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https://www.bing.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
5
PASS
9
INFO
2

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

Mobile Desktop
86
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.
73
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.

1.08 s

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

3.77 s

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

100 ms

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

0.100

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

2.04 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.

3.78 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
16
9 PASS 5 REVIEW
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.bing.com/th?id=OPN.TOBP2_62D263A6EB689... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_681248126CE7F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_45C226FDDF57F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_3D674FF33830B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_B79C3BE1C34C3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_7258625195945... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_1DA93A0FB0664... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_00F51FF4D1421... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_2DD60D3E99848... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_3557D8ABE5F44... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_4D07E199A581F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_30AA3F4606421... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/rp/3Q-Qtx1VliX3e9Su_cQ43faPcL... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_47C9C7ED903C0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_91113A5092552... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_58E81655F51C2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_9A1335FDD0D32... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_1E4C08F6BF49A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_C04DF63745F77... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_7DC10ACBDD97F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bing.com/th?id=OPN.TOBP2_70F90EA2F68CE... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 228 KB
0 oversized -0 KB
25 legacy format
21 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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
1632ms total JS execution
REVIEW
1632ms total JS execution
Warning::
https://www.bing.com/: 550ms CPU time
Warning::
Unattributable: 360ms CPU time
Info::
https://www.bing.com/rp/9NwqIQwu95pDvoeGfAyWcixCiJ...: 238ms CPU time
Info::
https://www.bing.com/rp/n23ANye7L3wtUcgKxoGHb7_ezc...: 154ms CPU time
Info::
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuy...: 117ms CPU time
Info::
Third-party scripts: 360ms (22% of total)

Main Thread Breakdown

Other 37% Script Evaluation 36% Style & Layout 13% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.bing.com/550ms75ms14ms1st
Unattributable360ms24ms0ms3rd
https://www.bing.com/rp/9NwqIQwu95pDvoeGfAyWcixCiJ0.br.js238ms155ms6ms1st
https://www.bing.com/rp/n23ANye7L3wtUcgKxoGHb7_ezc4.br.js154ms113ms6ms1st
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuyc.br.js117ms72ms44ms1st
https://www.bing.com/rp/w19dDk2py2mlGW2GYbXdcuuQfy0.br.js91ms56ms31ms1st
https://www.bing.com/rp/LDPtmbi_w4y1oa90D_hi6HqB1QI.br.js72ms37ms6ms1st
https://www.bing.com/rp/mT1cnTkjEhBUTpHXbB8F4UhxFnc.br.js50ms36ms7ms1st
C
JS Bundles
Action
44 scripts, 288 KB unused
REVIEW
44 scripts, 288 KB unused
Warning::
https://www.bing.com/rp/w19dDk2py2mlGW2GYbXdcuuQfy...: 82 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bing.com/rp/w19dDk2py2mlGW2GYbXdcuuQfy...: 82 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuy...: 62 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuy...: 62 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 288 KB
288 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.bing.com/rp/w19dDk2py2mlGW2GYbXdcuuQfy0.br.js133 KB82 KB (62%)✓1st
https://www.bing.com/rp/w19dDk2py2mlGW2GYbXdcuuQfy0.br.js0 KB82 KB (62%)✓1st
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuyc.br.js0 KB62 KB (70%)✓1st
https://www.bing.com/rp/5RUBu5dEYIDzWQtuZRVAHjBjuyc.br.js89 KB62 KB (70%)✓1st
https://www.bing.com/rp/n23ANye7L3wtUcgKxoGHb7_ezc4.br.js0 KB—✓1st
https://www.bing.com/rs/6p/wb/nj/nt6a1ZR520utsLoZmSYgwxdOPgI.js1 KB—✓1st
https://www.bing.com/rp/n23ANye7L3wtUcgKxoGHb7_ezc4.br.js5 KB—✓1st
https://www.bing.com/rp/LDPtmbi_w4y1oa90D_hi6HqB1QI.br.js2 KB—✓1st
https://www.bing.com/rp/hDHPS9j7i--2wTM9ZXk0Xpp6P7E.br.js2 KB—✓1st
https://www.bing.com/rp/ceg5RyFlBgmXLtKgxWyihUDgnrM.br.js3 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

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

B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
A+
Page Weight Budget
651 KB transferred, 95 requests
PASS
651 KB transferred, 95 requests
Info::
Page weighs 2.6 MB (651 KB transferred)
Info::
95 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
651 KB / 2.4 MB budget
651 KB transferred
95 requests
0.13 g CO2 per page load
Other 268.6 KiB 41%
Images 228.1 KiB 35%
HTML 57.7 KiB 9%
JavaScript 48.7 KiB 7%
Other 26.9 KiB 4%
CSS 12.0 KiB 2%
Other 9.0 KiB 1%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (6.2 KiB of 651.0 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
2
prefetch
1

5 resource hints configured

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
Network Waterfall
95 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
22% of JavaScript execution is third-party
First-party Third-party 360ms · 0KB · $5/mo
Unattributable
Other
Costly
Execution 360ms
Transfer 0 KB
Monthly Cost $5/mo

These scripts may cost more than they're worth

  • Unattributable adds 360ms and costs ~$5/month

Unattributable takes 360ms 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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