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https://lobste.rs

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
96
GRADE
A
FIX
0
REVIEW
4
PASS
11
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
91
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.

981 ms

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

1.13 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.

0.000

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

3.83 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.

1.13 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
11 PASS 4 REVIEW
B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 44 KB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
584ms total JS execution
REVIEW
584ms total JS execution
Warning::
Unattributable: 325ms CPU time
Warning::
https://lobste.rs/: 259ms CPU time
Warning::
Third-party scripts: 325ms (56% of total)

Main Thread Breakdown

Other 58% Style & Layout 22% Parse HTML & CSS 9% Rendering 6% Script Evaluation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable325ms8ms0ms3rd
https://lobste.rs/259ms23ms1ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
A+
Page Weight Budget
74 KB transferred, 36 requests
PASS
74 KB transferred, 36 requests
Info::
Page weighs 169 KB (74 KB transferred)
Info::
36 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
74 KB / 2.4 MB budget
74 KB transferred
36 requests
0.02 g CO2 per page load
Images 43.7 KiB 59%
CSS 18.7 KiB 25%
HTML 9.7 KiB 13%
Other 1.4 KiB 2%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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
36 resources · 74 KB · 0 KB savings available
PASS
36 resources · 74 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 74 KB
36 resources · 73.6 KiB · 0 third-party Within 1MB page-weight target
Image 61% · 45.2 KiB
CSS 25% · 18.7 KiB
Document 13% · 9.7 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
Network Waterfall
36 requests over 1594ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 981 ms LCP 1.1 shttps://lobste.rs// https://lobste.rs/ — 200 — 9.7 KiB — 289 ms — h2https://lobste.rs/assets/application-27162bd9.css/assets/application-27162bd9.css https://lobste.rs/assets/application-27162bd9.css — 200 — 11.3 KiB — 84 ms — h2https://lobste.rs/assets/system-system-fd030c9d.css/assets/system-system-fd030c9d.css https://lobste.rs/assets/system-system-fd030c9d.css — 200 — 491 B — 82 ms — h2https://lobste.rs/assets/tom-select-00e8031d.css/assets/tom-select-00e8031d.css https://lobste.rs/assets/tom-select-00e8031d.css — 200 — 2.7 KiB — 82 ms — h2https://lobste.rs/assets/TomSelect_remove_button-4d5c34b9.css/assets/TomSelect_remove_button-4d5... https://lobste.rs/assets/TomSelect_remove_button-4d5c34b9.css — 200 — 527 B — 82 ms — h2https://lobste.rs/assets/light-normal-bf538ff1.css/assets/light-normal-bf538ff1.css https://lobste.rs/assets/light-normal-bf538ff1.css — 200 — 968 B — 85 ms — h3https://lobste.rs/assets/light-high-56dfc432.css/assets/light-high-56dfc432.css https://lobste.rs/assets/light-high-56dfc432.css — 200 — 939 B — 80 ms — h3https://lobste.rs/assets/dark-normal-b6128952.css/assets/dark-normal-b6128952.css https://lobste.rs/assets/dark-normal-b6128952.css — 200 — 984 B — 81 ms — h3https://lobste.rs/assets/dark-high-dd12f301.css/assets/dark-high-dd12f301.css https://lobste.rs/assets/dark-high-dd12f301.css — 200 — 952 B — 77 ms — h3https://lobste.rs/assets/logo-transparent-e4f2f8b4.svg/assets/logo-transparent-e4f2f8b4.s... https://lobste.rs/assets/logo-transparent-e4f2f8b4.svg — 200 — 1.2 KiB — 75 ms — h3https://lobste.rs/favicon.ico/favicon.ico https://lobste.rs/favicon.ico — 200 — 1.4 KiB — 75 ms — h3https://lobste.rs/avatars/ltratt-32.png/avatars/ltratt-32.png https://lobste.rs/avatars/ltratt-32.png — 200 — 1.3 KiB — 78 ms — h3https://lobste.rs/avatars/bugsmith-32.png/avatars/bugsmith-32.png https://lobste.rs/avatars/bugsmith-32.png — 200 — 2.1 KiB — 78 ms — h3https://lobste.rs/avatars/jfred-32.png/avatars/jfred-32.png https://lobste.rs/avatars/jfred-32.png — 200 — 2.8 KiB — 85 ms — h3https://lobste.rs/avatars/milkcanworld-32.png/avatars/milkcanworld-32.png https://lobste.rs/avatars/milkcanworld-32.png — 200 — 3.0 KiB — 147 ms — h3https://lobste.rs/avatars/linkdd-32.png/avatars/linkdd-32.png https://lobste.rs/avatars/linkdd-32.png — 200 — 1.4 KiB — 89 ms — h3https://lobste.rs/avatars/tsg-32.png/avatars/tsg-32.png https://lobste.rs/avatars/tsg-32.png — 200 — 1.4 KiB — 100 ms — h3https://lobste.rs/avatars/vpol-32.png/avatars/vpol-32.png https://lobste.rs/avatars/vpol-32.png — 200 — 2.1 KiB — 101 ms — h3https://lobste.rs/avatars/zmitchell-32.png/avatars/zmitchell-32.png https://lobste.rs/avatars/zmitchell-32.png — 200 — 704 B — 101 ms — h3https://lobste.rs/avatars/LAC-Tech-32.png/avatars/LAC-Tech-32.png https://lobste.rs/avatars/LAC-Tech-32.png — 200 — 1.0 KiB — 118 ms — h3https://lobste.rs/avatars/krig-32.png/avatars/krig-32.png https://lobste.rs/avatars/krig-32.png — 200 — 2.4 KiB — 119 ms — h3https://lobste.rs/avatars/technetium-32.png/avatars/technetium-32.png https://lobste.rs/avatars/technetium-32.png — 200 — 813 B — 108 ms — h3https://lobste.rs/avatars/Corbin-32.png/avatars/Corbin-32.png https://lobste.rs/avatars/Corbin-32.png — 200 — 1.9 KiB — 121 ms — h3https://lobste.rs/avatars/jmelesky-32.png/avatars/jmelesky-32.png https://lobste.rs/avatars/jmelesky-32.png — 200 — 1.1 KiB — 121 ms — h3https://lobste.rs/avatars/eBPF-32.png/avatars/eBPF-32.png https://lobste.rs/avatars/eBPF-32.png — 200 — 610 B — 121 ms — h3https://lobste.rs/avatars/intarga-32.png/avatars/intarga-32.png https://lobste.rs/avatars/intarga-32.png — 200 — 1003 B — 116 ms — h3https://lobste.rs/avatars/amoroso-32.png/avatars/amoroso-32.png https://lobste.rs/avatars/amoroso-32.png — 200 — 1.2 KiB — 117 ms — h3https://lobste.rs/avatars/calvin-32.png/avatars/calvin-32.png https://lobste.rs/avatars/calvin-32.png — 200 — 1.5 KiB — 118 ms — h3https://lobste.rs/avatars/uncenter-32.png/avatars/uncenter-32.png https://lobste.rs/avatars/uncenter-32.png — 200 — 2.7 KiB — 136 ms — h3https://lobste.rs/avatars/eregon-32.png/avatars/eregon-32.png https://lobste.rs/avatars/eregon-32.png — 200 — 1.2 KiB — 116 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 981 ms LCP 1.1 shttps://lobste.rs// https://lobste.rs/ — 200 — 9.7 KiB — 289 ms — h2https://lobste.rs/assets/application-27162bd9.css/assets/application-27162bd9.css https://lobste.rs/assets/application-27162bd9.css — 200 — 11.3 KiB — 84 ms — h2https://lobste.rs/assets/system-system-fd030c9d.css/assets/system-system-fd030c9d.css https://lobste.rs/assets/system-system-fd030c9d.css — 200 — 491 B — 82 ms — h2https://lobste.rs/assets/tom-select-00e8031d.css/assets/tom-select-00e8031d.css https://lobste.rs/assets/tom-select-00e8031d.css — 200 — 2.7 KiB — 82 ms — h2https://lobste.rs/assets/TomSelect_remove_button-4d5c34b9.css/assets/TomSelect_remove_button-4d5... https://lobste.rs/assets/TomSelect_remove_button-4d5c34b9.css — 200 — 527 B — 82 ms — h2https://lobste.rs/assets/light-normal-bf538ff1.css/assets/light-normal-bf538ff1.css https://lobste.rs/assets/light-normal-bf538ff1.css — 200 — 968 B — 85 ms — h3https://lobste.rs/assets/light-high-56dfc432.css/assets/light-high-56dfc432.css https://lobste.rs/assets/light-high-56dfc432.css — 200 — 939 B — 80 ms — h3https://lobste.rs/assets/dark-normal-b6128952.css/assets/dark-normal-b6128952.css https://lobste.rs/assets/dark-normal-b6128952.css — 200 — 984 B — 81 ms — h3https://lobste.rs/assets/dark-high-dd12f301.css/assets/dark-high-dd12f301.css https://lobste.rs/assets/dark-high-dd12f301.css — 200 — 952 B — 77 ms — h3https://lobste.rs/assets/logo-transparent-e4f2f8b4.svg/assets/logo-transparent-e4f2f8b4.s... https://lobste.rs/assets/logo-transparent-e4f2f8b4.svg — 200 — 1.2 KiB — 75 ms — h3https://lobste.rs/favicon.ico/favicon.ico https://lobste.rs/favicon.ico — 200 — 1.4 KiB — 75 ms — h3https://lobste.rs/avatars/ltratt-32.png/avatars/ltratt-32.png https://lobste.rs/avatars/ltratt-32.png — 200 — 1.3 KiB — 78 ms — h3https://lobste.rs/avatars/bugsmith-32.png/avatars/bugsmith-32.png https://lobste.rs/avatars/bugsmith-32.png — 200 — 2.1 KiB — 78 ms — h3https://lobste.rs/avatars/jfred-32.png/avatars/jfred-32.png https://lobste.rs/avatars/jfred-32.png — 200 — 2.8 KiB — 85 ms — h3https://lobste.rs/avatars/milkcanworld-32.png/avatars/milkcanworld-32.png https://lobste.rs/avatars/milkcanworld-32.png — 200 — 3.0 KiB — 147 ms — h3https://lobste.rs/avatars/linkdd-32.png/avatars/linkdd-32.png https://lobste.rs/avatars/linkdd-32.png — 200 — 1.4 KiB — 89 ms — h3https://lobste.rs/avatars/tsg-32.png/avatars/tsg-32.png https://lobste.rs/avatars/tsg-32.png — 200 — 1.4 KiB — 100 ms — h3https://lobste.rs/avatars/vpol-32.png/avatars/vpol-32.png https://lobste.rs/avatars/vpol-32.png — 200 — 2.1 KiB — 101 ms — h3https://lobste.rs/avatars/zmitchell-32.png/avatars/zmitchell-32.png https://lobste.rs/avatars/zmitchell-32.png — 200 — 704 B — 101 ms — h3https://lobste.rs/avatars/LAC-Tech-32.png/avatars/LAC-Tech-32.png https://lobste.rs/avatars/LAC-Tech-32.png — 200 — 1.0 KiB — 118 ms — h3https://lobste.rs/avatars/krig-32.png/avatars/krig-32.png https://lobste.rs/avatars/krig-32.png — 200 — 2.4 KiB — 119 ms — h3https://lobste.rs/avatars/technetium-32.png/avatars/technetium-32.png https://lobste.rs/avatars/technetium-32.png — 200 — 813 B — 108 ms — h3https://lobste.rs/avatars/Corbin-32.png/avatars/Corbin-32.png https://lobste.rs/avatars/Corbin-32.png — 200 — 1.9 KiB — 121 ms — h3https://lobste.rs/avatars/jmelesky-32.png/avatars/jmelesky-32.png https://lobste.rs/avatars/jmelesky-32.png — 200 — 1.1 KiB — 121 ms — h3https://lobste.rs/avatars/eBPF-32.png/avatars/eBPF-32.png https://lobste.rs/avatars/eBPF-32.png — 200 — 610 B — 121 ms — h3https://lobste.rs/avatars/intarga-32.png/avatars/intarga-32.png https://lobste.rs/avatars/intarga-32.png — 200 — 1003 B — 116 ms — h3https://lobste.rs/avatars/amoroso-32.png/avatars/amoroso-32.png https://lobste.rs/avatars/amoroso-32.png — 200 — 1.2 KiB — 117 ms — h3https://lobste.rs/avatars/calvin-32.png/avatars/calvin-32.png https://lobste.rs/avatars/calvin-32.png — 200 — 1.5 KiB — 118 ms — h3https://lobste.rs/avatars/uncenter-32.png/avatars/uncenter-32.png https://lobste.rs/avatars/uncenter-32.png — 200 — 2.7 KiB — 136 ms — h3https://lobste.rs/avatars/eregon-32.png/avatars/eregon-32.png https://lobste.rs/avatars/eregon-32.png — 200 — 1.2 KiB — 116 ms — h3https://lobste.rs/avatars/deevus-32.png/avatars/deevus-32.png https://lobste.rs/avatars/deevus-32.png — 200 — 2.4 KiB — 117 ms — h3https://lobste.rs/avatars/zk-32.png/avatars/zk-32.png https://lobste.rs/avatars/zk-32.png — 200 — 861 B — 115 ms — h3https://lobste.rs/avatars/Aks-32.png/avatars/Aks-32.png https://lobste.rs/avatars/Aks-32.png — 200 — 2.3 KiB — 135 ms — h3https://lobste.rs/avatars/ciferkey-32.png/avatars/ciferkey-32.png https://lobste.rs/avatars/ciferkey-32.png — 200 — 1.2 KiB — 116 ms — h3https://lobste.rs/avatars/snej-32.png/avatars/snej-32.png https://lobste.rs/avatars/snej-32.png — 200 — 2.8 KiB — 135 ms — h3https://lobste.rs/avatars/LesleyLai-32.png/avatars/LesleyLai-32.png https://lobste.rs/avatars/LesleyLai-32.png — 200 — 2.7 KiB — 135 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 325ms · 0KB · din464/mo
Unattributable
Other
Costly
Execution 325ms
Transfer 0 KB
Monthly Cost din464/mo

These scripts may cost more than they're worth

  • Unattributable adds 325ms and costs ~din464/month

56% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 325ms 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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