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
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
Image Optimization
Action
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
!
https://www.bing.com/th?id=OPN.PE_30A0ADD3-1CC1-4F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_A9D0EBCB-01E4-41... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_5F7CD389-EDD2-47... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_D883CD54-C135-46... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_831DF3C0-48CF-4A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_68B325B7-419F-4B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_82EE5E6C-EDEA-42... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_5060EFC8-46EB-4A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_F9ABE48D-AD10-47... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_88B4B874-BAAE-4A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_D68A651D-75C3-4D... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_E0041B7B-7B16-47... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_568221D8-C525-48... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_DBD4D0B7-FD9B-4D... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_2A042A97-3F2F-4A... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_144D0AB7-FC33-46... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_72FFDDBA-5D26-4F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_5D9316A6-F681-42... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_64240C83-E33C-4D... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.bing.com/th?id=OPN.PE_37F3F95F-13D6-48... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31images459 KB
0oversized-0 KB
25legacy format
20missing dimensionsCLS 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
B
Main HTML Cache-Control
Cache-Control present but without max-age
REVIEW
Cache-Control present but without max-age
Info::
i
Main HTML Cache-Control has no max-age: private
Got: private
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
32 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
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::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
private
Directive
Value
Meaning
private
—
Only browser cache, not CDN/proxy
A
Page Weight Budget
953 KB transferred, 99 requests
PASS
953 KB transferred, 99 requests
Info::
✓
Page weighs 3.5 MB (953 KB transferred)
Info::
i
99 HTTP requests
Info::
i
Estimated 0.20 g CO2 per page load
953 KBtransferred
99 requests
0.20 g CO2 per page load
Images459.4 KiB48%
Other339.9 KiB36%
HTML59.2 KiB6%
JavaScript40.9 KiB4%
Other26.3 KiB3%
CSS16.3 KiB2%
Other11.5 KiB1%
02.4 MB4.9 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
i
2 dns-prefetch redundant with preconnect on same origin
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://r.bing.com, https://r.bing.com. Remove the redundant dns-prefetch entries.
Info::
i
1 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://r.bing.com (preconnect+preconnect+dns-prefetch+dns-prefetch).
Info::
✓
Page uses 5 resource hint(s)
Current Resource Hints
preconnect
2
preload—
dns-prefetch
2
prefetch
1
5 resource hints configured
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://r.bing.com, https://r.bing.com. Remove the redundant dns-prefetch entries.
Why this matters
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://r.bing.com (preconnect+preconnect+dns-prefetch+dns-prefetch).
Why this matters
Performance issues directly impact user engagement and conversion rates.
A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
✓
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
✓
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
✓
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
99 requests over 2751ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
77%of JavaScript execution is third-party
First-party Third-party1648ms · 95KB · $22/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.bing.com
www.bing.com
Other
398ms
55 KB
—
$5/mo
Costly
www.bing.com
www.bing.com
Other
383ms
15 KB
—
$5/mo
Costly
www.bing.com
www.bing.com
Other
370ms
0 KB
—
$5/mo
Costly
www.bing.com
www.bing.com
Other
183ms
0 KB
70%
$2/mo
Optional
www.bing.com
www.bing.com
Other
132ms
0 KB
63%
$2/mo
Optional
www.bing.com
www.bing.com
Other
69ms
0 KB
—
$1/mo
Optional
www.bing.com
www.bing.com
Other
63ms
0 KB
72%
$1/mo
Optional
www.bing.com
www.bing.com
Other
51ms
25 KB
—
$1/mo
Optional
www.bing.com
Other
Costly
Execution398ms
Transfer55 KB
Monthly Cost$5/mo
www.bing.com
Other
Costly
Execution383ms
Transfer15 KB
Monthly Cost$5/mo
www.bing.com
Other
Costly
Execution370ms
Transfer0 KB
Monthly Cost$5/mo
www.bing.com
Other
Optional
Execution183ms
Transfer0 KB
Unused70%
Monthly Cost$2/mo
www.bing.com
Other
Optional
Execution132ms
Transfer0 KB
Unused63%
Monthly Cost$2/mo
www.bing.com
Other
Optional
Execution69ms
Transfer0 KB
Monthly Cost$1/mo
www.bing.com
Other
Optional
Execution63ms
Transfer0 KB
Unused72%
Monthly Cost$1/mo
www.bing.com
Other
Optional
Execution51ms
Transfer25 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.bing.com adds 398ms and costs ~$5/month
www.bing.com adds 383ms and costs ~$5/month
www.bing.com adds 370ms and costs ~$5/month
77% 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
www.bing.com takes 398ms 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
www.bing.com takes 383ms 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
www.bing.com takes 370ms 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
70% of www.bing.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
63% of www.bing.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
72% of www.bing.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
375 ms
750 ms
1.5 s
3.0 s