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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.42 s

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

1.93 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.

0.139

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

1.42 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.

1.93 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
9 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
74% third-party, 0 ms blocking
FIX
74% third-party, 0 ms blocking
Warning::
Third-party code accounts for 74% of page weight (753.5 KiB of 1017.1 KiB)
Info::
Third-party blocking time is low (0 ms)
26%
74%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.openedition.org/docannexe/image/0/vign... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/text... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/sour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/late... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/vign... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/600x... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/foot... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openedition.org/docannexe/image/0/3_vi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.openedition.org/openedition/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.openedition.org/openedition/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 290 KB
0 oversized -0 KB
32 legacy format
10 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

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

Green Hosting

No green hosting detected

A
Page Weight Budget
1017 KB transferred, 85 requests
PASS
1017 KB transferred, 85 requests
Info::
Page weighs 1.4 MB (1017 KB transferred)
Info::
Fonts are 331 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 331 KB
Info::
CSS is 220 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 220 KB
Info::
85 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1017 KB / 2.4 MB budget
1017 KB transferred
85 requests
0.21 g CO2 per page load
Fonts 330.7 KiB 33%
Images 289.5 KiB 28%
CSS 220.4 KiB 22%
JavaScript 129.8 KiB 13%
HTML 38.7 KiB 4%
Other 5.6 KiB 1%
Other 1.8 KiB 0%
Other 393 B 0%
Other 142 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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
349ms total JS execution
PASS
349ms total JS execution
Info::
https://www.openedition.org/: 185ms CPU time
Info::
Unattributable: 97ms CPU time
Info::
https://static.openedition.org/js/jquery-1.4.4.min...: 68ms CPU time
Warning::
Third-party scripts: 349ms (100% of total)

Main Thread Breakdown

Style & Layout 43% Other 33% Script Evaluation 12% Rendering 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.openedition.org/185ms1ms1ms3rd
Unattributable97ms4ms0ms3rd
https://static.openedition.org/js/jquery-1.4.4.min.js68ms25ms2ms3rd
A+
Font Loading
10 fonts (331 KB)
PASS
10 fonts (331 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

331 KB total

Render-blocking

0

of 10

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 FCP 1.4 s LCP 1.9 sdata:font/woff2;base64,d09GMgABAAAAAOykABQAAAACdZgAAOwyAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGoUNG4LYfByR…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAOykABQAAAACdZgAAOwyAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGoUNG4LYfByR… — 59.2 KiB — 17 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAPq4ABUAAAACTIQAAPo7AAFmqAAAAAAAAAAAAAAAAAAAAAAAAAAAGokqG4Hrchya…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAPq4ABUAAAACTIQAAPo7AAFmqAAAAAAAAAAAAAAAAAAAAAAAAAAAGokqG4Hrchya… — 62.7 KiB — 19 ms — font-display: swaphttps://static.openedition.org/openbarre_/fonts/roboto-400.woff2roboto-400.woff2 https://static.openedition.org/openbarre_/fonts/roboto-400.woff2 — 15.5 KiB — 105 ms — font-display: swaphttps://fonts.gstatic.com/s/droidserif/v20/tDbK2oqRg1oM3QBjjcaDkOr4nAfcHi6FRUI.woff2tDbK2oqRg1oM3QBjjcaDkOr... https://fonts.gstatic.com/s/droidserif/v20/tDbK2oqRg1oM3QBjjcaDkOr4nAfcHi6FRUI.woff2 — 10.1 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hJW36eA1Ef.woff2KFO9CniXp96a4Tc2DaTeuDA... https://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hJW36eA1Ef.woff2 — 42.4 KiB — 85 ms — font-display: swaphttps://fonts.gstatic.com/s/asap/v34/KFO7CniXp96ayz4E7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CniXp96ayz4E7kSn66a... https://fonts.gstatic.com/s/asap/v34/KFO7CniXp96ayz4E7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 47.0 KiB — 82 ms — font-display: swaphttps://fonts.gstatic.com/s/asap/v34/KFO7CniXp96ayz4E7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2KFO7CniXp96ayz4E7kSn66a... https://fonts.gstatic.com/s/asap/v34/KFO7CniXp96ayz4E7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2 — 35.5 KiB — 82 ms — font-display: swaphttps://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hHW36eA1EfWzU.woff2KFO9CniXp96a4Tc2DaTeuDA... https://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hHW36eA1EfWzU.woff2 — 31.6 KiB — 77 ms — font-display: swaphttps://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hGW36eA1EfWzU.woff2KFO9CniXp96a4Tc2DaTeuDA... https://fonts.gstatic.com/s/asap/v34/KFO9CniXp96a4Tc2DaTeuDAoKsE615hGW36eA1EfWzU.woff2 — 11.2 KiB — 59 ms — font-display: swaphttps://static.openedition.org/openbarre_/fonts/roboto-500.woff2roboto-500.woff2 https://static.openedition.org/openbarre_/fonts/roboto-500.woff2 — 15.7 KiB — 97 ms — font-display: swap
woff2;base64,d09GMgABAA... woff2 swap
Size 59 KB
Load time 17 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 63 KB
Load time 19 ms
Start 199 ms
Risk FOUT — text flashes from fallback to web font
roboto-400.woff2 woff2 swap
Size 15 KB
Load time 105 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
tDbK2oqRg1oM3QBjjcaDkOr... woff2 swap
Size 10 KB
Load time 26 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
KFO9CniXp96a4Tc2DaTeuDA... woff2 swap
Size 42 KB
Load time 85 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
KFO7CniXp96ayz4E7kSn66a... woff2 swap
Size 47 KB
Load time 82 ms
Start 574 ms
Risk FOUT — text flashes from fallback to web font
KFO7CniXp96ayz4E7kSn66a... woff2 swap
Size 36 KB
Load time 82 ms
Start 576 ms
Risk FOUT — text flashes from fallback to web font
KFO9CniXp96a4Tc2DaTeuDA... woff2 swap
Size 32 KB
Load time 77 ms
Start 577 ms
Risk FOUT — text flashes from fallback to web font
KFO9CniXp96a4Tc2DaTeuDA... woff2 swap
Size 11 KB
Load time 59 ms
Start 578 ms
Risk FOUT — text flashes from fallback to web font
roboto-500.woff2 woff2 swap
Size 16 KB
Load time 97 ms
Start 601 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
17 scripts, 37 KB unused
PASS
17 scripts, 37 KB unused
Warning::
https://analytics.openedition.org/matomo.js: 37 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 37 KB
37 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://analytics.openedition.org/matomo.js67 KB37 KB (55%)✓3rd
https://static.openedition.org/openedition/js/rhino/js/rhinoslider-1.05.min.js4 KB—✓3rd
https://static.openedition.org/openedition/js/main.js2 KB—✓3rd
https://static.openedition.org/js/jquery-1.4.4.min.js27 KB—✓3rd
https://static.openedition.org/openedition/js/jquery-ui/jquery-ui-1.7.2.custom.min.js14 KB—✓3rd
https://static.openedition.org/openedition/js/jquery-ui/jquery.ui.datepicker-fr.js1 KB—✓3rd
https://static.openedition.org/openedition/js/home.js2 KB—✓3rd
https://openedition.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.25.00 KB—✓1st
https://static.openedition.org/openedition/js/home.calenda.js1 KB—✓3rd
https://static.openedition.org/openedition/js/rhino/js/mousewheel.js1 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
85 resources · 1017 KB · 37 KB savings available
PASS
85 resources · 1017 KB · 37 KB savings available
Info::
Within 1MB page-weight target
Got: 1017 KB
Warning::
74 third-party resources (74% of weight)
85 resources · 1017.1 KiB · 74 third-party Within 1MB page-weight target
Font 33% · 330.7 KiB
Image 29% · 290.6 KiB
CSS 22% · 220.4 KiB
JavaScript 13% · 129.8 KiB
Document 4% · 39.7 KiB
Other 1% · 5.9 KiB

~37.0 KiB of savings available

Remove unused JavaScript: 37.0 KiB
Network Waterfall
85 requests over 838ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 1.9 shttps://openedition.org// https://openedition.org/ — 200 — 2.6 KiB — 71 ms — h2https://openedition.org/.within.website/x/xess/xess.min.css?cachebuster=1.25.0/.within.website/x/xess/xess.min.cs... https://openedition.org/.within.website/x/xess/xess.min.css?cachebuster=1.25.0 — 200 — 190.4 KiB — 115 ms — h2https://openedition.org/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=1.25.0/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=1.25.0 — 200 — 28.3 KiB — 72 ms — h2https://openedition.org/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=1.25.0/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=1.25.0 — 200 — 30.0 KiB — 49 ms — h2https://openedition.org/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=1.25.0/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=1.25.0 — 200 — 5.8 KiB — 71 ms — h2https://openedition.org/.within.website/x/cmd/anubis/static/locales/en.json/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/locales/en.json — 200 — 5.6 KiB — 41 ms — h2data:font/woff2;base64,d09GMgABAAAAAOykABQAAAACdZgAAOwyAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGoUNG4LYfByR…data:font/woff2;base64,d09GMgABAAAA... data:font/woff2;base64,d09GMgABAAAAAOykABQAAAACdZgAAOwyAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGoUNG4LYfByR… — 200 — 59.2 KiB — 17 ms — datadata:font/woff2;base64,d09GMgABAAAAAPq4ABUAAAACTIQAAPo7AAFmqAAAAAAAAAAAAAAAAAAAAAAAAAAAGokqG4Hrchya…data:font/woff2;base64,d09GMgABAAAA... data:font/woff2;base64,d09GMgABAAAAAPq4ABUAAAACTIQAAPo7AAFmqAAAAAAAAAAAAAAAAAAAAAAAAAAAGokqG4Hrchya… — 200 — 62.7 KiB — 19 ms — datahttps://openedition.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.25.0/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.25.0 — 200 — 112 B — 34 ms — h2https://openedition.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.25.0/.within.website/x/cmd/anubis/stati... https://openedition.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.25.0 — 200 — 0 B — 35 ms — h2https://openedition.org/favicon.ico/favicon.ico https://openedition.org/favicon.ico — -1 — 0 B — 26 ms — https://openedition.org/.within.website/x/cmd/anubis/api/pass-challenge?id=019db1e0-57e4-7c06-b40d-dc6e7f29fab8&response=00618790568216c5340e76e62b1ede1d9e291cfd9def0f138eaa716ca531fe60&nonce=363&redir=https%3A%2F%2Fopenedition.org%2F&elapsedTime=40/.within.website/x/cmd/anubis/api/p... https://openedition.org/.within.website/x/cmd/anubis/api/pass-challenge?id=019db1e0-57e4-7c06-b40d-dc6e7f29fab8&response=00618790568216c5340e76e62b1ede1d9e291cfd9def0f138eaa716ca531fe60&nonce=363&redir=https%3A%2F%2Fopenedition.org%2F&elapsedTime=40 — 302 — 685 B — 28 ms — h2https://openedition.org// https://openedition.org/ — 301 — 131 B — 26 ms — h2http://www.openedition.org/www.openedition.org/ http://www.openedition.org/ — 307 — 0 B — 2 ms — http/1.1https://www.openedition.org/www.openedition.org/ https://www.openedition.org/ — 200 — 36.1 KiB — 28 ms — h2https://static.openedition.org/js/jquery-1.4.4.min.jsstatic.openedition.org/js/jquery-1.... https://static.openedition.org/js/jquery-1.4.4.min.js — 200 — 26.6 KiB — 34 ms — h2https://static.openedition.org/css/normalize.css?upd=20180212static.openedition.org/css/normaliz... https://static.openedition.org/css/normalize.css?upd=20180212 — 200 — 2.7 KiB — 30 ms — h2https://static.openedition.org/openbarre_/styles/main.css?date=2018-11-06static.openedition.org/openbarre_/s... https://static.openedition.org/openbarre_/styles/main.css?date=2018-11-06 — 200 — 7.0 KiB — 38 ms — h2https://static.openedition.org/openedition/css/layout.css?upd=20180212static.openedition.org/openedition/... https://static.openedition.org/openedition/css/layout.css?upd=20180212 — 200 — 998 B — 34 ms — h2https://static.openedition.org/openedition/css/main.css?upd=20180212static.openedition.org/openedition/... https://static.openedition.org/openedition/css/main.css?upd=20180212 — 200 — 3.1 KiB — 27 ms — h2https://static.openedition.org/openedition/css/media_main.css?upd=20180212static.openedition.org/openedition/... https://static.openedition.org/openedition/css/media_main.css?upd=20180212 — 200 — 960 B — 32 ms — h2https://static.openedition.org/openedition/css/openedition.css?upd=20250205static.openedition.org/openedition/... 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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
100% of JavaScript execution is third-party
First-party Third-party 349ms · 63KB · $5/mo
www.openedition.org
Other
Optional
Execution 185ms
Transfer 36 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 97ms
Transfer 0 KB
Monthly Cost $1/mo
static.openedition.org
Other
Optional
Execution 68ms
Transfer 27 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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