.com/1/api.js?render=explicit&uj=true86 KB35 KB (41%)✓3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6808-a0e238cc2605d3e6.js40 KB26 KB (66%)✓3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/app/%5Blang%5D/layout-9cb807fab47e56de.js5 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.js1 KB—✓3rd
https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/3578-7bd2a3b504bf18ea.js31 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
90 resources · 6.1 MB · 253 KB savings available
FIX
90 resources · 6.1 MB · 253 KB savings available
Warning::
Page weight 5.1 MB over 1MB target
Got: 6.1 MB Expected: ≤ 1 MB
Info::
~253 KB of savings available
Warning::
89 third-party resources (100% of weight)
Info::
1 resources over 200KB
90 resources · 6.1 MiB · 89 third-party 5.1 MiB over 1MB target
Media 65% · 4.0 MiB
JavaScript 17% · 1.1 MiB
Font 8% · 495.3 KiB
Image 7% · 468.8 KiB
CSS 1% · 50.2 KiB
Document 1% · 46.4 KiB
Other 1% · 43.2 KiB

~253.5 KiB of savings available

Remove unused JavaScript: 253.5 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 465 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (495 KB)
PASS
5 fonts (495 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

495 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.0 s LCP 3.5 shttps://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.8 KiB — 329 ms — font-display: swaphttps://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Regular.f1f0c35b.woff2Inter-Regular.f1f0c35b.... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Regular.f1f0c35b.woff2 — 97.1 KiB — 97 ms — font-display: swaphttps://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/InterTight-Bold.fb15a343.woff2InterTight-Bold.fb15a34... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/InterTight-Bold.fb15a343.woff2 — 142.2 KiB — 92 ms — font-display: swaphttps://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Medium.dc792b50.woff2Inter-Medium.dc792b50.w... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Medium.dc792b50.woff2 — 104.0 KiB — 127 ms — font-display: swaphttps://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Bold.579e0f95.woff2Inter-Bold.579e0f95.woff2 https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/Inter-Bold.579e0f95.woff2 — 104.2 KiB — 146 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 329 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
Inter-Regular.f1f0c35b.... woff2 swap
Size 97 KB
Load time 97 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
InterTight-Bold.fb15a34... woff2 swap
Size 142 KB
Load time 92 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Medium.dc792b50.w... woff2 swap
Size 104 KB
Load time 127 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-Bold.579e0f95.woff2 woff2 swap
Size 104 KB
Load time 146 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • 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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
90 requests over 4547ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 3.5 shttps://unrealengine.com// https://unrealengine.com/ — 301 — 89 B — 803 ms — h2https://www.unrealengine.com/www.unrealengine.com/ https://www.unrealengine.com/ — 200 — 46.3 KiB — 556 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/e4af272ccee01ff0-s.p.woff2assets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.8 KiB — 329 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/d9f646d85cc0293c.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/d9f646d85cc0293c.css — 200 — 3.9 KiB — 266 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/8a78239d3e4a8ca8.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/8a78239d3e4a8ca8.css — 200 — 31.3 KiB — 295 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/ca237b50d93ef97e.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/ca237b50d93ef97e.css — 200 — 4.1 KiB — 301 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/244883c16d949566.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/244883c16d949566.css — 200 — 1.0 KiB — 302 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/60b5639ba8648e33.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/60b5639ba8648e33.css — 200 — 6.5 KiB — 305 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/17d52ea3aee3a1ab.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/17d52ea3aee3a1ab.css — 200 — 1.4 KiB — 302 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/b2b2512a56f60e4d.cssassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/css/b2b2512a56f60e4d.css — 200 — 1.3 KiB — 305 ms — h2https://components.unrealengine.com/navigation/unrealengine-navigation.mjscomponents.unrealengine.com/navigat... https://components.unrealengine.com/navigation/unrealengine-navigation.mjs — 200 — 19.3 KiB — 79 ms — h2https://components.unrealengine.com/footer/unrealengine-footer.mjscomponents.unrealengine.com/footer/... https://components.unrealengine.com/footer/unrealengine-footer.mjs — 200 — 10.7 KiB — 77 ms — h2https://components.unrealengine.com/styles/navigation.csscomponents.unrealengine.com/styles/... https://components.unrealengine.com/styles/navigation.css — 200 — 838 B — 75 ms — h2https://cms-assets.unrealengine.com/AiKUh5PQCTaOFnmJDZJBfz/resize=width:1200/output=format:webp/oXIAOr5gQny2cAfPpq02cms-assets.unrealengine.com/AiKUh5P... https://cms-assets.unrealengine.com/AiKUh5PQCTaOFnmJDZJBfz/resize=width:1200/output=format:webp/oXIAOr5gQny2cAfPpq02 — 200 — 66.2 KiB — 118 ms — h2https://tracking.unrealengine.com/tracking.js?l=en-US&version=0565f0297854bfde1ae01296c9c1eeefef2cdf98tracking.unrealengine.com/tracking.... https://tracking.unrealengine.com/tracking.js?l=en-US&version=0565f0297854bfde1ae01296c9c1eeefef2cdf98 — 302 — 540 B — 1.1 s — h2https://js.hcaptcha.com/1/api.js?render=explicit&uj=truejs.hcaptcha.com/1/api.js?render=exp... https://js.hcaptcha.com/1/api.js?render=explicit&uj=true — 200 — 86.0 KiB — 40 ms — h3https://www.unrealengine.com/cosmos/static/favicons/site.webmanifestwww.unrealengine.com/cosmos/static/... https://www.unrealengine.com/cosmos/static/favicons/site.webmanifest — 200 — 3.7 KiB — 301 ms — h3https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/webpack-87a50a82faf3305d.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/webpack-87a50a82faf3305d.js — 200 — 3.0 KiB — 58 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9714b509-5c6c67219b993c92.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9714b509-5c6c67219b993c92.js — 200 — 51.2 KiB — 129 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9794-578107f4009089b0.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9794-578107f4009089b0.js — 200 — 41.9 KiB — 74 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/main-app-625fde702452bc72.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/main-app-625fde702452bc72.js — 200 — 910 B — 77 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6078-ea6b2b9d3086e007.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6078-ea6b2b9d3086e007.js — 200 — 11.0 KiB — 80 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6808-a0e238cc2605d3e6.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/6808-a0e238cc2605d3e6.js — 200 — 39.8 KiB — 101 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/3578-7bd2a3b504bf18ea.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/3578-7bd2a3b504bf18ea.js — 200 — 31.0 KiB — 111 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9944-66d300f5aaf38e0f.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/9944-66d300f5aaf38e0f.js — 200 — 2.4 KiB — 112 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2664-55d94c07d2ee0f58.jsassets.unrealengine.com/unrealengin... https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/2664-55d94c07d2ee0f58.js — 200 — 23.5 KiB — 119 ms — h2https://assets.unrealengine.com/unrealengine-website-53d1175/_next/static/chunks/app/global-error-ef094185a0995f32.jsassets.unrealengine.com/unrealengin... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2407ms · 742KB · $32/mo
assets.unrealengine.com
Other
Costly
Execution 729ms
Transfer 42 KB
Monthly Cost $10/mo
www.unrealengine.com
Other
Costly
Execution 404ms
Transfer 46 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 276ms
Transfer 0 KB
Monthly Cost $4/mo
assets.unrealengine.com
Other
Costly
Execution 204ms
Transfer 71 KB
Unused 65%
Monthly Cost $3/mo
components.unrealengine.com
Other
Optional
Execution 137ms
Transfer 88 KB
Unused 46%
Monthly Cost $2/mo
assets.unrealengine.com
Other
Optional
Execution 125ms
Transfer 51 KB
Monthly Cost $2/mo
assets.unrealengine.com
Other
Optional
Execution 120ms
Transfer 83 KB
Unused 46%
Monthly Cost $2/mo
assets.unrealengine.com
Other
Optional
Execution 111ms
Transfer 110 KB
Unused 62%
Monthly Cost $1/mo
www.unrealengine.com
Other
Optional
Execution 110ms
Transfer 0 KB
Monthly Cost $1/mo
js.hcaptcha.com
Other
Optional
Execution 74ms
Transfer 86 KB
Unused 41%
Monthly Cost $1/mo
assets.unrealengine.com
Other
Optional
Execution 60ms
Transfer 156 KB
Monthly Cost $1/mo
components.unrealengine.com
Other
Optional
Execution 58ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • assets.unrealengine.com adds 729ms and costs ~$10/month
  • www.unrealengine.com adds 404ms and costs ~$5/month
  • Unattributable adds 276ms and costs ~$4/month
  • assets.unrealengine.com adds 204ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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 729ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.unrealengine.com takes 404ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 276ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

assets.unrealengine.com takes 204ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

62% of assets.unrealengine.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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