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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
62
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.
81
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.

2.60 s

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

9.91 s

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

58 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.115

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

6.08 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.

9.97 s

Page Load Progression

547 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
17
9 PASS 2 REVIEW 4 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (1.9 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
JS Execution Cost
Action
3233ms total JS execution
FIX
3233ms total JS execution
Warning::
https://rhizome.org/: 2426ms CPU time
Warning::
https://rhizome.org/cdn-cgi/challenge-platform/scr...: 341ms CPU time
Warning::
Unattributable: 283ms CPU time
Info::
https://static.rhizome.org/static/js/loadfx.ded2b1...: 104ms CPU time
Info::
https://static.rhizome.org/static/js/bundle.bb9e5a...: 79ms CPU time
Info::
Third-party scripts: 466ms (14% of total)

Main Thread Breakdown

Style & Layout 33% Other 31% Rendering 18% Script Evaluation 14%
ScriptTotalScriptingParse/CompileParty
https://rhizome.org/2426ms43ms3ms1st
https://rhizome.org/cdn-cgi/challenge-platform/scripts/jsd/main.js341ms328ms4ms1st
Unattributable283ms7ms0ms3rd
https://static.rhizome.org/static/js/loadfx.ded2b16e.js104ms13ms1ms3rd
https://static.rhizome.org/static/js/bundle.bb9e5a36.js79ms56ms8ms3rd
D
Page Weight Inventory
Action
27 resources · 2.0 MB · 0 KB savings available
FIX
27 resources · 2.0 MB · 0 KB savings available
Warning::
Page weight 990 KB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Warning::
21 third-party resources (99% of weight)
Info::
4 resources over 200KB
27 resources · 2.0 MiB · 21 third-party 990.1 KiB over 1MB target
Image 90% · 1.8 MiB
Font 6% · 121.0 KiB
CSS 2% · 37.3 KiB
JavaScript 2% · 34.2 KiB
Document 0% · 5.6 KiB
Other 0% · 2.4 KiB
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.

C
Page Weight Budget
Action
2.0 MB transferred, 27 requests
REVIEW
2.0 MB transferred, 27 requests
Info::
Page weighs 2.6 MB (2.0 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Info::
27 HTTP requests
Info::
Estimated 0.41 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
27 requests
0.41 g CO2 per page load
Images 1.8 MiB 90%
Fonts 121.0 KiB 6%
CSS 37.3 KiB 2%
JavaScript 34.2 KiB 2%
HTML 5.6 KiB 0%
Other 2.4 KiB 0%
Other 1.8 KiB 0%
Other 554 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://static.rhizome.org/media/cache/45/ca/45ca6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.rhizome.org/media/cache/c2/63/c2638... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.rhizome.org/media/cache/97/eb/97ebf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.rhizome.org/media/cache/3b/ea/3beae... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.rhizome.org/media/cache/80/91/80911... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 1.8 MB
0 oversized -0 KB
11 legacy format
5 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

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
2 fonts (121 KB)
PASS
2 fonts (121 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

121 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.6 s LCP 9.9 shttps://static.rhizome.org/static/fonts/u001-rhizome/U001-Reg-v2.4.woffU001-Reg-v2.4.woff https://static.rhizome.org/static/fonts/u001-rhizome/U001-Reg-v2.4.woff — 60.2 KiB — 29 ms — font-display: swaphttps://static.rhizome.org/static/fonts/u001-rhizome/U001-Bol-v2.4.woffU001-Bol-v2.4.woff https://static.rhizome.org/static/fonts/u001-rhizome/U001-Bol-v2.4.woff — 60.8 KiB — 23 ms — font-display: swap
U001-Reg-v2.4.woff woff swap
Size 60 KB
Load time 29 ms
Start 673 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
U001-Bol-v2.4.woff woff swap
Size 61 KB
Load time 23 ms
Start 674 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~36 KB and ~72 ms

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

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://u.rhizome.org/script.js2 KB—✓3rd
https://static.rhizome.org/static/js/loadfx.ded2b16e.js1 KB—✓3rd
https://rhizome.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://static.rhizome.org/static/js/bundle.bb9e5a36.js19 KB—✓3rd
https://rhizome.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓1st
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+
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
27 requests over 2777ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.6 s LCP 9.9 shttps://rhizome.org// https://rhizome.org/ — 200 — 5.6 KiB — 267 ms — h2https://u.rhizome.org/script.jsu.rhizome.org/script.js https://u.rhizome.org/script.js — 200 — 1.8 KiB — 795 ms — h2https://static.rhizome.org/static/css/style.e84c14f6.cssstatic.rhizome.org/static/css/style... https://static.rhizome.org/static/css/style.e84c14f6.css — 200 — 26.7 KiB — 331 ms — h2https://static.rhizome.org/static/js/loadfx.ded2b16e.jsstatic.rhizome.org/static/js/loadfx... https://static.rhizome.org/static/js/loadfx.ded2b16e.js — 200 — 559 B — 326 ms — h2https://static.rhizome.org/media/cache/25/25/252569a759364e03d1f3ba383ec112a2.jpgstatic.rhizome.org/media/cache/25/2... https://static.rhizome.org/media/cache/25/25/252569a759364e03d1f3ba383ec112a2.jpg — 200 — 46.5 KiB — 19 ms — h2https://static.rhizome.org/media/cache/97/eb/97ebf826ddfbac2a4d03e5527c124638.pngstatic.rhizome.org/media/cache/97/e... https://static.rhizome.org/media/cache/97/eb/97ebf826ddfbac2a4d03e5527c124638.png — 200 — 340.3 KiB — 321 ms — h2https://static.rhizome.org/media/cache/45/ca/45ca6b933a7d856f229d57f7fd0bd61a.jpgstatic.rhizome.org/media/cache/45/c... https://static.rhizome.org/media/cache/45/ca/45ca6b933a7d856f229d57f7fd0bd61a.jpg — 200 — 377.2 KiB — 330 ms — h2https://static.rhizome.org/media/cache/3b/ea/3beaebb5ee30d59ce369ecd485299187.jpgstatic.rhizome.org/media/cache/3b/e... https://static.rhizome.org/media/cache/3b/ea/3beaebb5ee30d59ce369ecd485299187.jpg — 200 — 321.7 KiB — 351 ms — h2https://rhizome.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://rhizome.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 753 B — 7 ms — h2https://static.rhizome.org/media/cache/c2/63/c263881b6f6d350df4c1002dab1b26a8.jpgstatic.rhizome.org/media/cache/c2/6... https://static.rhizome.org/media/cache/c2/63/c263881b6f6d350df4c1002dab1b26a8.jpg — 200 — 145.3 KiB — 343 ms — h2https://static.rhizome.org/static/js/bundle.bb9e5a36.jsstatic.rhizome.org/static/js/bundle... https://static.rhizome.org/static/js/bundle.bb9e5a36.js — 200 — 18.8 KiB — 35 ms — h2https://static.rhizome.org/media/cache/80/91/809111ac1f0f95f70bba8d9d8a129cf6.jpgstatic.rhizome.org/media/cache/80/9... https://static.rhizome.org/media/cache/80/91/809111ac1f0f95f70bba8d9d8a129cf6.jpg — 200 — 236.8 KiB — 311 ms — h2https://static.rhizome.org/static/fonts/u001-rhizome/U001-Reg-v2.4.woffstatic.rhizome.org/static/fonts/u00... https://static.rhizome.org/static/fonts/u001-rhizome/U001-Reg-v2.4.woff — 200 — 60.2 KiB — 29 ms — h2https://static.rhizome.org/static/fonts/u001-rhizome/U001-Bol-v2.4.woffstatic.rhizome.org/static/fonts/u00... https://static.rhizome.org/static/fonts/u001-rhizome/U001-Bol-v2.4.woff — 200 — 60.8 KiB — 23 ms — h2https://static.rhizome.org/static/css/index-module.4b6ff2ba.cssstatic.rhizome.org/static/css/index... https://static.rhizome.org/static/css/index-module.4b6ff2ba.css — 200 — 10.6 KiB — 268 ms — h2https://rhizome.org/api/v1/articleevent/search/?&limit=5&offset=0/api/v1/articleevent/search/?&limit... https://rhizome.org/api/v1/articleevent/search/?&limit=5&offset=0 — 200 — 1.3 KiB — 274 ms — h2https://rhizome.org/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://rhizome.org/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 141 B — 4 ms — h2https://rhizome.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://rhizome.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 12.3 KiB — 8 ms — h2https://rhizome.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f087be70ea70dbe/cdn-cgi/challenge-platform/h/b/jsd... https://rhizome.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f087be70ea70dbe — 200 — 554 B — 9 ms — h2https://u.rhizome.org/api/sendu.rhizome.org/api/send https://u.rhizome.org/api/send — 204 — 0 B — 1.1 s — h2https://static.rhizome.org/media/cache/95/3c/953ca535f07573c29c2a954bd8426058.pngstatic.rhizome.org/media/cache/95/3... https://static.rhizome.org/media/cache/95/3c/953ca535f07573c29c2a954bd8426058.png — 200 — 91.7 KiB — 370 ms — h2https://static.rhizome.org/media/cache/0f/96/0f96a9eff25f31476fec8e0a210e8d69.jpgstatic.rhizome.org/media/cache/0f/9... https://static.rhizome.org/media/cache/0f/96/0f96a9eff25f31476fec8e0a210e8d69.jpg — 200 — 99.1 KiB — 273 ms — h2https://static.rhizome.org/media/cache/0b/b0/0bb0ff5def0718d83deb6f554b23a7f6.jpgstatic.rhizome.org/media/cache/0b/b... https://static.rhizome.org/media/cache/0b/b0/0bb0ff5def0718d83deb6f554b23a7f6.jpg — 200 — 63.0 KiB — 251 ms — h2https://static.rhizome.org/media/cache/b6/f9/b6f9cffed3b489e03af89f87466e7ae7.jpgstatic.rhizome.org/media/cache/b6/f... https://static.rhizome.org/media/cache/b6/f9/b6f9cffed3b489e03af89f87466e7ae7.jpg — 200 — 51.4 KiB — 263 ms — h2https://static.rhizome.org/media/cache/7a/6e/7a6eae31a96ec3d04107ba5031e9baf0.jpgstatic.rhizome.org/media/cache/7a/6... https://static.rhizome.org/media/cache/7a/6e/7a6eae31a96ec3d04107ba5031e9baf0.jpg — 200 — 38.1 KiB — 275 ms — h2https://static.rhizome.org/media/favicon64x64.pngstatic.rhizome.org/media/favicon64x... https://static.rhizome.org/media/favicon64x64.png — 200 — 2.3 KiB — 9 ms — h2https://u.rhizome.org/api/sendu.rhizome.org/api/send https://u.rhizome.org/api/send — 200 — 471 B — 299 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
14% of JavaScript execution is third-party
First-party Third-party 466ms · 19KB · $6/mo
Unattributable
Other
Costly
Execution 283ms
Transfer 0 KB
Monthly Cost $4/mo
static.rhizome.org
Other
Optional
Execution 104ms
Transfer 1 KB
Monthly Cost $1/mo
static.rhizome.org
Other
Optional
Execution 79ms
Transfer 19 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 283ms and costs ~$4/month

Unattributable takes 283ms 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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