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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

637 ms

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

1.20 s

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

0 ms

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

0.002

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

949 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.21 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
14
8 PASS 3 REVIEW 1 FIX
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 (461.1 KiB of 461.2 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Image Optimization
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 158 KB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
582ms total JS execution
REVIEW
582ms total JS execution
Info::
Unattributable: 200ms CPU time
Info::
https://archive.org/offshoot_assets/index-BKCjiuEw...: 143ms CPU time
Info::
https://archive.org/: 121ms CPU time
Info::
https://archive.org/offshoot_assets/sentry-AjyKTUQ...: 119ms CPU time
Warning::
Third-party scripts: 582ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 32% Style & Layout 17% Rendering 7%
ScriptTotalScriptingParse/CompileParty
Unattributable200ms81ms0ms3rd
https://archive.org/offshoot_assets/index-BKCjiuEw.js143ms88ms0ms3rd
https://archive.org/121ms1ms0ms3rd
https://archive.org/offshoot_assets/sentry-AjyKTUQ5.js119ms49ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
461 KB transferred, 97 requests
PASS
461 KB transferred, 97 requests
Info::
Page weighs 786 KB (461 KB transferred)
Info::
97 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
461 KB / 2.4 MB budget
461 KB transferred
97 requests
0.09 g CO2 per page load
JavaScript 279.7 KiB 61%
Images 157.9 KiB 34%
Other 12.8 KiB 3%
Other 5.6 KiB 1%
HTML 2.7 KiB 1%
CSS 2.2 KiB 0%
Other 243 B 0%
0 2.4 MB 4.9 MB
Under budget
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
50 scripts, 0 KB unused
PASS
50 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://archive.org/offshoot_assets/vendor/lit/polyfill-support.js3 KB—✓3rd
https://archive.org/offshoot_assets/vendor/@webcomponents/webcomponentsjs@2.6.0/webcomponents-loader.js4 KB—✓3rd
https://archive.org/offshoot_assets/index-BKCjiuEw.js70 KB—✓3rd
https://apollo.archive.org/js/container_ZUUaFed2.js0 KB—✓3rd
https://archive.org/offshoot_assets/psa-banners-G6Z4k0QP.js3 KB—✓3rd
https://archive.org/offshoot_assets/unsafe-html-CelpaV-L.js2 KB—✓3rd
https://archive.org/offshoot_assets/alert-banner-D2BRqaIF.js3 KB—✓3rd
https://archive.org/offshoot_assets/index-CYdTJDUh.js10 KB—✓3rd
https://archive.org/offshoot_assets/icon-close-DRmpp7Bp.js2 KB—✓3rd
https://archive.org/offshoot_assets/app-services-pRY3c-3K.js4 KB—✓3rd
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
HTTP Caching
max-age=21600 (6 hours)
PASS
max-age=21600 (6 hours)
Info::
Cache-Control header is set
Got: max-age=21600
Info::
Effective TTL: 6 hours (max-age=21600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=21600

DirectiveValueMeaning
max-age21600Cache for 6 hours
Effective TTL: 21600 seconds
Network Waterfall
97 requests over 0ms
INFO

Performance analysis not available for this result.

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 582ms · 111KB · $8/mo
Unattributable
Other
Optional
Execution 200ms
Transfer 0 KB
Monthly Cost $3/mo
archive.org
Other
Optional
Execution 143ms
Transfer 70 KB
Monthly Cost $2/mo
archive.org
Other
Optional
Execution 121ms
Transfer 3 KB
Monthly Cost $2/mo
archive.org
Other
Optional
Execution 119ms
Transfer 38 KB
Monthly Cost $2/mo

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

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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