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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
44
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
73
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.

6.09 s

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

6.09 s

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

562 ms

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

0.094

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

7.69 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.

10.09 s

Page Load Progression

811 ms
1.6 s
2.4 s
3.2 s
4.1 s
4.9 s
5.7 s
6.5 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 63 requests
FIX
4.8 MB transferred, 63 requests
Critical::
Page weighs 6.1 MB (4.8 MB transferred)
Warning::
Images are 4.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.1 MB
Warning::
JavaScript is 580 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 580 KB
Info::
63 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
63 requests
1.0 g CO2 per page load
Images 4.1 MiB 85%
JavaScript 580.3 KiB 12%
CSS 72.1 KiB 1%
HTML 35.3 KiB 1%
Fonts 28.7 KiB 1%
Other 26.4 KiB 1%
Other 4.5 KiB 0%
Other 242 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
5921ms total JS execution
FIX
5921ms total JS execution
Warning::
https://web-static.archive.org/_static/waybackjs/v...: 2885ms CPU time
Warning::
https://web.archive.org/: 1517ms CPU time
Warning::
Unattributable: 639ms CPU time
Warning::
https://web-static.archive.org/_static/waybackjs/m...: 445ms CPU time
Warning::
https://archive.org/includes/build/js/archive.min....: 363ms CPU time
Warning::
Third-party scripts: 4404ms (74% of total)

Main Thread Breakdown

Script Evaluation 32% Other 27% Rendering 20% Style & Layout 14% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://web-static.archive.org/_static/waybackjs/vendors~main.5c55ac5c0b4418a2bfaf.js2885ms1118ms98ms3rd
https://web.archive.org/1517ms29ms7ms1st
Unattributable639ms16ms0ms3rd
https://web-static.archive.org/_static/waybackjs/main.e7b2354c86916e40324f.js445ms422ms20ms3rd
https://archive.org/includes/build/js/archive.min.js?v=dd67c3ca363ms224ms128ms3rd
https://archive.org/components/npm/@webcomponents/webcomponentsjs/webcomponents-bundle.js?v=dd67c3ca72ms48ms23ms3rd
D
JS Bundles
Action
14 scripts, 338 KB unused
FIX
14 scripts, 338 KB unused
Warning::
https://archive.org/includes/build/js/archive.min....: 192 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web-static.archive.org/_static/waybackjs/v...: 93 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://archive.org/components/npm/@webcomponents/...: 31 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web-static.archive.org/_static/waybackjs/m...: 21 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 338 KB
338 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://archive.org/includes/build/js/archive.min.js?v=dd67c3ca235 KB192 KB (82%)✓3rd
https://web-static.archive.org/_static/waybackjs/vendors~main.5c55ac5c0b4418a2bfaf.js213 KB93 KB (44%)✓3rd
https://archive.org/components/npm/@webcomponents/webcomponentsjs/webcomponents-bundle.js?v=dd67c3ca42 KB31 KB (76%)✓3rd
https://web-static.archive.org/_static/waybackjs/main.e7b2354c86916e40324f.js41 KB21 KB (52%)✓3rd
https://archive.org/includes/build/js/ia-topnav.min.js?v=dd67c3ca6 KB—✓3rd
https://archive.org/components/npm/lit/polyfill-support.js?v=dd67c3ca3 KB—✓3rd
https://web-static.archive.org/_static/js/ui.js?v=7LYlZ-C21 KB—✓3rd
https://web-static.archive.org/_static/waybackjs/runtime.70559ba0c42caadaa575.js3 KB—✓3rd
https://archive.org/includes/apollo.js?v=dd67c3ca2 KB—✓3rd
https://archive.org/includes/athena.js?v=dd67c3ca6 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

D
Page Weight Inventory
Action
63 resources · 4.8 MB · 338 KB savings available
FIX
63 resources · 4.8 MB · 338 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~338 KB of savings available
Warning::
61 third-party resources (99% of weight)
Info::
3 resources over 200KB
63 resources · 4.8 MiB · 61 third-party 3.8 MiB over 1MB target
Image 85% · 4.1 MiB
JavaScript 12% · 580.3 KiB
CSS 1% · 72.1 KiB
Document 1% · 35.3 KiB
Font 1% · 28.7 KiB
Other 1% · 26.4 KiB

~337.5 KiB of savings available

Remove unused JavaScript: 337.5 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.

C
Image Optimization
Action
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web-static.archive.org/_static/waybackjs/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
37 images 4.1 MB
0 oversized -0 KB
35 legacy format
33 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
1 fonts (29 KB)
PASS
1 fonts (29 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

29 KB total

Render-blocking

0

of 1

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 4.0 s 5.0 s 6.0 s FCP 6.1 s LCP 6.1 shttps://archive.org/includes/fonts/Iconochive-Regular.woffIconochive-Regular.woff https://archive.org/includes/fonts/Iconochive-Regular.woff — 28.7 KiB — 1.1 s — font-display: swap
Iconochive-Regular.woff woff swap
Size 29 KB
Load time 1.1 s
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~9 KB and ~18 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
63 requests over 4159ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 6.1 s LCP 6.1 shttps://web.archive.org// https://web.archive.org/ — 200 — 35.3 KiB — 571 ms — h2https://archive.org/includes/athena.js?v=dd67c3caarchive.org/includes/athena.js?v=dd... https://archive.org/includes/athena.js?v=dd67c3ca — 200 — 6.4 KiB — 1.5 s — h2https://archive.org/includes/apollo.js?v=dd67c3caarchive.org/includes/apollo.js?v=dd... https://archive.org/includes/apollo.js?v=dd67c3ca — 200 — 1.7 KiB — 1.7 s — h2https://archive.org/components/npm/lit/polyfill-support.js?v=dd67c3caarchive.org/components/npm/lit/poly... https://archive.org/components/npm/lit/polyfill-support.js?v=dd67c3ca — 200 — 2.8 KiB — 1.7 s — h2https://archive.org/components/npm/@webcomponents/webcomponentsjs/webcomponents-bundle.js?v=dd67c3caarchive.org/components/npm/@webcomp... https://archive.org/components/npm/@webcomponents/webcomponentsjs/webcomponents-bundle.js?v=dd67c3ca — 200 — 41.7 KiB — 1.7 s — h2https://archive.org/includes/build/js/ia-topnav.min.js?v=dd67c3caarchive.org/includes/build/js/ia-to... https://archive.org/includes/build/js/ia-topnav.min.js?v=dd67c3ca — 200 — 5.7 KiB — 1.5 s — h2https://archive.org/includes/build/js/archive.min.js?v=dd67c3caarchive.org/includes/build/js/archi... https://archive.org/includes/build/js/archive.min.js?v=dd67c3ca — 200 — 234.7 KiB — 1.8 s — h2https://archive.org/includes/build/css/archive.min.css?v=dd67c3caarchive.org/includes/build/css/arch... https://archive.org/includes/build/css/archive.min.css?v=dd67c3ca — 200 — 57.0 KiB — 1.5 s — h2https://web-static.archive.org/_static/css/styles.css?v=HdpcXpRmweb-static.archive.org/_static/css/... https://web-static.archive.org/_static/css/styles.css?v=HdpcXpRm — 200 — 1.8 KiB — 421 ms — h2https://web-static.archive.org/_static/js/ui.js?v=7LYlZ-C2web-static.archive.org/_static/js/u... https://web-static.archive.org/_static/js/ui.js?v=7LYlZ-C2 — 200 — 753 B — 830 ms — 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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
74% of JavaScript execution is third-party
First-party Third-party 4404ms · 531KB · $58/mo
web-static.archive.org
Other
Costly
Execution 2885ms
Transfer 213 KB
Unused 44%
Monthly Cost $38/mo
Unattributable
Other
Costly
Execution 639ms
Transfer 0 KB
Monthly Cost $8/mo
web-static.archive.org
Other
Costly
Execution 445ms
Transfer 41 KB
Unused 52%
Monthly Cost $6/mo
archive.org
Other
Costly
Execution 363ms
Transfer 235 KB
Unused 82%
Monthly Cost $5/mo
archive.org
Other
Optional
Execution 72ms
Transfer 42 KB
Unused 76%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • web-static.archive.org adds 2885ms and costs ~$38/month
  • Unattributable adds 639ms and costs ~$8/month
  • web-static.archive.org adds 445ms and costs ~$6/month
  • archive.org adds 363ms and costs ~$5/month

74% 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

web-static.archive.org takes 2885ms 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 639ms 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

web-static.archive.org takes 445ms 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

52% of web-static.archive.org'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

archive.org takes 363ms 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

82% of archive.org'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

76% of archive.org'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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