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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
0
PASS
14
INFO
2

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

Mobile Desktop
94
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.76 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.

0.061

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

2.07 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.

2.76 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
17
14 PASS 1 FIX
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 (66.2 KiB of 66.6 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
A+
Page Weight Budget
67 KB transferred, 8 requests
PASS
67 KB transferred, 8 requests
Info::
Page weighs 69 KB (67 KB transferred)
Info::
8 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
67 KB / 2.4 MB budget
67 KB transferred
8 requests
0.01 g CO2 per page load
Images 51.1 KiB 77%
HTML 5.7 KiB 9%
JavaScript 4.5 KiB 7%
Other 3.9 KiB 6%
CSS 1.4 KiB 2%
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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://www.marxists.org/images/index-mobiles.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 51 KB
0 oversized -0 KB
2 legacy format
1 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

A+
JS Execution Cost
276ms total JS execution
PASS
276ms total JS execution
Info::
Unattributable: 218ms CPU time
Info::
https://www.marxists.org/index-mobiles.htm: 58ms CPU time
Warning::
Third-party scripts: 276ms (100% of total)

Main Thread Breakdown

Other 77% Style & Layout 10% Script Evaluation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable218ms8ms0ms3rd
https://www.marxists.org/index-mobiles.htm58ms5ms1ms3rd
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
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.marxists.org/admin/js/menu.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
Page Weight Inventory
8 resources · 67 KB · 0 KB savings available
PASS
8 resources · 67 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 67 KB
Warning::
7 third-party resources (99% of weight)
8 resources · 66.6 KiB · 7 third-party Within 1MB page-weight target
Image 82% · 54.6 KiB
Document 9% · 6.1 KiB
JavaScript 7% · 4.5 KiB
CSS 2% · 1.4 KiB
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

A
HTTP Caching
max-age=604800 (1 week)
PASS
max-age=604800 (1 week)
Info::
Cache-Control header is set
Got: max-age=604800
Info::
Effective TTL: 1 week (max-age=604800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=604800

DirectiveValueMeaning
max-age604800Cache for 1 week
Effective TTL: 604800 seconds
Network Waterfall
8 requests over 2558ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.0 s LCP 2.8 shttps://marxists.org// https://marxists.org/ — 301 — 390 B — 487 ms — http/1.1https://www.marxists.org/www.marxists.org/ https://www.marxists.org/ — 200 — 2.9 KiB — 904 ms — http/1.1https://www.marxists.org/admin/js/menu.jswww.marxists.org/admin/js/menu.js https://www.marxists.org/admin/js/menu.js — 200 — 4.5 KiB — 165 ms — http/1.1https://www.marxists.org/css/works-red.csswww.marxists.org/css/works-red.css https://www.marxists.org/css/works-red.css — 200 — 1.4 KiB — 328 ms — http/1.1https://www.marxists.org/images/index.jpgwww.marxists.org/images/index.jpg https://www.marxists.org/images/index.jpg — 200 — 4.0 KiB — 485 ms — http/1.1https://www.marxists.org/index-mobiles.htmwww.marxists.org/index-mobiles.htm https://www.marxists.org/index-mobiles.htm — 200 — 2.8 KiB — 471 ms — http/1.1https://www.marxists.org/images/index-mobiles.jpgwww.marxists.org/images/index-mobil... https://www.marxists.org/images/index-mobiles.jpg — 200 — 47.1 KiB — 474 ms — http/1.1https://www.marxists.org/favicon.icowww.marxists.org/favicon.ico https://www.marxists.org/favicon.ico — 200 — 3.5 KiB — 163 ms — http/1.1
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 276ms · 3KB · €3/mo
Unattributable
Other
Costly
Execution 218ms
Transfer 0 KB
Monthly Cost €2/mo
www.marxists.org
Other
Optional
Execution 58ms
Transfer 3 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 218ms and costs ~€2/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

Unattributable takes 218ms 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

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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