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https://matrix.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
1
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
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.

313 ms

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

2.51 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.

313 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.51 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
15
10 PASS 2 REVIEW 1 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 20 requests
FIX
2.6 MB transferred, 20 requests
Warning::
Page weighs 3.0 MB (2.6 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Info::
20 HTTP requests
Info::
Estimated 0.55 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
20 requests
0.55 g CO2 per page load
Images 2.6 MiB 99%
CSS 14.1 KiB 1%
HTML 5.8 KiB 0%
JavaScript 4.1 KiB 0%
Other 2.5 KiB 0%
Other 504 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://matrix.org/assets/frontpage/personal-graph... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://matrix.org/assets/frontpage/community-grap... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://matrix.org/element-call.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://matrix.org/assets/frontpage/github-mark.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 2.6 MB
0 oversized -0 KB
12 legacy format
4 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

C
Page Weight Inventory
Action
20 resources · 2.6 MB · 0 KB savings available
REVIEW
20 resources · 2.6 MB · 0 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
2 third-party resources (0% of weight)
Info::
1 resources over 200KB
20 resources · 2.6 MiB · 2 third-party 1.6 MiB over 1MB target
Image 99% · 2.6 MiB
CSS 1% · 14.1 KiB
Document 0% · 5.8 KiB
JavaScript 0% · 4.1 KiB
Other 0% · 504 B
A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (3.0 KiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-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+
JS Execution Cost
86ms total JS execution
PASS
86ms total JS execution
Info::
Unattributable: 86ms CPU time
Warning::
Third-party scripts: 86ms (100% of total)

Main Thread Breakdown

Other 72% Style & Layout 14% Script Evaluation 6% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable86ms1ms0ms3rd
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
2 scripts, 0 KB unused
PASS
2 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://matrix.org/js/components.js?h=ccd1d6f19374cb9a0b4a2 KB—✓1st
https://plausible.io/js/script.tagged-events.js2 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+
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=14400 (4 hours)
PASS
max-age=14400 (4 hours)
Info::
Cache-Control header is set
Got: public, max-age=14400, must-revalidate
Info::
Effective TTL: 4 hours (max-age=14400)
Info::
Last-Modified header present
Cache-Control

public, max-age=14400, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age14400Cache for 4 hours
must-revalidate—Must recheck with server after expiry
Effective TTL: 14400 seconds
Network Waterfall
20 requests over 319ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 313 ms LCP 2.5 shttps://matrix.org// https://matrix.org/ — 200 — 5.8 KiB — 61 ms — h2https://matrix.org/style.css?h=5c660011de728e4ffb02/style.css?h=5c660011de728e4ffb02 https://matrix.org/style.css?h=5c660011de728e4ffb02 — 200 — 14.1 KiB — 57 ms — h2https://matrix.org/js/components.js?h=ccd1d6f19374cb9a0b4a/js/components.js?h=ccd1d6f19374cb9... https://matrix.org/js/components.js?h=ccd1d6f19374cb9a0b4a — 200 — 1.6 KiB — 60 ms — h2https://matrix.org/images/matrix-logo-white.svg/images/matrix-logo-white.svg https://matrix.org/images/matrix-logo-white.svg — 200 — 3.9 KiB — 40 ms — h2https://matrix.org/assets/frontpage/personal-graphic.svg/assets/frontpage/personal-graphic.... https://matrix.org/assets/frontpage/personal-graphic.svg — 200 — 52.5 KiB — 46 ms — h2https://matrix.org/assets/frontpage/community-graphic.svg/assets/frontpage/community-graphic... https://matrix.org/assets/frontpage/community-graphic.svg — 200 — 15.3 KiB — 60 ms — h2https://matrix.org/element-call.webp/element-call.webp https://matrix.org/element-call.webp — 200 — 2.4 MiB — 144 ms — h2https://plausible.io/js/script.tagged-events.jsplausible.io/js/script.tagged-event... https://plausible.io/js/script.tagged-events.js — 200 — 2.5 KiB — 103 ms — h2https://matrix.org/images/element-creators-of-matrix--dark.svg/images/element-creators-of-matrix-... https://matrix.org/images/element-creators-of-matrix--dark.svg — 200 — 5.7 KiB — 82 ms — h2https://matrix.org/images/matrix-favicon.svg/images/matrix-favicon.svg https://matrix.org/images/matrix-favicon.svg — 200 — 1007 B — 82 ms — h2https://matrix.org/assets/frontpage/bridge-visual.svg/assets/frontpage/bridge-visual.svg https://matrix.org/assets/frontpage/bridge-visual.svg — 200 — 2.7 KiB — 82 ms — h2https://matrix.org/assets/frontpage/homeserver.svg/assets/frontpage/homeserver.svg https://matrix.org/assets/frontpage/homeserver.svg — 200 — 1.9 KiB — 51 ms — h2https://matrix.org/assets/frontpage/federation-visual.svg/assets/frontpage/federation-visual... https://matrix.org/assets/frontpage/federation-visual.svg — 200 — 4.1 KiB — 51 ms — h2https://matrix.org/assets/frontpage/github-mark.svg/assets/frontpage/github-mark.svg https://matrix.org/assets/frontpage/github-mark.svg — 200 — 873 B — 81 ms — h2https://matrix.org/assets/frontpage/hero_dancing_lines.svg/assets/frontpage/hero_dancing_line... https://matrix.org/assets/frontpage/hero_dancing_lines.svg — 200 — 22.7 KiB — 51 ms — h2https://matrix.org/assets/frontpage/personal-bg.svg/assets/frontpage/personal-bg.svg https://matrix.org/assets/frontpage/personal-bg.svg — 200 — 21.9 KiB — 53 ms — h2https://matrix.org/assets/frontpage/buildon-bg.svg/assets/frontpage/buildon-bg.svg https://matrix.org/assets/frontpage/buildon-bg.svg — 200 — 22.0 KiB — 55 ms — h2https://plausible.io/api/eventplausible.io/api/event https://plausible.io/api/event — 202 — 504 B — 120 ms — h2https://matrix.org/assets/favicon.svg/assets/favicon.svg https://matrix.org/assets/favicon.svg — 200 — 1.3 KiB — 44 ms — h2https://matrix.org/assets/favicon.ico/assets/favicon.ico https://matrix.org/assets/favicon.ico — 200 — 1.1 KiB — 46 ms — h2
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 86ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 86ms
Transfer 0 KB
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

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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