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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

886 ms

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

1.24 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.

0.033

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

942 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.

1.25 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
6 PASS 4 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
67 resources · 1.6 MB · 69 KB savings available
FIX
67 resources · 1.6 MB · 69 KB savings available
Warning::
Page weight 634 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~69 KB of savings available
Warning::
66 third-party resources (100% of weight)
Info::
2 resources over 200KB
67 resources · 1.6 MiB · 66 third-party 634.1 KiB over 1MB target
Image 71% · 1.2 MiB
JavaScript 21% · 352.5 KiB
Font 3% · 57.6 KiB
Other 2% · 28.2 KiB
Document 2% · 27.6 KiB
CSS 1% · 10.7 KiB

~69.0 KiB of savings available

Remove unused JavaScript: 69.0 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
1.6 MB transferred, 67 requests
REVIEW
1.6 MB transferred, 67 requests
Info::
Page weighs 2.7 MB (1.6 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
67 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
67 requests
0.34 g CO2 per page load
Images 1.2 MiB 71%
JavaScript 352.5 KiB 21%
Fonts 57.6 KiB 3%
Other 27.6 KiB 2%
HTML 26.9 KiB 2%
CSS 10.7 KiB 1%
Other 3.1 KiB 0%
Other 546 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

B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 1.2 MB
0 oversized -0 KB
23 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
616ms total JS execution
REVIEW
616ms total JS execution
Warning::
https://openjsf.org/: 354ms CPU time
Info::
Unattributable: 126ms CPU time
Info::
https://openjsf.org/_next/static/chunks/2472-14c99...: 70ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-KXSQ...: 67ms CPU time
Warning::
Third-party scripts: 616ms (100% of total)

Main Thread Breakdown

Other 54% Script Evaluation 26% Style & Layout 9% Rendering 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://openjsf.org/354ms4ms3ms3rd
Unattributable126ms9ms0ms3rd
https://openjsf.org/_next/static/chunks/2472-14c999249dcf1e0b.js70ms63ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY867ms56ms10ms3rd
B
JS Bundles
20 scripts, 69 KB unused
REVIEW
20 scripts, 69 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KXSQ...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 69 KB
69 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8171 KB69 KB (40%)✓3rd
https://openjsf.org/_next/static/chunks/webpack-c6bb47536c0fe486.js3 KB—✓3rd
https://openjsf.org/_next/static/chunks/fd9d1056-28f899536b16494f.js54 KB—✓3rd
https://openjsf.org/_next/static/chunks/2472-14c999249dcf1e0b.js29 KB—✓3rd
https://openjsf.org/_next/static/chunks/main-app-eabf6ceaa8888f8a.js1 KB—✓3rd
https://openjsf.org/_next/static/chunks/8326-3dcfcc2aa14b8985.js7 KB—✓3rd
https://openjsf.org/_next/static/chunks/6691-f3273306b9b7e0df.js5 KB—✓3rd
https://openjsf.org/_next/static/chunks/9492-8ece23403f4ea0e5.js16 KB—✓3rd
https://openjsf.org/_next/static/chunks/4169-45f83c9c98c4cb1e.js10 KB—✓3rd
https://openjsf.org/_next/static/chunks/1405-a8a34230eac0da75.js10 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+
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 (58 KB)
PASS
2 fonts (58 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

58 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 FCP 886 ms LCP 1.2 shttps://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2d3ebbfd689654d3a-s.p.woff2 https://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2 — 10.0 KiB — 32 ms — font-display: swaphttps://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.6 KiB — 31 ms — font-display: swap
d3ebbfd689654d3a-s.p.woff2 woff2 swap
Size 10 KB
Load time 32 ms
Start 511 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 31 ms
Start 512 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+
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
67 requests over 1427ms
INFO
0 ms 500 ms 1.0 s FCP 886 ms LCP 1.2 shttps://jquery.org// https://jquery.org/ — 301 — 746 B — 410 ms — h2https://openjsf.org/openjsf.org/ https://openjsf.org/ — 200 — 19.4 KiB — 92 ms — h2https://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2openjsf.org/_next/static/media/d3eb... https://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2 — 200 — 10.0 KiB — 32 ms — h2https://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2openjsf.org/_next/static/media/e4af... https://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.6 KiB — 31 ms — h2https://openjsf.org/_next/static/css/5e00fae1b590cd18.cssopenjsf.org/_next/static/css/5e00fa... https://openjsf.org/_next/static/css/5e00fae1b590cd18.css — 200 — 10.7 KiB — 64 ms — h2https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8 — 200 — 171.0 KiB — 184 ms — h2https://images.prismic.io/openjsf/bef1c599-573e-4764-b0a6-9bc3bccfe4b4_52907681865_e483942d88_o.jpg?auto=compress%2Cformat&rect=729%2C112%2C1671%2C1114&h=1600&width=640images.prismic.io/openjsf/bef1c599-... https://images.prismic.io/openjsf/bef1c599-573e-4764-b0a6-9bc3bccfe4b4_52907681865_e483942d88_o.jpg?auto=compress%2Cformat&rect=729%2C112%2C1671%2C1114&h=1600&width=640 — 200 — 40.3 KiB — 19 ms — h2https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=2048images.prismic.io/openjsf/bf362099-... https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=2048 — 200 — 426.9 KiB — 39 ms — h2https://images.prismic.io/openjsf/fee76461-04d1-4388-8adb-78cffb538999_IMG_1653+%281%29.jpg?auto=compress%2Cformat&rect=0%2C0%2C2048%2C1366&h=1366&width=2048images.prismic.io/openjsf/fee76461-... https://images.prismic.io/openjsf/fee76461-04d1-4388-8adb-78cffb538999_IMG_1653+%281%29.jpg?auto=compress%2Cformat&rect=0%2C0%2C2048%2C1366&h=1366&width=2048 — 200 — 186.1 KiB — 17 ms — h2https://images.prismic.io/openjsf/aS3iAHNYClf9np1M_54860935756_aaa652f1fd_o.jpg?auto=format%2Ccompress&width=2048images.prismic.io/openjsf/aS3iAHNYC... https://images.prismic.io/openjsf/aS3iAHNYClf9np1M_54860935756_aaa652f1fd_o.jpg?auto=format%2Ccompress&width=2048 — 200 — 73.9 KiB — 23 ms — h2https://images.prismic.io/openjsf/aS3h_3NYClf9np1L_54856724760_476d093937_o.jpg?auto=format%2Ccompress&width=2048images.prismic.io/openjsf/aS3h_3NYC... https://images.prismic.io/openjsf/aS3h_3NYClf9np1L_54856724760_476d093937_o.jpg?auto=format%2Ccompress&width=2048 — 200 — 250.8 KiB — 34 ms — h2https://openjsf.org/_next/static/chunks/webpack-c6bb47536c0fe486.jsopenjsf.org/_next/static/chunks/web... https://openjsf.org/_next/static/chunks/webpack-c6bb47536c0fe486.js — 200 — 2.8 KiB — 41 ms — h2https://openjsf.org/_next/static/chunks/fd9d1056-28f899536b16494f.jsopenjsf.org/_next/static/chunks/fd9... https://openjsf.org/_next/static/chunks/fd9d1056-28f899536b16494f.js — 200 — 53.7 KiB — 60 ms — h2https://openjsf.org/_next/static/chunks/2472-14c999249dcf1e0b.jsopenjsf.org/_next/static/chunks/247... https://openjsf.org/_next/static/chunks/2472-14c999249dcf1e0b.js — 200 — 29.4 KiB — 58 ms — h2https://openjsf.org/_next/static/chunks/main-app-eabf6ceaa8888f8a.jsopenjsf.org/_next/static/chunks/mai... https://openjsf.org/_next/static/chunks/main-app-eabf6ceaa8888f8a.js — 200 — 646 B — 40 ms — h2https://openjsf.org/_next/static/chunks/8326-3dcfcc2aa14b8985.jsopenjsf.org/_next/static/chunks/832... https://openjsf.org/_next/static/chunks/8326-3dcfcc2aa14b8985.js — 200 — 7.2 KiB — 44 ms — h2https://openjsf.org/_next/static/chunks/6691-f3273306b9b7e0df.jsopenjsf.org/_next/static/chunks/669... https://openjsf.org/_next/static/chunks/6691-f3273306b9b7e0df.js — 200 — 5.5 KiB — 37 ms — h2https://openjsf.org/_next/static/chunks/9492-8ece23403f4ea0e5.jsopenjsf.org/_next/static/chunks/949... https://openjsf.org/_next/static/chunks/9492-8ece23403f4ea0e5.js — 200 — 16.3 KiB — 46 ms — h2https://openjsf.org/_next/static/chunks/4169-45f83c9c98c4cb1e.jsopenjsf.org/_next/static/chunks/416... https://openjsf.org/_next/static/chunks/4169-45f83c9c98c4cb1e.js — 200 — 9.6 KiB — 50 ms — h2https://openjsf.org/_next/static/chunks/1405-a8a34230eac0da75.jsopenjsf.org/_next/static/chunks/140... https://openjsf.org/_next/static/chunks/1405-a8a34230eac0da75.js — 200 — 9.8 KiB — 46 ms — h2https://openjsf.org/_next/static/chunks/9762-c0c03675873abe1e.jsopenjsf.org/_next/static/chunks/976... https://openjsf.org/_next/static/chunks/9762-c0c03675873abe1e.js — 200 — 13.1 KiB — 43 ms — h2https://openjsf.org/_next/static/chunks/app/layout-7bc1439118b604c1.jsopenjsf.org/_next/static/chunks/app... https://openjsf.org/_next/static/chunks/app/layout-7bc1439118b604c1.js — 200 — 3.9 KiB — 40 ms — h2https://openjsf.org/_next/static/chunks/8568-3f47a68d439b28db.jsopenjsf.org/_next/static/chunks/856... https://openjsf.org/_next/static/chunks/8568-3f47a68d439b28db.js — 200 — 2.6 KiB — 35 ms — h2https://openjsf.org/_next/static/chunks/6705-4d8a879a8a3a8543.jsopenjsf.org/_next/static/chunks/670... https://openjsf.org/_next/static/chunks/6705-4d8a879a8a3a8543.js — 200 — 6.6 KiB — 40 ms — h2https://openjsf.org/_next/static/chunks/4502-bf59d83cd1153333.jsopenjsf.org/_next/static/chunks/450... https://openjsf.org/_next/static/chunks/4502-bf59d83cd1153333.js — 200 — 4.1 KiB — 43 ms — h2https://openjsf.org/_next/static/chunks/3035-138bdcd25f9f1de3.jsopenjsf.org/_next/static/chunks/303... https://openjsf.org/_next/static/chunks/3035-138bdcd25f9f1de3.js — 200 — 4.0 KiB — 40 ms — h2https://openjsf.org/_next/static/chunks/app/page-cbf4c156ea84a3da.jsopenjsf.org/_next/static/chunks/app... https://openjsf.org/_next/static/chunks/app/page-cbf4c156ea84a3da.js — 200 — 395 B — 31 ms — h2https://openjsf.org/_next/image?url=%2Flogo.svg&w=640&q=75openjsf.org/_next/image?url=%2Flogo... https://openjsf.org/_next/image?url=%2Flogo.svg&w=640&q=75 — 200 — 2.9 KiB — 34 ms — h2https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F0c5994ca-d214-4513-9ca2-3d635811c59f_Node.js_logo%2B1.svg&w=640&q=75openjsf.org/_next/image?url=https%3... https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F0c5994ca-d214-4513-9ca2-3d635811c59f_Node.js_logo%2B1.svg&w=640&q=75 — 200 — 3.8 KiB — 33 ms — h2https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F6b8d1369-b611-4ceb-8190-f4ea7b8d54e7_JQuery_logo%2B1.svg&w=640&q=75openjsf.org/_next/image?url=https%3... https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F6b8d1369-b611-4ceb-8190-f4ea7b8d54e7_JQuery_logo%2B1.svg&w=640&q=75 — 200 — 8.8 KiB — 42 ms — h2
0 ms 500 ms 1.0 s FCP 886 ms LCP 1.2 shttps://jquery.org// https://jquery.org/ — 301 — 746 B — 410 ms — h2https://openjsf.org/openjsf.org/ https://openjsf.org/ — 200 — 19.4 KiB — 92 ms — h2https://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2openjsf.org/_next/static/media/d3eb... https://openjsf.org/_next/static/media/d3ebbfd689654d3a-s.p.woff2 — 200 — 10.0 KiB — 32 ms — h2https://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2openjsf.org/_next/static/media/e4af... https://openjsf.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.6 KiB — 31 ms — h2https://openjsf.org/_next/static/css/5e00fae1b590cd18.cssopenjsf.org/_next/static/css/5e00fa... https://openjsf.org/_next/static/css/5e00fae1b590cd18.css — 200 — 10.7 KiB — 64 ms — h2https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8 — 200 — 171.0 KiB — 184 ms — h2https://images.prismic.io/openjsf/bef1c599-573e-4764-b0a6-9bc3bccfe4b4_52907681865_e483942d88_o.jpg?auto=compress%2Cformat&rect=729%2C112%2C1671%2C1114&h=1600&width=640images.prismic.io/openjsf/bef1c599-... https://images.prismic.io/openjsf/bef1c599-573e-4764-b0a6-9bc3bccfe4b4_52907681865_e483942d88_o.jpg?auto=compress%2Cformat&rect=729%2C112%2C1671%2C1114&h=1600&width=640 — 200 — 40.3 KiB — 19 ms — h2https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=2048images.prismic.io/openjsf/bf362099-... https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=2048 — 200 — 426.9 KiB — 39 ms — h2https://images.prismic.io/openjsf/fee76461-04d1-4388-8adb-78cffb538999_IMG_1653+%281%29.jpg?auto=compress%2Cformat&rect=0%2C0%2C2048%2C1366&h=1366&width=2048images.prismic.io/openjsf/fee76461-... 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https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F53d21a79-35ed-4fe4-8288-12728d1a8e0b_68747470733a2f2f636c6475702e636f6d2f78465646784f696f41552e737667.svg&w=256&q=75 — 200 — 3.4 KiB — 51 ms — h2https://static.cdn.prismic.io/prismic.js?new=true&repo=openjsfstatic.cdn.prismic.io/prismic.js?ne... https://static.cdn.prismic.io/prismic.js?new=true&repo=openjsf — 200 — 9.8 KiB — 14 ms — h2https://openjsf.org/_next/static/chunks/app/blog/page-4be1b200bf43de2b.jsopenjsf.org/_next/static/chunks/app... https://openjsf.org/_next/static/chunks/app/blog/page-4be1b200bf43de2b.js — 200 — 566 B — 35 ms — h2https://openjsf.prismic.io/prismic-toolbar/4.1.2/iframe.htmlopenjsf.prismic.io/prismic-toolbar/... https://openjsf.prismic.io/prismic-toolbar/4.1.2/iframe.html — 200 — 7.5 KiB — 341 ms — h2https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2Fa3012698-ae0a-4585-9a5d-5febee51ac6b_nvm-logo-color.svg&w=384&q=75openjsf.org/_next/image?url=https%3... https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2Fa3012698-ae0a-4585-9a5d-5febee51ac6b_nvm-logo-color.svg&w=384&q=75 — 200 — 1.9 KiB — 31 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 616ms · 220KB · €7/mo
openjsf.org
Other
Costly
Execution 354ms
Transfer 19 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 126ms
Transfer 0 KB
Monthly Cost €1/mo
openjsf.org
Other
Optional
Execution 70ms
Transfer 29 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 171 KB
Unused 40%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • openjsf.org adds 354ms and costs ~€4/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

openjsf.org takes 354ms 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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