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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.
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.

2.71 s

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

2.71 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.

2.71 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.

2.71 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 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 (327.7 KiB of 327.9 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Image Optimization
3 images, 0 KB saveable
REVIEW
3 images, 0 KB saveable
Warning::
https://letsencrypt.org/images/letsencrypt-logo-ho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://letsencrypt.org/images/ISRG-Logo-Blue.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
3 images 13 KB
0 oversized -0 KB
3 legacy format
2 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Page Weight Budget
328 KB transferred, 20 requests
PASS
328 KB transferred, 20 requests
Info::
Page weighs 786 KB (328 KB transferred)
Info::
20 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
328 KB / 2.4 MB budget
328 KB transferred
20 requests
0.07 g CO2 per page load
Fonts 153.0 KiB 47%
JavaScript 107.1 KiB 33%
CSS 39.6 KiB 12%
Images 13.4 KiB 4%
HTML 12.1 KiB 4%
Other 2.6 KiB 1%
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+
JS Execution Cost
464ms total JS execution
PASS
464ms total JS execution
Warning::
https://letsencrypt.org/docs/lencr.org/: 302ms CPU time
Info::
Unattributable: 162ms CPU time
Warning::
Third-party scripts: 464ms (100% of total)

Main Thread Breakdown

Style & Layout 40% Other 39% Parse HTML & CSS 10% Script Evaluation 5% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://letsencrypt.org/docs/lencr.org/302ms6ms2ms3rd
Unattributable162ms6ms0ms3rd
A+
Font Loading
1 fonts (153 KB)
PASS
1 fonts (153 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

153 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.7 s LCP 2.7 shttps://letsencrypt.org/fontawesome-free-6.5.2-web/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://letsencrypt.org/fontawesome-free-6.5.2-web/webfonts/fa-solid-900.woff2 — 153.0 KiB — 16 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 16 ms
Start 345 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 ~76 KB and ~152 ms

A+
JS Bundles
7 scripts, 0 KB unused
PASS
7 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://letsencrypt.org/js/le-2025-theme.baca0a37d412391799a4e5f6d58968c12b948b4c91c053a3c025ab758ffb70bc.js2 KB—✓3rd
https://letsencrypt.org/js/autoanchor.44783525c73cfeef565e5b8441cd42a848cb630d9f365def73edce4867e6f4c8.js0 KB—✓3rd
https://letsencrypt.org/js/number-animation.137c25102252dc89411a5c2d9eb00a383f12425cb7845c8d8ac4c615c0af1f8e.js0 KB—✓3rd
https://letsencrypt.org/js/main.a572b61495f9d8fe4e5ec075082ddfe85e5a5ff501c15c499d3f2a4bed71afb6fe89e85f3202aa8fdeebcda97645416bfc75683c2d3471485b5668a6d5f98740.js2 KB—✓3rd
https://outreach.abetterinternet.org/js/piUtils.js?ver=2021-09-20100 KB—✓3rd
https://pi.pardot.com/pd.js2 KB—✓3rd
https://pi.pardot.com/analytics?ver=3&pi_form=true&visitor_id=&visitor_id_sign=&pi_opt_in=&campaign_id=64423&account_id=1012011&title=&url=https%3A%2F%2Foutreach.abetterinternet.org%2Fl%2F1011011%2F2025-01-14%2F31v6r&referrer=1 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
20 resources · 328 KB · 0 KB savings available
PASS
20 resources · 328 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 328 KB
Warning::
19 third-party resources (100% of weight)
20 resources · 327.9 KiB · 19 third-party Within 1MB page-weight target
Font 47% · 153.0 KiB
JavaScript 33% · 107.1 KiB
CSS 12% · 39.6 KiB
Image 5% · 15.7 KiB
Document 4% · 12.3 KiB
Other 0% · 213 B
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
20 requests over 1610ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.7 s LCP 2.7 shttps://lencr.org// https://lencr.org/ — 302 — 213 B — 19 ms — h2https://letsencrypt.org/docs/lencr.orgletsencrypt.org/docs/lencr.org https://letsencrypt.org/docs/lencr.org — 301 — 155 B — 95 ms — h2https://letsencrypt.org/docs/lencr.org/letsencrypt.org/docs/lencr.org/ https://letsencrypt.org/docs/lencr.org/ — 200 — 6.7 KiB — 148 ms — h2https://letsencrypt.org/css/le-2025-theme-input.32491b9db8ee7d6a9d8e7521b8535a1d1eacab9458d976e4c0d8dcc3ae0552a8.cssletsencrypt.org/css/le-2025-theme-i... https://letsencrypt.org/css/le-2025-theme-input.32491b9db8ee7d6a9d8e7521b8535a1d1eacab9458d976e4c0d8dcc3ae0552a8.css — 200 — 9.0 KiB — 15 ms — h2https://letsencrypt.org/fontawesome-free-6.5.2-web/css/all.min.cssletsencrypt.org/fontawesome-free-6.... https://letsencrypt.org/fontawesome-free-6.5.2-web/css/all.min.css — 200 — 21.6 KiB — 17 ms — h2https://letsencrypt.org/js/le-2025-theme.baca0a37d412391799a4e5f6d58968c12b948b4c91c053a3c025ab758ffb70bc.jsletsencrypt.org/js/le-2025-theme.ba... https://letsencrypt.org/js/le-2025-theme.baca0a37d412391799a4e5f6d58968c12b948b4c91c053a3c025ab758ffb70bc.js — 200 — 1.7 KiB — 31 ms — h2https://letsencrypt.org/js/autoanchor.44783525c73cfeef565e5b8441cd42a848cb630d9f365def73edce4867e6f4c8.jsletsencrypt.org/js/autoanchor.44783... https://letsencrypt.org/js/autoanchor.44783525c73cfeef565e5b8441cd42a848cb630d9f365def73edce4867e6f4c8.js — 200 — 408 B — 23 ms — h2https://letsencrypt.org/js/number-animation.137c25102252dc89411a5c2d9eb00a383f12425cb7845c8d8ac4c615c0af1f8e.jsletsencrypt.org/js/number-animation... https://letsencrypt.org/js/number-animation.137c25102252dc89411a5c2d9eb00a383f12425cb7845c8d8ac4c615c0af1f8e.js — 200 — 499 B — 33 ms — h2https://letsencrypt.org/images/language-icon128px-black.pngletsencrypt.org/images/language-ico... https://letsencrypt.org/images/language-icon128px-black.png — 200 — 4.8 KiB — 23 ms — h2https://letsencrypt.org/images/letsencrypt-logo-horizontal.svgletsencrypt.org/images/letsencrypt-... https://letsencrypt.org/images/letsencrypt-logo-horizontal.svg — 200 — 4.9 KiB — 24 ms — h2https://letsencrypt.org/images/ISRG-Logo-Blue.svgletsencrypt.org/images/ISRG-Logo-Bl... https://letsencrypt.org/images/ISRG-Logo-Blue.svg — 200 — 3.8 KiB — 9 ms — h2https://letsencrypt.org/js/main.a572b61495f9d8fe4e5ec075082ddfe85e5a5ff501c15c499d3f2a4bed71afb6fe89e85f3202aa8fdeebcda97645416bfc75683c2d3471485b5668a6d5f98740.jsletsencrypt.org/js/main.a572b61495f... https://letsencrypt.org/js/main.a572b61495f9d8fe4e5ec075082ddfe85e5a5ff501c15c499d3f2a4bed71afb6fe89e85f3202aa8fdeebcda97645416bfc75683c2d3471485b5668a6d5f98740.js — 200 — 1.8 KiB — 11 ms — h2https://outreach.abetterinternet.org/l/1011011/2025-01-14/31v6routreach.abetterinternet.org/l/1011... https://outreach.abetterinternet.org/l/1011011/2025-01-14/31v6r — 200 — 5.5 KiB — 501 ms — http/1.1https://letsencrypt.org/fontawesome-free-6.5.2-web/webfonts/fa-solid-900.woff2letsencrypt.org/fontawesome-free-6.... https://letsencrypt.org/fontawesome-free-6.5.2-web/webfonts/fa-solid-900.woff2 — 200 — 153.0 KiB — 16 ms — h2https://fonts.googleapis.com/css?family=Nunito:300,400,600,700,800fonts.googleapis.com/css?family=Nun... https://fonts.googleapis.com/css?family=Nunito:300,400,600,700,800 — 200 — 1.1 KiB — 88 ms — h2https://outreach.abetterinternet.org/css/form.css?ver=2021-09-20outreach.abetterinternet.org/css/fo... https://outreach.abetterinternet.org/css/form.css?ver=2021-09-20 — 200 — 7.9 KiB — 73 ms — http/1.1https://outreach.abetterinternet.org/js/piUtils.js?ver=2021-09-20outreach.abetterinternet.org/js/piU... https://outreach.abetterinternet.org/js/piUtils.js?ver=2021-09-20 — 200 — 99.8 KiB — 288 ms — http/1.1https://pi.pardot.com/pd.jspi.pardot.com/pd.js https://pi.pardot.com/pd.js — 200 — 2.3 KiB — 224 ms — http/1.1https://letsencrypt.org/favicon.icoletsencrypt.org/favicon.ico https://letsencrypt.org/favicon.ico — 200 — 2.3 KiB — 7 ms — h2https://pi.pardot.com/analytics?ver=3&pi_form=true&visitor_id=&visitor_id_sign=&pi_opt_in=&campaign_id=64423&account_id=1012011&title=&url=https%3A%2F%2Foutreach.abetterinternet.org%2Fl%2F1011011%2F2025-01-14%2F31v6r&referrer=pi.pardot.com/analytics?ver=3&pi_fo... https://pi.pardot.com/analytics?ver=3&pi_form=true&visitor_id=&visitor_id_sign=&pi_opt_in=&campaign_id=64423&account_id=1012011&title=&url=https%3A%2F%2Foutreach.abetterinternet.org%2Fl%2F1011011%2F2025-01-14%2F31v6r&referrer= — 200 — 683 B — 198 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 464ms · 7KB · $6/mo
letsencrypt.org
Other
Costly
Execution 302ms
Transfer 7 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 162ms
Transfer 0 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • letsencrypt.org adds 302ms 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

letsencrypt.org takes 302ms 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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