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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
90
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.
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.

592 ms

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

1.58 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.

0.105

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

1.55 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.

1.58 s

Page Load Progression

433 ms
866 ms
1.3 s
1.7 s
2.2 s
2.6 s
3.0 s
3.5 s
Checks
15
7 PASS 2 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 32 requests
FIX
2.2 MB transferred, 32 requests
Info::
Page weighs 2.9 MB (2.2 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Info::
32 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
32 requests
0.46 g CO2 per page load
Images 2.0 MiB 91%
Fonts 121.0 KiB 5%
CSS 37.3 KiB 2%
JavaScript 33.0 KiB 1%
HTML 5.6 KiB 0%
Other 2.7 KiB 0%
Other 2.4 KiB 0%
Other 769 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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
Page Weight Inventory
Action
32 resources · 2.2 MB · 0 KB savings available
FIX
32 resources · 2.2 MB · 0 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Warning::
26 third-party resources (99% of weight)
Info::
4 resources over 200KB
32 resources · 2.2 MiB · 26 third-party 1.2 MiB over 1MB target
Image 91% · 2.0 MiB
Font 5% · 121.0 KiB
CSS 2% · 37.3 KiB
JavaScript 1% · 33.0 KiB
Document 0% · 5.6 KiB
Other 0% · 3.6 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
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 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/80/91/80911... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.rhizome.org/media/cache/25/25/25256... 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/c2/63/c2638... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 2.0 MB
0 oversized -0 KB
16 legacy format
6 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

B
JS Execution Cost
943ms total JS execution
REVIEW
943ms total JS execution
Warning::
https://rhizome.org/: 771ms CPU time
Info::
https://rhizome.org/cdn-cgi/challenge-platform/scr...: 94ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
Third-party scripts: 78ms (8% of total)

Main Thread Breakdown

Other 34% Style & Layout 31% Rendering 19% Script Evaluation 13%
ScriptTotalScriptingParse/CompileParty
https://rhizome.org/771ms13ms1ms1st
https://rhizome.org/cdn-cgi/challenge-platform/scripts/jsd/main.js94ms88ms1ms1st
Unattributable78ms2ms0ms3rd
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 500 ms 1.0 s 1.5 s FCP 592 ms LCP 1.6 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 — 31 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 — 34 ms — font-display: swap
U001-Reg-v2.4.woff woff swap
Size 60 KB
Load time 31 ms
Start 874 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 34 ms
Start 874 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?11 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+
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
32 requests over 2917ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 592 ms LCP 1.6 shttps://rhizome.org// https://rhizome.org/ — 200 — 5.6 KiB — 737 ms — h2https://u.rhizome.org/script.jsu.rhizome.org/script.js https://u.rhizome.org/script.js — 200 — 1.8 KiB — 803 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 — 38 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 — 564 B — 26 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 — 46.4 KiB — 27 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 — 340.4 KiB — 55 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 — 76 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 — 321.8 KiB — 104 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 — 18 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 — 97 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 — 96 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 — 103 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 — 31 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 — 34 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 — 14 ms — h2https://rhizome.org/api/v1/articleevent/search/?&limit=10&offset=0/api/v1/articleevent/search/?&limit... https://rhizome.org/api/v1/articleevent/search/?&limit=10&offset=0 — 200 — 2.2 KiB — 276 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 — 23 ms — h2https://u.rhizome.org/api/sendu.rhizome.org/api/send https://u.rhizome.org/api/send — 204 — 0 B — 1.1 s — 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 — 11.1 KiB — 8 ms — h2https://static.rhizome.org/media/favicon64x64.pngstatic.rhizome.org/media/favicon64x... https://static.rhizome.org/media/favicon64x64.png — 200 — 2.3 KiB — 11 ms — h2https://rhizome.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f087c515d6425fd/cdn-cgi/challenge-platform/h/b/jsd... https://rhizome.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.15003100145269122:1776899610:ocN79iLeoMzLIrbO7RufIK3kxf6HJgAQAGMI3HucTfc/9f087c515d6425fd — 200 — 769 B — 9 ms — 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 — 91.8 KiB — 17 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 — 25 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 — 34 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 — 51.3 KiB — 29 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 — 38 ms — h2https://static.rhizome.org/media/cache/da/0a/da0a33454f8abf8966c204f067ebbcf6.jpgstatic.rhizome.org/media/cache/da/0... https://static.rhizome.org/media/cache/da/0a/da0a33454f8abf8966c204f067ebbcf6.jpg — 200 — 97.9 KiB — 284 ms — h2https://static.rhizome.org/media/cache/81/fa/81fad0cb3093551b57826a149154adfb.jpgstatic.rhizome.org/media/cache/81/f... https://static.rhizome.org/media/cache/81/fa/81fad0cb3093551b57826a149154adfb.jpg — 200 — 27.5 KiB — 263 ms — h2https://static.rhizome.org/media/cache/9c/17/9c1794f31c612263ba96d68fcda2d0bb.jpgstatic.rhizome.org/media/cache/9c/1... https://static.rhizome.org/media/cache/9c/17/9c1794f31c612263ba96d68fcda2d0bb.jpg — 200 — 37.1 KiB — 257 ms — h2https://static.rhizome.org/media/cache/85/02/8502c9a799e92b9751ce43be567e2cd5.jpgstatic.rhizome.org/media/cache/85/0... https://static.rhizome.org/media/cache/85/02/8502c9a799e92b9751ce43be567e2cd5.jpg — 200 — 66.9 KiB — 334 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 592 ms LCP 1.6 shttps://rhizome.org// https://rhizome.org/ — 200 — 5.6 KiB — 737 ms — h2https://u.rhizome.org/script.jsu.rhizome.org/script.js https://u.rhizome.org/script.js — 200 — 1.8 KiB — 803 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 — 38 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 — 564 B — 26 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 — 46.4 KiB — 27 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 — 340.4 KiB — 55 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 — 76 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 — 321.8 KiB — 104 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 — 18 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 — 97 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 — 96 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 — 103 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 — 31 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 — 34 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 — 14 ms — h2https://rhizome.org/api/v1/articleevent/search/?&limit=10&offset=0/api/v1/articleevent/search/?&limit... https://rhizome.org/api/v1/articleevent/search/?&limit=10&offset=0 — 200 — 2.2 KiB — 276 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 — 23 ms — h2https://u.rhizome.org/api/sendu.rhizome.org/api/send https://u.rhizome.org/api/send — 204 — 0 B — 1.1 s — 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? 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
8% of JavaScript execution is third-party
First-party Third-party 78ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost $1/mo

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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