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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

2.18 s

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

4.89 s

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

117 ms

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

0.000

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

2.18 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.

6.16 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
17
10 PASS 3 REVIEW 2 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 (741.3 KiB of 742.1 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Image Optimization
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Info::
All images are well-optimized
34 images 278 KB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1885ms total JS execution
REVIEW
1885ms total JS execution
Warning::
https://openjsf.org/: 646ms CPU time
Warning::
Unattributable: 491ms CPU time
Warning::
https://openjsf.org/_next/static/chunks/2472-14c99...: 309ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KXSQ...: 281ms CPU time
Info::
https://openjsf.org/_next/static/chunks/fd9d1056-2...: 159ms CPU time
Warning::
Third-party scripts: 1885ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 34% Style & Layout 14% Rendering 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://openjsf.org/646ms15ms15ms3rd
Unattributable491ms15ms0ms3rd
https://openjsf.org/_next/static/chunks/2472-14c999249dcf1e0b.js309ms282ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KXSQNYYCY8281ms235ms43ms3rd
https://openjsf.org/_next/static/chunks/fd9d1056-28f899536b16494f.js159ms116ms13ms3rd
B
JS Bundles
19 scripts, 69 KB unused
REVIEW
19 scripts, 69 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KXSQ...: 69 KB unused (41%)
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 (41%)✓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.js6 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
Page Weight Budget
742 KB transferred, 64 requests
PASS
742 KB transferred, 64 requests
Info::
Page weighs 1.7 MB (742 KB transferred)
Info::
64 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
742 KB / 2.4 MB budget
742 KB transferred
64 requests
0.15 g CO2 per page load
JavaScript 352.0 KiB 47%
Images 278.1 KiB 37%
Fonts 57.6 KiB 8%
HTML 26.9 KiB 4%
Other 13.1 KiB 2%
CSS 10.7 KiB 1%
Other 3.1 KiB 0%
Other 555 B 0%
0 2.4 MB 4.9 MB
Under budget
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.2 s LCP 4.9 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 — 30 ms — font-display: swap
d3ebbfd689654d3a-s.p.woff2 woff2 swap
Size 10 KB
Load time 32 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 30 ms
Start 523 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

A
Page Weight Inventory
64 resources · 742 KB · 69 KB savings available
PASS
64 resources · 742 KB · 69 KB savings available
Info::
Within 1MB page-weight target
Got: 742 KB
Info::
~69 KB of savings available
Warning::
63 third-party resources (100% of weight)
64 resources · 742.1 KiB · 63 third-party Within 1MB page-weight target
JavaScript 47% · 352.0 KiB
Image 38% · 280.5 KiB
Font 8% · 57.6 KiB
Document 4% · 27.6 KiB
Other 2% · 13.7 KiB
CSS 1% · 10.7 KiB

~69.5 KiB of savings available

Remove unused JavaScript: 69.5 KiB
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
64 requests over 1545ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.2 s LCP 4.9 shttps://jquery.org// https://jquery.org/ — 301 — 746 B — 418 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 — 30 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 — 32 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 — 180 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 — 72 ms — h2https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=828images.prismic.io/openjsf/bf362099-... https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=828 — 200 — 31.5 KiB — 71 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=828images.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=828 — 200 — 43.5 KiB — 68 ms — h2https://images.prismic.io/openjsf/aS3iAHNYClf9np1M_54860935756_aaa652f1fd_o.jpg?auto=format%2Ccompress&width=828images.prismic.io/openjsf/aS3iAHNYC... https://images.prismic.io/openjsf/aS3iAHNYClf9np1M_54860935756_aaa652f1fd_o.jpg?auto=format%2Ccompress&width=828 — 200 — 25.6 KiB — 86 ms — h2https://images.prismic.io/openjsf/aS3h_3NYClf9np1L_54856724760_476d093937_o.jpg?auto=format%2Ccompress&width=828images.prismic.io/openjsf/aS3h_3NYC... https://images.prismic.io/openjsf/aS3h_3NYClf9np1L_54856724760_476d093937_o.jpg?auto=format%2Ccompress&width=828 — 200 — 17.7 KiB — 92 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 — 31 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 — 69 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 — 29.3 KiB — 37 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 — 708 B — 62 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 — 7.1 KiB — 57 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 — 47 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 — 54 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 — 9.5 KiB — 51 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 — 9.9 KiB — 64 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 — 13.2 KiB — 62 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 — 45 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 — 48 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 — 53 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 — 33 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 — 4.1 KiB — 44 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 — 373 B — 56 ms — h2https://openjsf.org/_next/image?url=%2Flogo.svg&w=828&q=75openjsf.org/_next/image?url=%2Flogo... https://openjsf.org/_next/image?url=%2Flogo.svg&w=828&q=75 — 200 — 2.9 KiB — 31 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=1200&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=1200&q=75 — 200 — 3.7 KiB — 45 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=1080&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=1080&q=75 — 200 — 8.9 KiB — 35 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.2 s LCP 4.9 shttps://jquery.org// https://jquery.org/ — 301 — 746 B — 418 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 — 30 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 — 32 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 — 180 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 — 72 ms — h2https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=828images.prismic.io/openjsf/bf362099-... https://images.prismic.io/openjsf/bf362099-eb07-43f6-b38f-d26ce4e09564_49238938753_9f9d300055_o.jpg?auto=compress%2Cformat&width=828 — 200 — 31.5 KiB — 71 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=828images.prismic.io/openjsf/fee76461-... 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h2https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F0456507c-0a32-48f4-a40f-58fff1220f4b_webhintio-ar21.svg&w=256&q=75openjsf.org/_next/image?url=https%3... https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2F0456507c-0a32-48f4-a40f-58fff1220f4b_webhintio-ar21.svg&w=256&q=75 — 200 — 1.6 KiB — 44 ms — h2https://openjsf.org/_next/image?url=https%3A%2F%2Fimages.prismic.io%2Fopenjsf%2Fbf9cf729-cbef-4adb-96f3-3dcb61978853_68747470733a2f2f6431613366347370617a7a7270342e636c6f756466726f6e742e6e65742f6b65706c65722e676c2f776562736974652f69636f6e732f6b65706c65722e676c2d6c6f676f2e706e67.png%3Fauto%3Dcompress%2Cformat&w=750&q=75openjsf.org/_next/image?url=https%3... https://openjsf.org/_next/image?url=https%3A%2F%2Fimages.prismic.io%2Fopenjsf%2Fbf9cf729-cbef-4adb-96f3-3dcb61978853_68747470733a2f2f6431613366347370617a7a7270342e636c6f756466726f6e742e6e65742f6b65706c65722e676c2f776562736974652f69636f6e732f6b65706c65722e676c2d6c6f676f2e706e67.png%3Fauto%3Dcompress%2Cformat&w=750&q=75 — 200 — 3.2 KiB — 42 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 — 348 ms — h2https://openjsf.org/_next/image?url=https%3A%2F%2Fopenjsf.cdn.prismic.io%2Fopenjsf%2Ff29ce81a-3ecf-408a-9919-25643395262a_Sizzle-Logo.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%2Ff29ce81a-3ecf-408a-9919-25643395262a_Sizzle-Logo.svg&w=640&q=75 — 200 — 9.0 KiB — 39 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 1885ms · 273KB · €20/mo
openjsf.org
Other
Costly
Execution 646ms
Transfer 19 KB
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 491ms
Transfer 0 KB
Monthly Cost €5/mo
openjsf.org
Other
Costly
Execution 309ms
Transfer 29 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 281ms
Transfer 171 KB
Unused 41%
Monthly Cost €3/mo
openjsf.org
Other
Optional
Execution 159ms
Transfer 54 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • openjsf.org adds 646ms and costs ~€7/month
  • Unattributable adds 491ms and costs ~€5/month
  • openjsf.org adds 309ms and costs ~€3/month
  • Google Tag Manager adds 281ms and costs ~€3/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 646ms 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

Unattributable takes 491ms 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

openjsf.org takes 309ms 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

Google Tag Manager takes 281ms 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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