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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
!
data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQAB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://assets.medpagetoday.net/media/images/120xx... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23images58 KB
0oversized-0 KB
19legacy format
2missing 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
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
7 fonts (210 KB)
PASS
7 fonts (210 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
210 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
BerninaSans-Web-Bold.woffwoffswap
Size40 KB
Load time6 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
iconset.woffwoffswap
Size6 KB
Load time73 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
lwoff2swap
Size23 KB
Load time29 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
BerninaSans-Web-Regular...woffswap
Size41 KB
Load time9 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
BerninaSans-Web-Light.woffwoffswap
Size38 KB
Load time11 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
lwoff2swap
Size23 KB
Load time18 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
BerninaSans-Web-Semibol...woffswap
Size38 KB
Load time73 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
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 ~49 KB and ~98 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
✓
Page uses 7 resource hint(s)
Current Resource Hints
preconnect
3
preload
2
dns-prefetch
2
prefetch—
7 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
97 requests over 3383ms
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-party6469ms · 1182KB · €103/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
clf1.medpagetoday.net
clf1.medpagetoday.net
Other
2127ms
48 KB
69%
€34/mo
Costly
clf1.medpagetoday.net
clf1.medpagetoday.net
Other
772ms
6 KB
—
€12/mo
Costly
Unattributable
Unattributable
Other
692ms
0 KB
—
€11/mo
Costly
www.medpagetoday.com
www.medpagetoday.com
Other
358ms
33 KB
—
€6/mo
Costly
cdn.p-n.io
cdn.p-n.io
Other
285ms
46 KB
—
€5/mo
Costly
tagan.adlightning.com
tagan.adlightning.com
Other
272ms
184 KB
—
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
270ms
150 KB
38%
€4/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
261ms
188 KB
71%
€4/mo
Costly
micro.rubiconproject.com
micro.rubiconproject.com
Other
261ms
144 KB
49%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
253ms
154 KB
40%
€4/mo
Costly
tagan.adlightning.com
tagan.adlightning.com
Other
196ms
32 KB
75%
€3/mo
Optional
tagan.adlightning.com
tagan.adlightning.com
Other
167ms
9 KB
—
€3/mo
Optional
cdn.static.zdbb.net
cdn.static.zdbb.net
Other
135ms
0 KB
—
€2/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
115ms
97 KB
37%
€2/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
94ms
36 KB
—
€2/mo
Optional
zdstatic.medpagetoday.com
zdstatic.medpagetoday.com
Other
77ms
0 KB
—
€1/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
73ms
34 KB
—
€1/mo
Optional
pub.doubleverify.com
pub.doubleverify.com
Other
60ms
19 KB
—
€1/mo
Optional
clf1.medpagetoday.net
Other
Costly
Execution2127ms
Transfer48 KB
Unused69%
Monthly Cost€34/mo
clf1.medpagetoday.net
Other
Costly
Execution772ms
Transfer6 KB
Monthly Cost€12/mo
Unattributable
Other
Costly
Execution692ms
Transfer0 KB
Monthly Cost€11/mo
www.medpagetoday.com
Other
Costly
Execution358ms
Transfer33 KB
Monthly Cost€6/mo
cdn.p-n.io
Other
Costly
Execution285ms
Transfer46 KB
Monthly Cost€5/mo
tagan.adlightning.com
Other
Costly
Execution272ms
Transfer184 KB
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution270ms
Transfer150 KB
Unused38%
Monthly Cost€4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution261ms
Transfer188 KB
Unused71%
Monthly Cost€4/mo
micro.rubiconproject.com
Other
Costly
Execution261ms
Transfer144 KB
Unused49%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution253ms
Transfer154 KB
Unused40%
Monthly Cost€4/mo
tagan.adlightning.com
Other
Optional
Execution196ms
Transfer32 KB
Unused75%
Monthly Cost€3/mo
tagan.adlightning.com
Other
Optional
Execution167ms
Transfer9 KB
Monthly Cost€3/mo
cdn.static.zdbb.net
Other
Optional
Execution135ms
Transfer0 KB
Monthly Cost€2/mo
Facebook Pixel
Advertising
Optional
Execution115ms
Transfer97 KB
Unused37%
Monthly Cost€2/mo
Facebook Pixel
Advertising
Optional
Execution94ms
Transfer36 KB
Monthly Cost€2/mo
zdstatic.medpagetoday.com
Other
Optional
Execution77ms
Transfer0 KB
Monthly Cost€1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution73ms
Transfer34 KB
Monthly Cost€1/mo
pub.doubleverify.com
Other
Optional
Execution60ms
Transfer19 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
clf1.medpagetoday.net adds 2127ms and costs ~€34/month
clf1.medpagetoday.net adds 772ms and costs ~€12/month
Unattributable adds 692ms and costs ~€11/month
www.medpagetoday.com adds 358ms and costs ~€6/month
cdn.p-n.io adds 285ms and costs ~€5/month
tagan.adlightning.com adds 272ms and costs ~€4/month
Google Tag Manager adds 270ms and costs ~€4/month
securepubads.g.doubleclick.net adds 261ms and costs ~€4/month
micro.rubiconproject.com adds 261ms and costs ~€4/month
Google Tag Manager adds 253ms 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
clf1.medpagetoday.net takes 2127ms 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 clf1.medpagetoday.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
clf1.medpagetoday.net takes 772ms 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 692ms 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.medpagetoday.com takes 358ms 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.p-n.io takes 285ms 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
tagan.adlightning.com takes 272ms 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 270ms 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
securepubads.g.doubleclick.net takes 261ms 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 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
micro.rubiconproject.com takes 261ms 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 253ms 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
75% of tagan.adlightning.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.