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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
2
REVIEW
0
PASS
13
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.68 s

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

3.69 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.

2.68 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.

3.69 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
13 PASS 2 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 (249.3 KiB of 249.4 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

A+
Page Weight Budget
249 KB transferred, 18 requests
PASS
249 KB transferred, 18 requests
Info::
Page weighs 568 KB (249 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
249 KB / 2.4 MB budget
249 KB transferred
18 requests
0.05 g CO2 per page load
Images 96.6 KiB 39%
JavaScript 66.3 KiB 27%
CSS 58.1 KiB 23%
HTML 15.1 KiB 6%
Fonts 12.8 KiB 5%
Other 523 B 0%
Other 0 B 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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 97 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
394ms total JS execution
PASS
394ms total JS execution
Info::
https://www.rfc-editor.org/: 197ms CPU time
Info::
Unattributable: 141ms CPU time
Info::
https://www.rfc-editor.org/wp-includes/js/jquery/j...: 56ms CPU time
Warning::
Third-party scripts: 394ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 34% Style & Layout 14% Parse HTML & CSS 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.rfc-editor.org/197ms82ms5ms3rd
Unattributable141ms12ms0ms3rd
https://www.rfc-editor.org/wp-includes/js/jquery/jquery.min.js?ver=3.6.056ms40ms8ms3rd
A+
Font Loading
1 fonts (13 KB)
PASS
1 fonts (13 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

13 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 1.0 s 2.0 s 3.0 s FCP 2.7 s LCP 3.7 shttps://fonts.gstatic.com/s/notosans/v42/o-0mIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjcz6L1SoM-jCpoiyD9A-9a6VLYz2tZ.woff2o-0mIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0mIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjcz6L1SoM-jCpoiyD9A-9a6VLYz2tZ.woff2 — 12.8 KiB — 24 ms — font-display: swap
o-0mIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 13 KB
Load time 24 ms
Start 843 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)
A+
JS Bundles
6 scripts, 21 KB unused
PASS
6 scripts, 21 KB unused
Warning::
https://www.rfc-editor.org/wp-includes/js/jquery/j...: 21 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 21 KB
21 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.rfc-editor.org/wp-includes/js/jquery/jquery.min.js?ver=3.6.030 KB21 KB (68%)✓3rd
https://www.rfc-editor.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.3.24 KB—✓3rd
https://www.rfc-editor.org/wp-includes/js/wp-emoji-release.min.js?ver=6.0.115 KB—✓3rd
https://www.rfc-editor.org/wp-content/plugins/responsive-menu/v4.0.0/assets/js/rmp-menu.js?ver=4.1.113 KB—✓3rd
https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/js/matomo-tracking.js1 KB—✓3rd
https://analytics.ietf.org/matomo.js23 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

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
—
dns-prefetch
2
prefetch
—

2 resource hints configured

A
Page Weight Inventory
18 resources · 249 KB · 21 KB savings available
PASS
18 resources · 249 KB · 21 KB savings available
Info::
Within 1MB page-weight target
Got: 249 KB
Warning::
17 third-party resources (100% of weight)
18 resources · 249.4 KiB · 17 third-party Within 1MB page-weight target
Image 39% · 97.0 KiB
JavaScript 27% · 66.3 KiB
CSS 23% · 58.1 KiB
Document 6% · 15.1 KiB
Font 5% · 12.8 KiB
Other 0% · 121 B

~20.7 KiB of savings available

Remove unused JavaScript: 20.7 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
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
18 requests over 1485ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.7 s LCP 3.7 shttps://rfc-editor.org// https://rfc-editor.org/ — 301 — 121 B — 62 ms — h2https://www.rfc-editor.org/www.rfc-editor.org/ https://www.rfc-editor.org/ — 200 — 15.1 KiB — 625 ms — h2https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/style.csswww.rfc-editor.org/wp-content/theme... https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/style.css — 200 — 8.8 KiB — 53 ms — h2https://www.rfc-editor.org/wp-includes/css/dist/block-library/style.min.css?ver=6.0.11www.rfc-editor.org/wp-includes/css/... https://www.rfc-editor.org/wp-includes/css/dist/block-library/style.min.css?ver=6.0.11 — 200 — 11.5 KiB — 48 ms — h2https://www.rfc-editor.org/wp-includes/css/dashicons.min.css?ver=6.0.11www.rfc-editor.org/wp-includes/css/... https://www.rfc-editor.org/wp-includes/css/dashicons.min.css?ver=6.0.11 — 200 — 35.0 KiB — 37 ms — h2https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/css/mobile.css?ver=0.1www.rfc-editor.org/wp-content/theme... https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/css/mobile.css?ver=0.1 — 200 — 1.6 KiB — 36 ms — h2https://fonts.googleapis.com/css?family=Noto+Sans%7C&ver=6.0.11fonts.googleapis.com/css?family=Not... https://fonts.googleapis.com/css?family=Noto+Sans%7C&ver=6.0.11 — 200 — 1.2 KiB — 102 ms — h2https://www.rfc-editor.org/wp-includes/js/jquery/jquery.min.js?ver=3.6.0www.rfc-editor.org/wp-includes/js/j... https://www.rfc-editor.org/wp-includes/js/jquery/jquery.min.js?ver=3.6.0 — 200 — 30.4 KiB — 32 ms — h2https://www.rfc-editor.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.3.2www.rfc-editor.org/wp-includes/js/j... https://www.rfc-editor.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.3.2 — 200 — 4.3 KiB — 47 ms — h2https://www.rfc-editor.org/wp-includes/js/wp-emoji-release.min.js?ver=6.0.11www.rfc-editor.org/wp-includes/js/w... https://www.rfc-editor.org/wp-includes/js/wp-emoji-release.min.js?ver=6.0.11 — 200 — 5.2 KiB — 32 ms — h3https://www.rfc-editor.org/wp-content/plugins/responsive-menu/v4.0.0/assets/js/rmp-menu.js?ver=4.1.11www.rfc-editor.org/wp-content/plugi... https://www.rfc-editor.org/wp-content/plugins/responsive-menu/v4.0.0/assets/js/rmp-menu.js?ver=4.1.11 — 200 — 3.1 KiB — 33 ms — h3https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/js/matomo-tracking.jswww.rfc-editor.org/wp-content/theme... https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/js/matomo-tracking.js — 200 — 618 B — 122 ms — h3https://www.rfc-editor.org/wp-content/uploads/ISOC-Dark-RGB_Logo_2016-08-01_EN_FINAL_v01.pngwww.rfc-editor.org/wp-content/uploa... https://www.rfc-editor.org/wp-content/uploads/ISOC-Dark-RGB_Logo_2016-08-01_EN_FINAL_v01.png — 200 — 95.7 KiB — 173 ms — h3https://analytics.ietf.org/matomo.jsanalytics.ietf.org/matomo.js https://analytics.ietf.org/matomo.js — 200 — 22.7 KiB — 119 ms — h3https://www.rfc-editor.org/wp-includes/images/rss.pngwww.rfc-editor.org/wp-includes/imag... https://www.rfc-editor.org/wp-includes/images/rss.png — 200 — 879 B — 118 ms — h3https://fonts.gstatic.com/s/notosans/v42/o-0mIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjcz6L1SoM-jCpoiyD9A-9a6VLYz2tZ.woff2fonts.gstatic.com/s/notosans/v42/o-... https://fonts.gstatic.com/s/notosans/v42/o-0mIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjcz6L1SoM-jCpoiyD9A-9a6VLYz2tZ.woff2 — 200 — 12.8 KiB — 24 ms — h3https://analytics.ietf.org/matomo.php?action_name=%C2%BB%20RFC%20Editor&idsite=10&rec=1&r=646198&h=19&m=1&s=37&url=https%3A%2F%2Fwww.rfc-editor.org%2F&_id=98f12cc23f28931d&_idn=1&send_image=0&_refts=0&pv_id=hzmxpJ&pf_net=44&pf_srv=504&pf_tfr=78&pf_dm1=224&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823analytics.ietf.org/matomo.php?actio... https://analytics.ietf.org/matomo.php?action_name=%C2%BB%20RFC%20Editor&idsite=10&rec=1&r=646198&h=19&m=1&s=37&url=https%3A%2F%2Fwww.rfc-editor.org%2F&_id=98f12cc23f28931d&_idn=1&send_image=0&_refts=0&pv_id=hzmxpJ&pf_net=44&pf_srv=504&pf_tfr=78&pf_dm1=224&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823 — 204 — 0 B — 528 ms — h3https://www.rfc-editor.org/wp-content/uploads/favicon-1.icowww.rfc-editor.org/wp-content/uploa... https://www.rfc-editor.org/wp-content/uploads/favicon-1.ico — 200 — 402 B — 28 ms — h3
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 394ms · 45KB · €4/mo
www.rfc-editor.org
Other
Optional
Execution 197ms
Transfer 15 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 141ms
Transfer 0 KB
Monthly Cost €2/mo
www.rfc-editor.org
Other
Optional
Execution 56ms
Transfer 30 KB
Unused 68%
Monthly Cost €1/mo

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

68% of www.rfc-editor.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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