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https://slashdot.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
80
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

888 ms

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

1.22 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.

0.443

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

1.00 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.

1.22 s

Page Load Progression

435 ms
871 ms
1.3 s
1.7 s
2.2 s
2.6 s
3.0 s
3.5 s
Checks
15
8 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
86% third-party, 0 ms blocking
FIX
86% third-party, 0 ms blocking
Warning::
Third-party code accounts for 86% of page weight (616.9 KiB of 716.0 KiB)
Info::
Third-party blocking time is low (0 ms)
86%
First-party Third-party
C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://a.fsdn.com/con/img/hi-text.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://slashdot.org/images/js.gif?601 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 147 KB
0 oversized -0 KB
7 legacy format
3 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

B
JS Execution Cost
507ms total JS execution
REVIEW
507ms total JS execution
Info::
https://slashdot.org/: 237ms CPU time
Info::
Unattributable: 79ms CPU time
Info::
https://slashdot.org/cdn-cgi/challenge-platform/sc...: 68ms CPU time
Info::
https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c5...: 68ms CPU time
Info::
https://cdn.consentmanager.net/delivery/customdata...: 55ms CPU time
Info::
Third-party scripts: 202ms (40% of total)

Main Thread Breakdown

Script Evaluation 39% Other 24% Style & Layout 20% Rendering 7% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://slashdot.org/237ms26ms4ms1st
Unattributable79ms2ms0ms3rd
https://slashdot.org/cdn-cgi/challenge-platform/scripts/jsd/main.js68ms63ms1ms1st
https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c5325768ms32ms9ms3rd
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfMTIxMjYucl9HRFBSLmxfZW4uZF8yNDkyLnhfMTUudi5wLnRfMjQ5Mi54dF84Mg.js55ms49ms1ms3rd
B
JS Bundles
13 scripts, 128 KB unused
REVIEW
13 scripts, 128 KB unused
Warning::
https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c5...: 92 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.consentmanager.net/delivery/js/cmp_en....: 36 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 128 KB
128 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c53257128 KB92 KB (72%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_en.min.js100 KB36 KB (36%)✓3rd
https://d.delivery.consentmanager.net/delivery/cmp.php?&cdid=dba15d148b97&h=https%3A%2F%2Fslashdot.org%2F&cmpregulationkey=GDPR&&l=en&o=17762954725221 KB—✓3rd
https://a.fsdn.com/sd/js/scripts/asg_embed.js?a6bec9f7b7c532570 KB—✓3rd
https://a.fsdn.com/con/js/sandiego/maxnav.js?2026-04-091 KB—✓3rd
https://a.fsdn.com/con/js/sandiego/floating-unit.js?2026-04-0910 KB—✗3rd
https://a.fsdn.com/con/js/sftheme/cmp-slashdot.js?2026-04-0922 KB—✗3rd
https://a.fsdn.com/sd/js/scripts/ad_top.js?a6bec9f7b7c532570 KB—✓3rd
https://analytics.slashdotmedia.com/sd.js23 KB—✓3rd
https://slashdot.org/cdn-cgi/challenge-platform/h/g/scripts/jsd/b0a7532ac8ec/main.js?12 KB—✓1st

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

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
A
Page Weight Budget
716 KB transferred, 62 requests
PASS
716 KB transferred, 62 requests
Info::
Page weighs 1.9 MB (716 KB transferred)
Info::
62 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
716 KB / 2.4 MB budget
716 KB transferred
62 requests
0.15 g CO2 per page load
JavaScript 316.5 KiB 44%
Images 146.9 KiB 21%
Fonts 92.1 KiB 13%
CSS 65.2 KiB 9%
Other 45.7 KiB 6%
HTML 39.5 KiB 6%
Other 9.0 KiB 1%
Other 1.2 KiB 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
3 fonts (92 KB)
PASS
3 fonts (92 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

92 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 888 ms LCP 1.2 shttps://a.fsdn.com/sd/font/sdicon.woff?a6bec9f7b7c53257sdicon.woff https://a.fsdn.com/sd/font/sdicon.woff?a6bec9f7b7c53257 — 44.7 KiB — 85 ms — font-display: swaphttps://a.fsdn.com/con/css/fonts/sftheme/inter-v20-latin-regular.woff2inter-v20-latin-regular... https://a.fsdn.com/con/css/fonts/sftheme/inter-v20-latin-regular.woff2 — 23.4 KiB — 31 ms — font-display: swaphttps://a.fsdn.com/con/css/fonts/sftheme/inter-v20-latin-700.woff2inter-v20-latin-700.woff2 https://a.fsdn.com/con/css/fonts/sftheme/inter-v20-latin-700.woff2 — 24.0 KiB — 44 ms — font-display: swap
sdicon.woff woff swap
Size 45 KB
Load time 85 ms
Start 426 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
inter-v20-latin-regular... woff2 swap
Size 23 KB
Load time 31 ms
Start 916 ms
Risk FOUT — text flashes from fallback to web font
inter-v20-latin-700.woff2 woff2 swap
Size 24 KB
Load time 44 ms
Start 916 ms
Risk FOUT — text flashes from fallback to web font
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 ~13 KB and ~26 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
Page Weight Inventory
62 resources · 716 KB · 128 KB savings available
PASS
62 resources · 716 KB · 128 KB savings available
Info::
Within 1MB page-weight target
Got: 716 KB
Info::
~128 KB of savings available
Warning::
51 third-party resources (86% of weight)
62 resources · 716.0 KiB · 51 third-party Within 1MB page-weight target
JavaScript 44% · 316.5 KiB
Image 21% · 147.8 KiB
Font 13% · 92.1 KiB
CSS 9% · 65.2 KiB
Other 8% · 54.9 KiB
Document 6% · 39.5 KiB

~128.0 KiB of savings available

Remove unused JavaScript: 128.0 KiB
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
62 requests over 1404ms
INFO
0 ms 500 ms 1.0 s FCP 888 ms LCP 1.2 shttps://slashdot.org// https://slashdot.org/ — 200 — 39.5 KiB — 248 ms — h2https://a.fsdn.com/sd/classic.ssl.css?a6bec9f7b7c53257a.fsdn.com/sd/classic.ssl.css?a6bec... https://a.fsdn.com/sd/classic.ssl.css?a6bec9f7b7c53257 — 200 — 34.3 KiB — 111 ms — h2https://a.fsdn.com/sd/css/app.css?a6bec9f7b7c53257a.fsdn.com/sd/css/app.css?a6bec9f7b... https://a.fsdn.com/sd/css/app.css?a6bec9f7b7c53257 — 200 — 23.7 KiB — 126 ms — h2https://a.fsdn.com/con/js/sftheme/cmp-slashdot.js?2026-04-09a.fsdn.com/con/js/sftheme/cmp-slash... https://a.fsdn.com/con/js/sftheme/cmp-slashdot.js?2026-04-09 — 200 — 21.8 KiB — 91 ms — h2https://a.fsdn.com/con/css/sftheme/sandiego/cmp.css?2026-04-09a.fsdn.com/con/css/sftheme/sandiego... https://a.fsdn.com/con/css/sftheme/sandiego/cmp.css?2026-04-09 — 200 — 1.3 KiB — 86 ms — h2https://a.fsdn.com/sd/js/scripts/ad_top.js?a6bec9f7b7c53257a.fsdn.com/sd/js/scripts/ad_top.js?... https://a.fsdn.com/sd/js/scripts/ad_top.js?a6bec9f7b7c53257 — 200 — 110 B — 124 ms — h2https://a.fsdn.com/sd/js/scripts/asg_embed.js?a6bec9f7b7c53257a.fsdn.com/sd/js/scripts/asg_embed.... https://a.fsdn.com/sd/js/scripts/asg_embed.js?a6bec9f7b7c53257 — 200 — 281 B — 82 ms — h2https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c53257a.fsdn.com/sd/all-minified.js?a6bec... https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c53257 — 200 — 127.9 KiB — 125 ms — h2https://a.fsdn.com/sd/NewsletterSubscription.png?v=2a.fsdn.com/sd/NewsletterSubscriptio... https://a.fsdn.com/sd/NewsletterSubscription.png?v=2 — 200 — 69.0 KiB — 41 ms — h2https://a.fsdn.com/sd/ccpa-optout.pnga.fsdn.com/sd/ccpa-optout.png https://a.fsdn.com/sd/ccpa-optout.png — 200 — 941 B — 41 ms — h2https://a.fsdn.com/con/js/sandiego/maxnav.js?2026-04-09a.fsdn.com/con/js/sandiego/maxnav.j... https://a.fsdn.com/con/js/sandiego/maxnav.js?2026-04-09 — 200 — 678 B — 37 ms — h3https://a.fsdn.com/con/js/sandiego/floating-unit.js?2026-04-09a.fsdn.com/con/js/sandiego/floating... https://a.fsdn.com/con/js/sandiego/floating-unit.js?2026-04-09 — 200 — 9.6 KiB — 38 ms — h3https://a.fsdn.com/sd/topics/robot_64.pnga.fsdn.com/sd/topics/robot_64.png https://a.fsdn.com/sd/topics/robot_64.png — 200 — 3.4 KiB — 73 ms — h3https://a.fsdn.com/sd/topics/transportation_64.pnga.fsdn.com/sd/topics/transportation... https://a.fsdn.com/sd/topics/transportation_64.png — 200 — 3.6 KiB — 73 ms — h3https://a.fsdn.com/sd/topics/ai_64.pnga.fsdn.com/sd/topics/ai_64.png https://a.fsdn.com/sd/topics/ai_64.png — 200 — 5.1 KiB — 72 ms — h3https://a.fsdn.com/sd/topics/court_64.pnga.fsdn.com/sd/topics/court_64.png https://a.fsdn.com/sd/topics/court_64.png — 200 — 4.6 KiB — 71 ms — h3https://a.fsdn.com/sd/topics/piracy_64.pnga.fsdn.com/sd/topics/piracy_64.png https://a.fsdn.com/sd/topics/piracy_64.png — 200 — 5.5 KiB — 79 ms — h3https://a.fsdn.com/sd/topics/business_64.pnga.fsdn.com/sd/topics/business_64.pn... https://a.fsdn.com/sd/topics/business_64.png — 200 — 4.1 KiB — 71 ms — h3https://a.fsdn.com/sd/topics/power_64.pnga.fsdn.com/sd/topics/power_64.png https://a.fsdn.com/sd/topics/power_64.png — 200 — 3.9 KiB — 71 ms — h3https://a.fsdn.com/sd/topics/medicine_64.png?refresh=nowa.fsdn.com/sd/topics/medicine_64.pn... https://a.fsdn.com/sd/topics/medicine_64.png?refresh=now — 200 — 2.1 KiB — 75 ms — h3https://a.fsdn.com/sd/topics/movies_64.pnga.fsdn.com/sd/topics/movies_64.png https://a.fsdn.com/sd/topics/movies_64.png — 200 — 2.2 KiB — 71 ms — h3https://a.fsdn.com/sd/topics/sony_64.pnga.fsdn.com/sd/topics/sony_64.png https://a.fsdn.com/sd/topics/sony_64.png — 200 — 809 B — 75 ms — h3https://a.fsdn.com/sd/topics/wireless_64.pnga.fsdn.com/sd/topics/wireless_64.pn... https://a.fsdn.com/sd/topics/wireless_64.png — 200 — 3.2 KiB — 76 ms — h3https://a.fsdn.com/sd/topics/money_64.pnga.fsdn.com/sd/topics/money_64.png https://a.fsdn.com/sd/topics/money_64.png — 200 — 4.0 KiB — 77 ms — h3https://a.fsdn.com/sd/topics/printer_64.pnga.fsdn.com/sd/topics/printer_64.png https://a.fsdn.com/sd/topics/printer_64.png — 200 — 2.3 KiB — 76 ms — h3https://d.delivery.consentmanager.net/delivery/cmp.php?&cdid=dba15d148b97&h=https%3A%2F%2Fslashdot.org%2F&cmpregulationkey=GDPR&&l=en&o=1776295472522d.delivery.consentmanager.net/deliv... https://d.delivery.consentmanager.net/delivery/cmp.php?&cdid=dba15d148b97&h=https%3A%2F%2Fslashdot.org%2F&cmpregulationkey=GDPR&&l=en&o=1776295472522 — 200 — 934 B — 108 ms — h2https://cdn.consentmanager.net/delivery/js/cmp_en.min.jscdn.consentmanager.net/delivery/js/... https://cdn.consentmanager.net/delivery/js/cmp_en.min.js — 200 — 100.5 KiB — 100 ms — h2https://a.fsdn.com/sd/slashdot_tm.svga.fsdn.com/sd/slashdot_tm.svg https://a.fsdn.com/sd/slashdot_tm.svg — 200 — 1.5 KiB — 35 ms — h3https://a.fsdn.com/sd/slashdot_favicon_white.pnga.fsdn.com/sd/slashdot_favicon_whit... https://a.fsdn.com/sd/slashdot_favicon_white.png — 200 — 521 B — 46 ms — h3https://a.fsdn.com/sd/font/sdicon.woff?a6bec9f7b7c53257a.fsdn.com/sd/font/sdicon.woff?a6be... https://a.fsdn.com/sd/font/sdicon.woff?a6bec9f7b7c53257 — 200 — 44.7 KiB — 85 ms — h3
0 ms 500 ms 1.0 s FCP 888 ms LCP 1.2 shttps://slashdot.org// https://slashdot.org/ — 200 — 39.5 KiB — 248 ms — h2https://a.fsdn.com/sd/classic.ssl.css?a6bec9f7b7c53257a.fsdn.com/sd/classic.ssl.css?a6bec... https://a.fsdn.com/sd/classic.ssl.css?a6bec9f7b7c53257 — 200 — 34.3 KiB — 111 ms — h2https://a.fsdn.com/sd/css/app.css?a6bec9f7b7c53257a.fsdn.com/sd/css/app.css?a6bec9f7b... https://a.fsdn.com/sd/css/app.css?a6bec9f7b7c53257 — 200 — 23.7 KiB — 126 ms — h2https://a.fsdn.com/con/js/sftheme/cmp-slashdot.js?2026-04-09a.fsdn.com/con/js/sftheme/cmp-slash... https://a.fsdn.com/con/js/sftheme/cmp-slashdot.js?2026-04-09 — 200 — 21.8 KiB — 91 ms — h2https://a.fsdn.com/con/css/sftheme/sandiego/cmp.css?2026-04-09a.fsdn.com/con/css/sftheme/sandiego... https://a.fsdn.com/con/css/sftheme/sandiego/cmp.css?2026-04-09 — 200 — 1.3 KiB — 86 ms — h2https://a.fsdn.com/sd/js/scripts/ad_top.js?a6bec9f7b7c53257a.fsdn.com/sd/js/scripts/ad_top.js?... https://a.fsdn.com/sd/js/scripts/ad_top.js?a6bec9f7b7c53257 — 200 — 110 B — 124 ms — h2https://a.fsdn.com/sd/js/scripts/asg_embed.js?a6bec9f7b7c53257a.fsdn.com/sd/js/scripts/asg_embed.... https://a.fsdn.com/sd/js/scripts/asg_embed.js?a6bec9f7b7c53257 — 200 — 281 B — 82 ms — h2https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c53257a.fsdn.com/sd/all-minified.js?a6bec... https://a.fsdn.com/sd/all-minified.js?a6bec9f7b7c53257 — 200 — 127.9 KiB — 125 ms — h2https://a.fsdn.com/sd/NewsletterSubscription.png?v=2a.fsdn.com/sd/NewsletterSubscriptio... https://a.fsdn.com/sd/NewsletterSubscription.png?v=2 — 200 — 69.0 KiB — 41 ms — h2https://a.fsdn.com/sd/ccpa-optout.pnga.fsdn.com/sd/ccpa-optout.png https://a.fsdn.com/sd/ccpa-optout.png — 200 — 941 B — 41 ms — h2https://a.fsdn.com/con/js/sandiego/maxnav.js?2026-04-09a.fsdn.com/con/js/sandiego/maxnav.j... https://a.fsdn.com/con/js/sandiego/maxnav.js?2026-04-09 — 200 — 678 B — 37 ms — h3https://a.fsdn.com/con/js/sandiego/floating-unit.js?2026-04-09a.fsdn.com/con/js/sandiego/floating... https://a.fsdn.com/con/js/sandiego/floating-unit.js?2026-04-09 — 200 — 9.6 KiB — 38 ms — h3https://a.fsdn.com/sd/topics/robot_64.pnga.fsdn.com/sd/topics/robot_64.png https://a.fsdn.com/sd/topics/robot_64.png — 200 — 3.4 KiB — 73 ms — h3https://a.fsdn.com/sd/topics/transportation_64.pnga.fsdn.com/sd/topics/transportation... https://a.fsdn.com/sd/topics/transportation_64.png — 200 — 3.6 KiB — 73 ms — h3https://a.fsdn.com/sd/topics/ai_64.pnga.fsdn.com/sd/topics/ai_64.png https://a.fsdn.com/sd/topics/ai_64.png — 200 — 5.1 KiB — 72 ms — h3https://a.fsdn.com/sd/topics/court_64.pnga.fsdn.com/sd/topics/court_64.png https://a.fsdn.com/sd/topics/court_64.png — 200 — 4.6 KiB — 71 ms — h3https://a.fsdn.com/sd/topics/piracy_64.pnga.fsdn.com/sd/topics/piracy_64.png https://a.fsdn.com/sd/topics/piracy_64.png — 200 — 5.5 KiB — 79 ms — h3https://a.fsdn.com/sd/topics/business_64.pnga.fsdn.com/sd/topics/business_64.pn... https://a.fsdn.com/sd/topics/business_64.png — 200 — 4.1 KiB — 71 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
40% of JavaScript execution is third-party
First-party Third-party 202ms · 144KB · €2/mo
Unattributable
Other
Optional
Execution 79ms
Transfer 0 KB
Monthly Cost €1/mo
a.fsdn.com
Other
Optional
Execution 68ms
Transfer 128 KB
Unused 72%
Monthly Cost €1/mo
cdn.consentmanager.net
Other
Optional
Execution 55ms
Transfer 16 KB
Monthly Cost €1/mo

72% of a.fsdn.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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