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
61 images, 0 KB saveable
REVIEW
61 images, 0 KB saveable
Warning::
!
https://m.media-amazon.com/images/I/41RL6TtNTYL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/4132uRRkvOL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31lK6OjcSoL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/61X1I2cOtXL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31ti9ytNFsL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/41AsopalzfL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/318MfyHyr5L._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31LARqMMFkL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/21MAAP3UwTL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/61rGjX3VlFL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/61Qihss-r6L._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31RWWFJhr2L._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/41mWZE1Wy1L._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/41MxpaZ25wL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31ktQnx9IlL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/21C1pGnqCbL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31ybGxfJp7L._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/41HtNAtX1jL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/31E2VdHMNML._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://m.media-amazon.com/images/I/41AAlp3TqVL._S... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
61images465 KB
0oversized-0 KB
56legacy 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
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
22 fonts (722 KB)
PASS
22 fonts (722 KB)
Info::
i
22 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
22
722 KB total
Render-blocking
0
of 22
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFPk-9IF4FqAqY-.woff2woff2swap
Size17 KB
Load time21 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
font-woff;charset=utf-8...woffswap
Size4 KB
Load time117 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
YixBCot3QJnxh4p.woff2woff2swap
Size92 KB
Load time28 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
pDxWAF1pBB0dzGB.woff2woff2swap
Size17 KB
Load time27 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
Dv1WQ5DdeMS5qP7.woff2woff2swap
Size28 KB
Load time29 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
VjTR4RqBzY0mUYx.woff2woff2swap
Size22 KB
Load time38 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
WOnTLzkiaEccV7F.woff2woff2swap
Size18 KB
Load time31 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
2SazJx$EeTHfhMN.woff2woff2swap
Size18 KB
Load time41 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
ozb5-CLHQWI6Soc.woff2woff2swap
Size29 KB
Load time41 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
KwhNPG8Jz-Vz2X7.woff2woff2swap
Size23 KB
Load time33 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
lZemoC3awOEEzLR.woff2woff2swap
Size41 KB
Load time52 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
NvWNxKhmDbgI1lq.woff2woff2swap
Size42 KB
Load time44 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
1Ep1kWVX5g73xrY.woff2woff2swap
Size41 KB
Load time77 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
pnZF3$c0rgepEUt.woff2woff2swap
Size42 KB
Load time76 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
Wdqa3S7nfGc3Naj.woff2woff2swap
Size41 KB
Load time75 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
-w6hwcDxlefrOYI.woff2woff2swap
Size42 KB
Load time60 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
gyrV-mLs7VcgiFC.woff2woff2swap
Size34 KB
Load time57 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
8AuIu4whVB5EMoJ.woff2woff2swap
Size35 KB
Load time72 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
MexTn601PAhMvAn.woff2woff2swap
Size34 KB
Load time75 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
rlTCFdyUZFR9mQI.woff2woff2swap
Size34 KB
Load time58 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
ukoYNzKrqDRxhTq.woff2woff2swap
Size34 KB
Load time74 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
1yLvxs7jafx7AW$.woff2woff2swap
Size35 KB
Load time73 ms
Start2.2 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 ~1 KB and ~2 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
154 requests over 4881ms
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-party5373ms · 1263KB · CA$74/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.amazon.ca
www.amazon.ca
Other
1693ms
402 KB
—
CA$23/mo
Costly
m.media-amazon.com
m.media-amazon.com
Other
1215ms
142 KB
71%
CA$17/mo
Costly
Unattributable
Unattributable
Other
760ms
0 KB
—
CA$11/mo
Costly
1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.com
1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.com
Other
723ms
501 KB
56%
CA$10/mo
Costly
m.media-amazon.com
m.media-amazon.com
Other
311ms
95 KB
69%
CA$4/mo
Costly
m.media-amazon.com
m.media-amazon.com
Other
140ms
21 KB
—
CA$2/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
121ms
7 KB
—
CA$2/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
101ms
59 KB
61%
CA$1/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
90ms
30 KB
—
CA$1/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
90ms
3 KB
—
CA$1/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
64ms
1 KB
—
CA$1/mo
Optional
m.media-amazon.com
m.media-amazon.com
Other
64ms
2 KB
—
CA$1/mo
Optional
www.amazon.ca
Other
Costly
Execution1693ms
Transfer402 KB
Monthly CostCA$23/mo
m.media-amazon.com
Other
Costly
Execution1215ms
Transfer142 KB
Unused71%
Monthly CostCA$17/mo
Unattributable
Other
Costly
Execution760ms
Transfer0 KB
Monthly CostCA$11/mo
1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.com
Other
Costly
Execution723ms
Transfer501 KB
Unused56%
Monthly CostCA$10/mo
m.media-amazon.com
Other
Costly
Execution311ms
Transfer95 KB
Unused69%
Monthly CostCA$4/mo
m.media-amazon.com
Other
Optional
Execution140ms
Transfer21 KB
Monthly CostCA$2/mo
m.media-amazon.com
Other
Optional
Execution121ms
Transfer7 KB
Monthly CostCA$2/mo
m.media-amazon.com
Other
Optional
Execution101ms
Transfer59 KB
Unused61%
Monthly CostCA$1/mo
m.media-amazon.com
Other
Optional
Execution90ms
Transfer30 KB
Monthly CostCA$1/mo
m.media-amazon.com
Other
Optional
Execution90ms
Transfer3 KB
Monthly CostCA$1/mo
m.media-amazon.com
Other
Optional
Execution64ms
Transfer1 KB
Monthly CostCA$1/mo
m.media-amazon.com
Other
Optional
Execution64ms
Transfer2 KB
Monthly CostCA$1/mo
These scripts may cost more than they're worth
www.amazon.ca adds 1693ms and costs ~CA$23/month
m.media-amazon.com adds 1215ms and costs ~CA$17/month
Unattributable adds 760ms and costs ~CA$11/month
1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.com adds 723ms and costs ~CA$10/month
m.media-amazon.com adds 311ms and costs ~CA$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
www.amazon.ca takes 1693ms 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
m.media-amazon.com takes 1215ms 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
71% of m.media-amazon.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
Unattributable takes 760ms 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
1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.com takes 723ms 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
56% of 1c5c1ecf7303.742a0c6e.eu-west-3.token.awswaf.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
m.media-amazon.com takes 311ms 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
69% of m.media-amazon.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
61% of m.media-amazon.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.