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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
2
PASS
9
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.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

676 ms

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

2.16 s

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

11 ms

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

0.001

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

1.22 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.

2.16 s

Page Load Progression

475 ms
951 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.3 s
3.8 s
Checks
15
9 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (769.1 KiB of 796.7 KiB)
Info::
Third-party blocking time is low (0 ms)
97%
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
8 images, 0 KB saveable
REVIEW
8 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.
8 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 Bundles
Action
15 scripts, 179 KB unused
REVIEW
15 scripts, 179 KB unused
Warning::
https://static.jsbin.com/js/prod/jsbin-4.1.8.min.j...: 90 KB unused (37%)
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.
Warning::
https://static.jsbin.com/js/vendor/jshint/jshint.m...: 28 KB unused (19%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 179 KB
179 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.jsbin.com/js/prod/jsbin-4.1.8.min.js244 KB90 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NMYJDX5BRT&cx=c&_slc=1150 KB61 KB (41%)✓3rd
https://static.jsbin.com/js/vendor/jshint/jshint.min.js?4.1.8145 KB28 KB (19%)✓3rd
https://www.google-analytics.com/plugins/ua/linkid.js1 KB—✓3rd
https://jsbin.com/bin/start.js?c55b1 KB—✓1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://static.jsbin.com/js/vendor/jquery-1.11.0.min.js33 KB—✓3rd
https://jsbin.com/manifest.json1 KB—✓1st
https://server.ethicalads.io/api/v1/decision/?publisher=jsbin&ad_types=text-v1&format=jsonp&div_ids=jsbin&callback=jQuery111006791905054127659_1776893136544&_=17768931365451 KB—✓3rd
https://static.jsbin.com/js/vendor/codemirror5/addon/edit/closebrackets.js?4.1.83 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

A
Page Weight Budget
797 KB transferred, 43 requests
PASS
797 KB transferred, 43 requests
Info::
Page weighs 2.3 MB (797 KB transferred)
Warning::
JavaScript is 630 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 630 KB
Info::
43 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
797 KB / 2.4 MB budget
797 KB transferred
43 requests
0.16 g CO2 per page load
JavaScript 630.5 KiB 79%
CSS 66.6 KiB 8%
Other 35.5 KiB 4%
Images 32.4 KiB 4%
Fonts 15.3 KiB 2%
HTML 10.2 KiB 1%
Other 4.3 KiB 1%
Other 1.1 KiB 0%
Other 545 B 0%
Other 301 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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
434ms total JS execution
PASS
434ms total JS execution
Info::
https://jsbin.com/bin/start.js?c55b: 195ms CPU time
Info::
Unattributable: 95ms CPU time
Info::
https://jsbin.com/: 89ms CPU time
Info::
https://null.jsbin.com/cdn-cgi/challenge-platform/...: 56ms CPU time
Info::
Third-party scripts: 150ms (35% of total)

Main Thread Breakdown

Script Evaluation 59% Other 17% Style & Layout 12% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://jsbin.com/bin/start.js?c55b195ms152ms0ms1st
Unattributable95ms19ms0ms3rd
https://jsbin.com/89ms12ms1ms1st
https://null.jsbin.com/cdn-cgi/challenge-platform/scripts/jsd/main.js56ms53ms1ms3rd
A+
Font Loading
1 fonts (15 KB)
PASS
1 fonts (15 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

15 KB total

Render-blocking

0

of 1

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 676 ms LCP 2.2 sdata:application/font-woff;base64,d09GRgABAAAAAD0UABEAAAAAbQwAAQABAAAAAAAAAAAAAAAAAAAAAAAAAABHREVGA…font-woff;base64,d09GRg... data:application/font-woff;base64,d09GRgABAAAAAD0UABEAAAAAbQwAAQABAAAAAAAAAAAAAAAAAAAAAAAAAABHREVGA… — 15.3 KiB — 3 ms — font-display: swap
font-woff;base64,d09GRg... woff swap
Size 15 KB
Load time 3 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~5 KB and ~10 ms

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
43 resources · 797 KB · 179 KB savings available
PASS
43 resources · 797 KB · 179 KB savings available
Info::
Within 1MB page-weight target
Got: 797 KB
Info::
~179 KB of savings available
Warning::
35 third-party resources (97% of weight)
Info::
1 resources over 200KB
43 resources · 796.7 KiB · 35 third-party Within 1MB page-weight target
JavaScript 79% · 631.5 KiB
CSS 8% · 66.6 KiB
Other 5% · 36.7 KiB
Image 5% · 36.3 KiB
Font 2% · 15.3 KiB
Document 1% · 10.2 KiB

~178.6 KiB of savings available

Remove unused JavaScript: 178.6 KiB
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
43 requests over 1896ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 676 ms LCP 2.2 shttps://jsbin.com// https://jsbin.com/ — 200 — 8.9 KiB — 156 ms — h3https://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 — 60 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 — 77 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 — 36.5 KiB — 81 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 — 60 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 — 66 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 — 33 ms — h3https://static.jsbin.com/images/favicon.svgstatic.jsbin.com/images/favicon.svg https://static.jsbin.com/images/favicon.svg — 200 — 806 B — 28 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 — 32 ms — h3https://static.jsbin.com/images/popout.pngstatic.jsbin.com/images/popout.png https://static.jsbin.com/images/popout.png — 200 — 686 B — 25 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 — 29 ms — h3https://jsbin.com/bin/user.js?16da8/bin/user.js?16da8 https://jsbin.com/bin/user.js?16da8 — 200 — 1.0 KiB — 415 ms — h3https://static.jsbin.com/js/prod/jsbin-4.1.8.min.jsstatic.jsbin.com/js/prod/jsbin-4.1.... 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h2https://region1.analytics.google.com/g/collect?v=2&tid=G-NMYJDX5BRT&gtm=45je64k0v9126476171za20g&_p=1776893136682&_gaz=1&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=ABAIAGA&are=1&cid=228926176.1776893137&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938465~115938468~117266400~117512542&dl=https%3A%2F%2Fjsbin.com%2F&dt=JS%20Bin%20-%20Collaborative%20JavaScript%20Debugging&sid=1776893136&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=671region1.analytics.google.com/g/coll... 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https://static.jsbin.com/js/vendor/codemirror5/addon/selection/active-line.js?4.1.8 — 200 — 1.4 KiB — 32 ms — h3https://static.jsbin.com/js/vendor/jshint/jshint.min.js?4.1.8static.jsbin.com/js/vendor/jshint/j... https://static.jsbin.com/js/vendor/jshint/jshint.min.js?4.1.8 — 200 — 144.6 KiB — 33 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 676 ms LCP 2.2 shttps://jsbin.com// https://jsbin.com/ — 200 — 8.9 KiB — 156 ms — h3https://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 — 60 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 — 77 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 — 36.5 KiB — 81 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 — 60 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 — 66 ms — 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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
35% of JavaScript execution is third-party
First-party Third-party 150ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 95ms
Transfer 0 KB
Monthly Cost $1/mo
null.jsbin.com
Other
Optional
Execution 56ms
Transfer 0 KB
Monthly Cost $1/mo

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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