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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

3.30 s

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

6.55 s

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

352 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.

4.13 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.

7.06 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
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (607.1 KiB of 634.1 KiB)
Info::
Third-party blocking time is low (0 ms)
96%
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
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Warning::
https://static.jsbin.com/images/dave.min.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 32 KB
0 oversized -0 KB
7 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
1675ms total JS execution
REVIEW
1675ms total JS execution
Warning::
https://jsbin.com/bin/start.js?1520c: 379ms CPU time
Warning::
Unattributable: 326ms CPU time
Info::
https://jsbin.com/cdn-cgi/challenge-platform/scrip...: 206ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-NMYJ...: 181ms CPU time
Info::
https://null.jsbin.com/cdn-cgi/challenge-platform/...: 163ms CPU time
Warning::
Third-party scripts: 952ms (57% of total)

Main Thread Breakdown

Script Evaluation 60% Other 20% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://jsbin.com/bin/start.js?1520c379ms332ms0ms1st
Unattributable326ms67ms0ms3rd
https://jsbin.com/cdn-cgi/challenge-platform/scripts/jsd/main.js206ms181ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-NMYJDX5BRT&cx=c&_slc=1181ms132ms37ms3rd
https://null.jsbin.com/cdn-cgi/challenge-platform/scripts/jsd/main.js163ms154ms3ms3rd
https://jsbin.com/137ms39ms4ms1st
https://static.jsbin.com/js/prod/jsbin-4.1.8.min.js120ms19ms95ms3rd
https://www.google-analytics.com/analytics.js103ms39ms4ms3rd
https://static.jsbin.com/js/vendor/jquery-1.11.0.min.js59ms40ms7ms3rd
C
JS Bundles
Action
12 scripts, 173 KB unused
REVIEW
12 scripts, 173 KB unused
Warning::
https://static.jsbin.com/js/prod/jsbin-4.1.8.min.j...: 112 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NMYJ...: 61 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 173 KB
173 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.jsbin.com/js/prod/jsbin-4.1.8.min.js244 KB112 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NMYJDX5BRT&cx=c&_slc=1150 KB61 KB (41%)✓3rd
https://static.jsbin.com/js/vendor/jquery-1.11.0.min.js33 KB—✓3rd
https://jsbin.com/bin/user.js?181d31 KB—✓1st
https://jsbin.com/manifest.json1 KB—✓1st
https://jsbin.com/bin/start.js?1520c1 KB—✓1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://www.google-analytics.com/plugins/ua/linkid.js1 KB—✓3rd
https://server.ethicalads.io/api/v1/decision/?publisher=jsbin&ad_types=text-v1&format=jsonp&div_ids=jsbin&callback=jQuery11100544814573025354_1776893121591&_=17768931215921 KB—✓3rd
https://jsbin.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓1st

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

A+
Page Weight Budget
634 KB transferred, 38 requests
PASS
634 KB transferred, 38 requests
Info::
Page weighs 1.9 MB (634 KB transferred)
Info::
38 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
634 KB / 2.4 MB budget
634 KB transferred
38 requests
0.13 g CO2 per page load
JavaScript 483.6 KiB 76%
CSS 66.6 KiB 11%
Other 35.1 KiB 6%
Images 32.4 KiB 5%
HTML 10.2 KiB 2%
Other 4.4 KiB 1%
Other 1.0 KiB 0%
Other 545 B 0%
Other 301 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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
38 resources · 634 KB · 173 KB savings available
PASS
38 resources · 634 KB · 173 KB savings available
Info::
Within 1MB page-weight target
Got: 634 KB
Info::
~173 KB of savings available
Warning::
30 third-party resources (96% of weight)
Info::
1 resources over 200KB
38 resources · 634.1 KiB · 30 third-party Within 1MB page-weight target
JavaScript 76% · 484.7 KiB
CSS 11% · 66.6 KiB
Other 6% · 36.4 KiB
Image 6% · 36.3 KiB
Document 2% · 10.2 KiB

~172.7 KiB of savings available

Remove unused JavaScript: 172.7 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
38 requests over 2349ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 6.5 shttps://jsbin.com// https://jsbin.com/ — 200 — 8.9 KiB — 178 ms — h2https://static.jsbin.com/js/vendor/codemirror5/lib/codemirror.css?4.1.8static.jsbin.com/js/vendor/codemirr... https://static.jsbin.com/js/vendor/codemirror5/lib/codemirror.css?4.1.8 — 200 — 3.0 KiB — 128 ms — h3https://static.jsbin.com/css/style.css?4.1.8static.jsbin.com/css/style.css?4.1.... https://static.jsbin.com/css/style.css?4.1.8 — 200 — 20.4 KiB — 154 ms — h3https://static.jsbin.com/css/themes.css?4.1.8static.jsbin.com/css/themes.css?4.1... https://static.jsbin.com/css/themes.css?4.1.8 — 200 — 36.6 KiB — 156 ms — h3https://static.jsbin.com/css/mobile.css?4.1.8static.jsbin.com/css/mobile.css?4.1... https://static.jsbin.com/css/mobile.css?4.1.8 — 200 — 3.0 KiB — 130 ms — h3https://static.jsbin.com/css/font.css?4.1.8static.jsbin.com/css/font.css?4.1.8 https://static.jsbin.com/css/font.css?4.1.8 — 200 — 3.7 KiB — 133 ms — h3https://static.jsbin.com/images/dave.min.svgstatic.jsbin.com/images/dave.min.sv... https://static.jsbin.com/images/dave.min.svg — 200 — 3.1 KiB — 130 ms — h3https://static.jsbin.com/images/favicon.svgstatic.jsbin.com/images/favicon.svg https://static.jsbin.com/images/favicon.svg — 200 — 812 B — 27 ms — h3https://static.jsbin.com/images/github-32.pngstatic.jsbin.com/images/github-32.p... https://static.jsbin.com/images/github-32.png — 200 — 2.2 KiB — 25 ms — h3https://static.jsbin.com/images/popout.pngstatic.jsbin.com/images/popout.png https://static.jsbin.com/images/popout.png — 200 — 694 B — 27 ms — h3https://static.jsbin.com/js/vendor/jquery-1.11.0.min.jsstatic.jsbin.com/js/vendor/jquery-1... https://static.jsbin.com/js/vendor/jquery-1.11.0.min.js — 200 — 33.4 KiB — 33 ms — h3https://jsbin.com/bin/user.js?181d3/bin/user.js?181d3 https://jsbin.com/bin/user.js?181d3 — 200 — 854 B — 438 ms — h2https://static.jsbin.com/js/prod/jsbin-4.1.8.min.jsstatic.jsbin.com/js/prod/jsbin-4.1.... https://static.jsbin.com/js/prod/jsbin-4.1.8.min.js — 200 — 244.0 KiB — 63 ms — h3https://jsbin.com/manifest.json/manifest.json https://jsbin.com/manifest.json — 200 — 1.0 KiB — 158 ms — h3https://jsbin.com/bin/start.js?1520c/bin/start.js?1520c https://jsbin.com/bin/start.js?1520c — 200 — 743 B — 443 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 139 ms — h2https://www.google-analytics.com/plugins/ua/linkid.jswww.google-analytics.com/plugins/ua... https://www.google-analytics.com/plugins/ua/linkid.js — 200 — 995 B — 31 ms — h2https://static.jsbin.com/images/jsbin_animated.gifstatic.jsbin.com/images/jsbin_anima... https://static.jsbin.com/images/jsbin_animated.gif — 200 — 24.8 KiB — 29 ms — 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h3https://jsbin.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://jsbin.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 11.7 KiB — 35 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 6.5 shttps://jsbin.com// https://jsbin.com/ — 200 — 8.9 KiB — 178 ms — h2https://static.jsbin.com/js/vendor/codemirror5/lib/codemirror.css?4.1.8static.jsbin.com/js/vendor/codemirr... https://static.jsbin.com/js/vendor/codemirror5/lib/codemirror.css?4.1.8 — 200 — 3.0 KiB — 128 ms — h3https://static.jsbin.com/css/style.css?4.1.8static.jsbin.com/css/style.css?4.1.... https://static.jsbin.com/css/style.css?4.1.8 — 200 — 20.4 KiB — 154 ms — h3https://static.jsbin.com/css/themes.css?4.1.8static.jsbin.com/css/themes.css?4.1... https://static.jsbin.com/css/themes.css?4.1.8 — 200 — 36.6 KiB — 156 ms — h3https://static.jsbin.com/css/mobile.css?4.1.8static.jsbin.com/css/mobile.css?4.1... https://static.jsbin.com/css/mobile.css?4.1.8 — 200 — 3.0 KiB — 130 ms — h3https://static.jsbin.com/css/font.css?4.1.8static.jsbin.com/css/font.css?4.1.8 https://static.jsbin.com/css/font.css?4.1.8 — 200 — 3.7 KiB — 133 ms — h3https://static.jsbin.com/images/dave.min.svgstatic.jsbin.com/images/dave.min.sv... https://static.jsbin.com/images/dave.min.svg — 200 — 3.1 KiB — 130 ms — h3https://static.jsbin.com/images/favicon.svgstatic.jsbin.com/images/favicon.svg https://static.jsbin.com/images/favicon.svg — 200 — 812 B — 27 ms — h3https://static.jsbin.com/images/github-32.pngstatic.jsbin.com/images/github-32.p... https://static.jsbin.com/images/github-32.png — 200 — 2.2 KiB — 25 ms — h3https://static.jsbin.com/images/popout.pngstatic.jsbin.com/images/popout.png https://static.jsbin.com/images/popout.png — 200 — 694 B — 27 ms — h3https://static.jsbin.com/js/vendor/jquery-1.11.0.min.jsstatic.jsbin.com/js/vendor/jquery-1... https://static.jsbin.com/js/vendor/jquery-1.11.0.min.js — 200 — 33.4 KiB — 33 ms — h3https://jsbin.com/bin/user.js?181d3/bin/user.js?181d3 https://jsbin.com/bin/user.js?181d3 — 200 — 854 B — 438 ms — h2https://static.jsbin.com/js/prod/jsbin-4.1.8.min.jsstatic.jsbin.com/js/prod/jsbin-4.1.... 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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
57% of JavaScript execution is third-party
First-party Third-party 952ms · 449KB · $13/mo
Unattributable
Other
Costly
Execution 326ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 181ms
Transfer 150 KB
Unused 41%
Monthly Cost $2/mo
null.jsbin.com
Other
Optional
Execution 163ms
Transfer 0 KB
Monthly Cost $2/mo
static.jsbin.com
Other
Optional
Execution 120ms
Transfer 244 KB
Unused 46%
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 103ms
Transfer 21 KB
Monthly Cost $1/mo
static.jsbin.com
Other
Optional
Execution 59ms
Transfer 33 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 326ms and costs ~$4/month

57% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 326ms 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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