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https://www.signal.org

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
69
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
82
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.

2.83 s

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

7.61 s

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

143 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.

2.83 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.

7.87 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
16
10 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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://signal.org/assets/images/header/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/Media.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/Calls.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/Groups.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/No-Ads.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/Nonprofi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/signal-i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://signal.org/assets/images/features/Stickers... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 467 KB
0 oversized -0 KB
10 legacy format
8 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

C
JS Execution Cost
Action
1934ms total JS execution
REVIEW
1934ms total JS execution
Warning::
https://signal.org/assets/javascripts/vendor/lotti...: 1105ms CPU time
Warning::
https://signal.org/: 501ms CPU time
Warning::
Unattributable: 265ms CPU time
Info::
https://signal.org/assets/javascripts/vendor/jquer...: 64ms CPU time
Warning::
Third-party scripts: 1934ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 28% Style & Layout 17% Rendering 7% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://signal.org/assets/javascripts/vendor/lottie-player-2.0.3.min.js1105ms749ms54ms3rd
https://signal.org/501ms12ms3ms3rd
Unattributable265ms7ms0ms3rd
https://signal.org/assets/javascripts/vendor/jquery-3.7.1.min.js64ms46ms12ms3rd
B
JS Bundles
3 scripts, 76 KB unused
REVIEW
3 scripts, 76 KB unused
Warning::
https://signal.org/assets/javascripts/vendor/lotti...: 54 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://signal.org/assets/javascripts/vendor/jquer...: 22 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 76 KB
76 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://signal.org/assets/javascripts/vendor/lottie-player-2.0.3.min.js95 KB54 KB (57%)✓3rd
https://signal.org/assets/javascripts/vendor/jquery-3.7.1.min.js30 KB22 KB (73%)✓3rd
https://signal.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 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

A
Page Weight Budget
1.0 MB transferred, 25 requests
PASS
1.0 MB transferred, 25 requests
Info::
Page weighs 2.2 MB (1.0 MB transferred)
Info::
Fonts are 309 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 309 KB
Info::
25 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
25 requests
0.21 g CO2 per page load
Images 466.6 KiB 45%
Fonts 309.2 KiB 30%
JavaScript 125.9 KiB 12%
CSS 67.1 KiB 7%
Other 52.0 KiB 5%
HTML 6.2 KiB 1%
Other 1.7 KiB 0%
Other 785 B 0%
Other 463 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (309 KB)
PASS
3 fonts (309 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

309 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.8 s LCP 7.6 shttps://signal.org/assets/fonts/inter/Inter-Regular.woff2Inter-Regular.woff2 https://signal.org/assets/fonts/inter/Inter-Regular.woff2 — 98.4 KiB — 0 ms — font-display: swaphttps://signal.org/assets/fonts/inter/Inter-ExtraBold.woff2Inter-ExtraBold.woff2 https://signal.org/assets/fonts/inter/Inter-ExtraBold.woff2 — 105.6 KiB — 0 ms — font-display: swaphttps://signal.org/assets/fonts/inter/Inter-SemiBold.woff2Inter-SemiBold.woff2 https://signal.org/assets/fonts/inter/Inter-SemiBold.woff2 — 105.3 KiB — 0 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 98 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-ExtraBold.woff2 woff2 swap
Size 106 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-SemiBold.woff2 woff2 swap
Size 105 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~105 KB and ~210 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
2
dns-prefetch
—
prefetch
—

2 resource hints configured

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: Cloudflare

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
25 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 1934ms · 131KB · $26/mo
signal.org
Other
Costly
Execution 1105ms
Transfer 95 KB
Unused 57%
Monthly Cost $15/mo
signal.org
Other
Costly
Execution 501ms
Transfer 6 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 265ms
Transfer 0 KB
Monthly Cost $4/mo
signal.org
Other
Optional
Execution 64ms
Transfer 30 KB
Unused 73%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • signal.org adds 1105ms and costs ~$15/month
  • signal.org adds 501ms and costs ~$7/month
  • Unattributable adds 265ms and costs ~$4/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

signal.org takes 1105ms 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

57% of signal.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

signal.org takes 501ms 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 265ms 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

73% of signal.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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