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.
C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
!
https://prodimage.images-bn.com/lf?set=key%5Bresol... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://prodimage.images-bn.com/lf?set=key%5Bresol... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://dispatch.barnesandnoble.com/content/dam/cc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.images-bn.com/static/redesign/srcs/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://prodimage.images-bn.com/lf?set=key%5Bresol... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35images2.1 MB
0oversized-0 KB
28legacy format
16missing 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
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
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
8 fonts (270 KB)
PASS
8 fonts (270 KB)
Info::
i
8 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
8
270 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
LatoLatin-Regular.woff2woff2swap
Size44 KB
Load time35 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
LatoLatin-Medium.woff2woff2swap
Size44 KB
Load time40 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
LatoLatin-Semibold.woff2woff2swap
Size45 KB
Load time39 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
poynter_roman_normal.woff2woff2swap
Size26 KB
Load time38 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
poynter_semibold_italic...woff2swap
Size27 KB
Load time12 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
poynter_semibold_normal...woff2swap
Size28 KB
Load time13 ms
Start1.8 s
RiskFOUT — text flashes from fallback to web font
bn-icons.ttfunknownswap
Size21 KB
Load time26 ms
Start1.8 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time80 ms
Start3.8 s
RiskFOUT — 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)
Fixing the unchecked items could save ~6 KB and ~12 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+
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
115 requests over 4265ms
INFO
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-party12635ms · 1419KB · $168/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
js.js-bn.com
js.js-bn.com
Other
3523ms
13 KB
—
$47/mo
Costly
www.barnesandnoble.com
www.barnesandnoble.com
Other
1238ms
48 KB
—
$16/mo
Costly
js.js-bn.com
js.js-bn.com
Other
1085ms
49 KB
47%
$14/mo
Costly
www.barnesandnoble.com
www.barnesandnoble.com
Other
846ms
1 KB
21%
$11/mo
Costly
js.js-bn.com
js.js-bn.com
Other
825ms
144 KB
32%
$11/mo
Costly
Unattributable
Unattributable
Other
799ms
0 KB
—
$11/mo
Costly
www.gstatic.com
www.gstatic.com
Other
791ms
0 KB
49%
$10/mo
Costly
www.barnesandnoble.com
www.barnesandnoble.com
Other
719ms
156 KB
19%
$10/mo
Costly
js.js-bn.com
js.js-bn.com
Other
649ms
48 KB
—
$9/mo
Costly
js.js-bn.com
js.js-bn.com
Other
488ms
29 KB
—
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
400ms
201 KB
41%
$5/mo
Costly
cdn.clarip.com
cdn.clarip.com
Other
345ms
4 KB
—
$5/mo
Costly
prod.accdab.net
prod.accdab.net
Other
313ms
11 KB
—
$4/mo
Costly
js.js-bn.com
js.js-bn.com
Other
147ms
274 KB
73%
$2/mo
Optional
www.barnesandnoble.com
www.barnesandnoble.com
Other
146ms
9 KB
—
$2/mo
Optional
js.js-bn.com
js.js-bn.com
Other
115ms
87 KB
88%
$2/mo
Optional
js.js-bn.com
js.js-bn.com
Other
77ms
27 KB
—
$1/mo
Optional
www.barnesandnoble.com
www.barnesandnoble.com
Other
66ms
6 KB
—
$1/mo
Optional
css.css-bn.com
css.css-bn.com
Other
62ms
310 KB
—
$1/mo
Optional
js.js-bn.com
Other
Costly
Execution3523ms
Transfer13 KB
Monthly Cost$47/mo
www.barnesandnoble.com
Other
Costly
Execution1238ms
Transfer48 KB
Monthly Cost$16/mo
js.js-bn.com
Other
Costly
Execution1085ms
Transfer49 KB
Unused47%
Monthly Cost$14/mo
www.barnesandnoble.com
Other
Costly
Execution846ms
Transfer1 KB
Unused21%
Monthly Cost$11/mo
js.js-bn.com
Other
Costly
Execution825ms
Transfer144 KB
Unused32%
Monthly Cost$11/mo
Unattributable
Other
Costly
Execution799ms
Transfer0 KB
Monthly Cost$11/mo
www.gstatic.com
Other
Costly
Execution791ms
Transfer0 KB
Unused49%
Monthly Cost$10/mo
www.barnesandnoble.com
Other
Costly
Execution719ms
Transfer156 KB
Unused19%
Monthly Cost$10/mo
js.js-bn.com
Other
Costly
Execution649ms
Transfer48 KB
Monthly Cost$9/mo
js.js-bn.com
Other
Costly
Execution488ms
Transfer29 KB
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution400ms
Transfer201 KB
Unused41%
Monthly Cost$5/mo
cdn.clarip.com
Other
Costly
Execution345ms
Transfer4 KB
Monthly Cost$5/mo
prod.accdab.net
Other
Costly
Execution313ms
Transfer11 KB
Monthly Cost$4/mo
js.js-bn.com
Other
Optional
Execution147ms
Transfer274 KB
Unused73%
Monthly Cost$2/mo
www.barnesandnoble.com
Other
Optional
Execution146ms
Transfer9 KB
Monthly Cost$2/mo
js.js-bn.com
Other
Optional
Execution115ms
Transfer87 KB
Unused88%
Monthly Cost$2/mo
js.js-bn.com
Other
Optional
Execution77ms
Transfer27 KB
Monthly Cost$1/mo
www.barnesandnoble.com
Other
Optional
Execution66ms
Transfer6 KB
Monthly Cost$1/mo
css.css-bn.com
Other
Optional
Execution62ms
Transfer310 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
js.js-bn.com adds 3523ms and costs ~$47/month
www.barnesandnoble.com adds 1238ms and costs ~$16/month
js.js-bn.com adds 1085ms and costs ~$14/month
www.barnesandnoble.com adds 846ms and costs ~$11/month
js.js-bn.com adds 825ms and costs ~$11/month
Unattributable adds 799ms and costs ~$11/month
www.gstatic.com adds 791ms and costs ~$10/month
www.barnesandnoble.com adds 719ms and costs ~$10/month
js.js-bn.com adds 649ms and costs ~$9/month
js.js-bn.com adds 488ms and costs ~$6/month
Google Tag Manager adds 400ms and costs ~$5/month
cdn.clarip.com adds 345ms and costs ~$5/month
prod.accdab.net adds 313ms and costs ~$4/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
js.js-bn.com takes 3523ms 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.barnesandnoble.com takes 1238ms 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
js.js-bn.com takes 1085ms 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.barnesandnoble.com takes 846ms 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
js.js-bn.com takes 825ms 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 799ms 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.gstatic.com takes 791ms 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.barnesandnoble.com takes 719ms 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
js.js-bn.com takes 649ms 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
js.js-bn.com takes 488ms 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 400ms 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
cdn.clarip.com takes 345ms 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
prod.accdab.net takes 313ms 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
73% of js.js-bn.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
88% of js.js-bn.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.