https://merriam-webster.com/assets/mw/static/time-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/artic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/artic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://merriam-webster.com/assets/mw/images/omni/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42images797 KB
0oversized-0 KB
29legacy format
10missing 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
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
10 fonts (107 KB)
PASS
10 fonts (107 KB)
Info::
i
10 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
10
107 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Playfair-700-Latin.woff2woff2swap
Size19 KB
Load time46 ms
Start73 ms
RiskFOUT — text flashes from fallback to web font
Playfair-700-Italic-Lat...woff2swap
Size19 KB
Load time46 ms
Start73 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-400-Latin.woff2woff2swap
Size9 KB
Load time33 ms
Start74 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-400-Latin-Ext....woff2swap
Size8 KB
Load time43 ms
Start74 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-400-Italic-Lat...woff2swap
Size8 KB
Load time57 ms
Start75 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-400-Italic-Lat...woff2swap
Size10 KB
Load time66 ms
Start75 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-700-Latin.woff2woff2swap
Size9 KB
Load time74 ms
Start76 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-700-Latin-Ext....woff2swap
Size8 KB
Load time59 ms
Start77 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-700-Italic-Lat...woff2swap
Size10 KB
Load time108 ms
Start77 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-700-Italic-Lat...woff2swap
Size8 KB
Load time113 ms
Start78 ms
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)
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
HTTP Caching
max-age=601 (10 minutes)
PASS
max-age=601 (10 minutes)
Info::
✓
Cache-Control header is set
Got: max-age=601
Info::
✓
Effective TTL: 10 minutes (max-age=601)
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
max-age=601
Directive
Value
Meaning
max-age
601
Cache for 10 minutes
Effective TTL: 601 seconds
Network Waterfall
125 requests over 5276ms
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-party2953ms · 1601KB · €16/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.merriam-webster.com
www.merriam-webster.com
Other
557ms
50 KB
—
€3/mo
Costly
Unattributable
Unattributable
Other
373ms
0 KB
—
€2/mo
Costly
cdn.consentmanager.net
cdn.consentmanager.net
Other
319ms
25 KB
—
€2/mo
Costly
cdn.confiant-integrations.net
cdn.confiant-integrations.net
Other
275ms
167 KB
56%
€1/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
241ms
188 KB
69%
€1/mo
Costly
ads.adthrive.com
ads.adthrive.com
Other
230ms
370 KB
42%
€1/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
154ms
169 KB
40%
€1/mo
Optional
c.aps.amazon-adsystem.com
c.aps.amazon-adsystem.com
Other
153ms
78 KB
65%
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
143ms
146 KB
37%
€1/mo
Optional
www.merriam-webster.com
www.merriam-webster.com
Other
132ms
34 KB
76%
€1/mo
Optional
www.merriam-webster.com
www.merriam-webster.com
Other
123ms
59 KB
59%
€1/mo
Optional
ads.adthrive.com
ads.adthrive.com
Other
110ms
35 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
75ms
121 KB
—
€0/mo
Optional
ads.adthrive.com
ads.adthrive.com
Other
67ms
159 KB
79%
€0/mo
Optional
www.merriam-webster.com
Other
Costly
Execution557ms
Transfer50 KB
Monthly Cost€3/mo
Unattributable
Other
Costly
Execution373ms
Transfer0 KB
Monthly Cost€2/mo
cdn.consentmanager.net
Other
Costly
Execution319ms
Transfer25 KB
Monthly Cost€2/mo
cdn.confiant-integrations.net
Other
Costly
Execution275ms
Transfer167 KB
Unused56%
Monthly Cost€1/mo
securepubads.g.doubleclick.net
Other
Costly
Execution241ms
Transfer188 KB
Unused69%
Monthly Cost€1/mo
ads.adthrive.com
Other
Costly
Execution230ms
Transfer370 KB
Unused42%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution154ms
Transfer169 KB
Unused40%
Monthly Cost€1/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution153ms
Transfer78 KB
Unused65%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution143ms
Transfer146 KB
Unused37%
Monthly Cost€1/mo
www.merriam-webster.com
Other
Optional
Execution132ms
Transfer34 KB
Unused76%
Monthly Cost€1/mo
www.merriam-webster.com
Other
Optional
Execution123ms
Transfer59 KB
Unused59%
Monthly Cost€1/mo
ads.adthrive.com
Other
Optional
Execution110ms
Transfer35 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution75ms
Transfer121 KB
Monthly Cost€0/mo
ads.adthrive.com
Other
Optional
Execution67ms
Transfer159 KB
Unused79%
Monthly Cost€0/mo
These scripts may cost more than they're worth
www.merriam-webster.com adds 557ms and costs ~€3/month
Unattributable adds 373ms and costs ~€2/month
cdn.consentmanager.net adds 319ms and costs ~€2/month
cdn.confiant-integrations.net adds 275ms and costs ~€1/month
securepubads.g.doubleclick.net adds 241ms and costs ~€1/month
ads.adthrive.com adds 230ms and costs ~€1/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.merriam-webster.com takes 557ms 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 373ms 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.consentmanager.net takes 319ms 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.confiant-integrations.net takes 275ms 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 cdn.confiant-integrations.net'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
securepubads.g.doubleclick.net takes 241ms 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 securepubads.g.doubleclick.net'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
ads.adthrive.com takes 230ms 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
65% of c.aps.amazon-adsystem.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
76% of www.merriam-webster.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
59% of www.merriam-webster.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
79% of ads.adthrive.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.