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https://opensocietyfoundations.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

570 ms

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

1.57 s

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

180 ms

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

0.050

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

1.53 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.

2.31 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
5 PASS 5 REVIEW 3 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
29 resources · 1.5 MB · 217 KB savings available
FIX
29 resources · 1.5 MB · 217 KB savings available
Warning::
Page weight 532 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~217 KB of savings available
Warning::
28 third-party resources (100% of weight)
Info::
1 resources over 200KB
29 resources · 1.5 MiB · 28 third-party 531.7 KiB over 1MB target
JavaScript 53% · 819.3 KiB
Image 25% · 385.5 KiB
Font 15% · 231.7 KiB
CSS 6% · 85.8 KiB
Document 1% · 23.2 KiB
Other 1% · 10.3 KiB

~217.2 KiB of savings available

Remove unused JavaScript: 217.2 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.

B
Page Weight Budget
1.5 MB transferred, 29 requests
REVIEW
1.5 MB transferred, 29 requests
Info::
Page weighs 4.3 MB (1.5 MB transferred)
Warning::
JavaScript is 819 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 819 KB
Info::
Fonts are 232 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 232 KB
Info::
29 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
29 requests
0.32 g CO2 per page load
JavaScript 819.3 KiB 53%
Images 378.4 KiB 24%
Fonts 231.7 KiB 15%
CSS 85.8 KiB 6%
HTML 23.2 KiB 1%
Other 9.6 KiB 1%
Other 6.1 KiB 0%
Other 1.2 KiB 0%
Other 416 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Warning::
https://opensocietyfoundations.imgix.net/uploads/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 378 KB
0 oversized -0 KB
3 legacy format
1 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

C
JS Execution Cost
Action
1376ms total JS execution
REVIEW
1376ms total JS execution
Warning::
https://www.opensocietyfoundations.org/dist/script...: 789ms CPU time
Info::
Unattributable: 188ms CPU time
Info::
https://www.opensocietyfoundations.org/: 175ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NNR...: 169ms CPU time
Info::
https://www.opensocietyfoundations.org/dist/script...: 55ms CPU time
Warning::
Third-party scripts: 1376ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 19% Style & Layout 11% Script Parsing & Compilation 7% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.opensocietyfoundations.org/dist/scripts/maps-400ffa8c35.js789ms575ms63ms3rd
Unattributable188ms5ms0ms3rd
https://www.opensocietyfoundations.org/175ms7ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NNRNV5Q169ms110ms19ms3rd
https://www.opensocietyfoundations.org/dist/scripts/app-05eb876a18.js55ms33ms15ms3rd
C
JS Bundles
Action
7 scripts, 217 KB unused
REVIEW
7 scripts, 217 KB unused
Warning::
https://www.opensocietyfoundations.org/dist/script...: 87 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NNR...: 65 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.opensocietyfoundations.org/dist/script...: 41 KB unused (8%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.matomo.cloud/theideasletter.matomo.clo...: 24 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 217 KB
217 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.opensocietyfoundations.org/dist/scripts/app-05eb876a18.js102 KB87 KB (86%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NNRNV5Q146 KB65 KB (44%)✓3rd
https://www.opensocietyfoundations.org/dist/scripts/maps-400ffa8c35.js511 KB41 KB (8%)✓3rd
https://cdn.matomo.cloud/theideasletter.matomo.cloud/matomo.js39 KB24 KB (63%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/picturefill/3.0.2/picturefill.min.js5 KB—✓3rd
https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/script.js9 KB—✓3rd
https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/banner.js8 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

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

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

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

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

Green Hosting

No green hosting detected

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
5 fonts (232 KB)
PASS
5 fonts (232 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

232 KB total

Render-blocking

0

of 5

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 4.0 s FCP 570 ms LCP 1.6 shttps://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Regular.woff2GT-America-Standard-Reg... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Regular.woff2 — 45.5 KiB — 49 ms — font-display: swaphttps://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Bold.woff2GT-America-Standard-Bol... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Bold.woff2 — 48.0 KiB — 12 ms — font-display: swaphttps://www.opensocietyfoundations.org/dist/fonts/GT-America-Compressed-Bold.woff2GT-America-Compressed-B... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Compressed-Bold.woff2 — 47.4 KiB — 14 ms — font-display: swaphttps://www.opensocietyfoundations.org/dist/fonts/LyonDisplay-Bold-Web.woff2LyonDisplay-Bold-Web.woff2 https://www.opensocietyfoundations.org/dist/fonts/LyonDisplay-Bold-Web.woff2 — 55.0 KiB — 16 ms — font-display: swaphttps://www.opensocietyfoundations.org/dist/fonts/GT-America-Mono-Regular.woff2GT-America-Mono-Regular... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Mono-Regular.woff2 — 35.8 KiB — 12 ms — font-display: swap
GT-America-Standard-Reg... woff2 swap
Size 45 KB
Load time 49 ms
Start 908 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Bol... woff2 swap
Size 48 KB
Load time 12 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
GT-America-Compressed-B... woff2 swap
Size 47 KB
Load time 14 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
LyonDisplay-Bold-Web.woff2 woff2 swap
Size 55 KB
Load time 16 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
GT-America-Mono-Regular... woff2 swap
Size 36 KB
Load time 12 ms
Start 4.3 s
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+
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
Network Waterfall
29 requests over 4263ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 570 ms LCP 1.6 shttps://opensocietyfoundations.org// https://opensocietyfoundations.org/ — 301 — 254 B — 557 ms — h2https://www.opensocietyfoundations.org/www.opensocietyfoundations.org/ https://www.opensocietyfoundations.org/ — 200 — 23.2 KiB — 299 ms — h2https://www.opensocietyfoundations.org/dist/styles/app-26c94e4767.csswww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/styles/app-26c94e4767.css — 200 — 85.8 KiB — 33 ms — h2https://opensocietyfoundations.imgix.net/uploads/9b241864-37fa-40a3-b76e-8b4038b9d35a/20230524-bhuyan-botswana-lgbtq-pride-3000.jpg?auto=compress%2Cformat&fit=min&fm=jpg&q=80&rect=622%2C0%2C1606%2C2021&w=1300opensocietyfoundations.imgix.net/up... https://opensocietyfoundations.imgix.net/uploads/9b241864-37fa-40a3-b76e-8b4038b9d35a/20230524-bhuyan-botswana-lgbtq-pride-3000.jpg?auto=compress%2Cformat&fit=min&fm=jpg&q=80&rect=622%2C0%2C1606%2C2021&w=1300 — 200 — 190.7 KiB — 63 ms — h2https://opensocietyfoundations.imgix.net/uploads/e9f02c84-c594-4a4c-991b-1c49c6b0e054/2007-george-soros-portrait-3000.jpg?auto=compress%2Cformat&fit=min&fm=jpg&h=645&q=80&rect=0%2C0%2C3000%2C1698&w=1140opensocietyfoundations.imgix.net/up... https://opensocietyfoundations.imgix.net/uploads/e9f02c84-c594-4a4c-991b-1c49c6b0e054/2007-george-soros-portrait-3000.jpg?auto=compress%2Cformat&fit=min&fm=jpg&h=645&q=80&rect=0%2C0%2C3000%2C1698&w=1140 — 200 — 70.8 KiB — 67 ms — h2https://www.opensocietyfoundations.org/dist/icons/icons.svgwww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/icons/icons.svg — 200 — 6.1 KiB — 17 ms — h2https://www.opensocietyfoundations.org/dist/scripts/app-05eb876a18.jswww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/scripts/app-05eb876a18.js — 200 — 101.7 KiB — 49 ms — h2https://www.opensocietyfoundations.org/dist/scripts/maps-400ffa8c35.jswww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/scripts/maps-400ffa8c35.js — 200 — 510.6 KiB — 77 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NNRNV5Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NNRNV5Q — 200 — 146.2 KiB — 70 ms — h2https://cdnjs.cloudflare.com/ajax/libs/picturefill/3.0.2/picturefill.min.jscdnjs.cloudflare.com/ajax/libs/pict... https://cdnjs.cloudflare.com/ajax/libs/picturefill/3.0.2/picturefill.min.js — 200 — 5.2 KiB — 34 ms — h3https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Regular.woff2www.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Regular.woff2 — 200 — 45.5 KiB — 49 ms — h2https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Bold.woff2www.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Standard-Bold.woff2 — 200 — 48.0 KiB — 12 ms — h2https://www.opensocietyfoundations.org/dist/fonts/GT-America-Compressed-Bold.woff2www.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Compressed-Bold.woff2 — 200 — 47.4 KiB — 14 ms — h2https://www.opensocietyfoundations.org/dist/fonts/LyonDisplay-Bold-Web.woff2www.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/fonts/LyonDisplay-Bold-Web.woff2 — 200 — 55.0 KiB — 16 ms — h2https://www.opensocietyfoundations.org/dist/images/map-v2.svgwww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/images/map-v2.svg — 200 — 114.5 KiB — 21 ms — h2https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/script.jscdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/script.js — 200 — 8.9 KiB — 39 ms — h2https://cdn.matomo.cloud/theideasletter.matomo.cloud/matomo.jscdn.matomo.cloud/theideasletter.mat... https://cdn.matomo.cloud/theideasletter.matomo.cloud/matomo.js — 200 — 39.0 KiB — 31 ms — h2https://www.opensocietyfoundations.org/dist/images/favicons/favicon.icowww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/images/favicons/favicon.ico — 200 — 285 B — 13 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 58 ms — h3https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/banner.jscdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/banner.js — 200 — 7.8 KiB — 11 ms — h2https://theideasletter.matomo.cloud/matomo.php?action_name=Open%20Society%20Foundations&idsite=2&rec=1&r=258099&h=23&m=16&s=24&url=https%3A%2F%2Fwww.opensocietyfoundations.org%2F&_id=&_idn=1&send_image=0&_refts=0&pv_id=biIdgy&fa_pv=1&fa_fp[0][fa_vid]=7XkaOR&fa_fp[0][fa_fv]=1&fa_fp[1][fa_vid]=kwI5BW&fa_fp[1][fa_fv]=1&fa_fp[2][fa_vid]=uvVelA&fa_fp[2][fa_fv]=1&pf_net=287&pf_srv=9&pf_tfr=4&pf_dm1=360&pf_dm2=63&pf_onl=589&uadata=%7B%7Dtheideasletter.matomo.cloud/matomo.... https://theideasletter.matomo.cloud/matomo.php?action_name=Open%20Society%20Foundations&idsite=2&rec=1&r=258099&h=23&m=16&s=24&url=https%3A%2F%2Fwww.opensocietyfoundations.org%2F&_id=&_idn=1&send_image=0&_refts=0&pv_id=biIdgy&fa_pv=1&fa_fp[0][fa_vid]=7XkaOR&fa_fp[0][fa_fv]=1&fa_fp[1][fa_vid]=kwI5BW&fa_fp[1][fa_fv]=1&fa_fp[2][fa_vid]=uvVelA&fa_fp[2][fa_fv]=1&pf_net=287&pf_srv=9&pf_tfr=4&pf_dm1=360&pf_dm2=63&pf_onl=589&uadata=%7B%7D — 204 — 156 B — 88 ms — h2https://www.opensocietyfoundations.org/dist/images/favicons/favicon-32.pngwww.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/images/favicons/favicon-32.png — 200 — 699 B — 10 ms — h2https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/2qMMI-UO.jsoncdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/2qMMI-UO.json — 200 — 333 B — 18 ms — h2https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/config/QkMgRJXD.jsoncdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/config/QkMgRJXD.json — 200 — 6.6 KiB — 9 ms — h2https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/translations/RtZJZQcY.jsoncdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/translations/RtZJZQcY.json — 200 — 890 B — 11 ms — h2https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/audit-table/Wa1ywUSb.jsoncdn-cookieyes.com/client_data/d5c9d... https://cdn-cookieyes.com/client_data/d5c9db975dc7fd2090aba4aa/audit-table/Wa1ywUSb.json — 200 — 1.8 KiB — 8 ms — h2https://cdn-cookieyes.com/assets/images/close.svgcdn-cookieyes.com/assets/images/clo... https://cdn-cookieyes.com/assets/images/close.svg — 200 — 787 B — 11 ms — h2https://cdn-cookieyes.com/assets/images/poweredbtcky.svgcdn-cookieyes.com/assets/images/pow... https://cdn-cookieyes.com/assets/images/poweredbtcky.svg — 200 — 1.6 KiB — 8 ms — h2https://www.opensocietyfoundations.org/dist/fonts/GT-America-Mono-Regular.woff2www.opensocietyfoundations.org/dist... https://www.opensocietyfoundations.org/dist/fonts/GT-America-Mono-Regular.woff2 — 200 — 35.8 KiB — 12 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 1376ms · 782KB · €15/mo
www.opensocietyfoundations.org
Other
Costly
Execution 789ms
Transfer 511 KB
Unused 8%
Monthly Cost €9/mo
Unattributable
Other
Optional
Execution 188ms
Transfer 0 KB
Monthly Cost €2/mo
www.opensocietyfoundations.org
Other
Optional
Execution 175ms
Transfer 23 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 169ms
Transfer 146 KB
Unused 44%
Monthly Cost €2/mo
www.opensocietyfoundations.org
Other
Optional
Execution 55ms
Transfer 102 KB
Unused 86%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.opensocietyfoundations.org adds 789ms and costs ~€9/month

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

www.opensocietyfoundations.org takes 789ms 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

86% of www.opensocietyfoundations.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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