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.
B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
✓
All images are well-optimized
44images777 KB
0oversized-0 KB
8legacy format
0missing dimensionsCLS risk
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
5 fonts (155 KB)
PASS
5 fonts (155 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
155 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
32A982_7_0.woff2woff2swap
Size35 KB
Load time120 ms
Start277 ms
RiskFOUT — text flashes from fallback to web font
32A982_9_0.woff2woff2swap
Size34 KB
Load time117 ms
Start278 ms
RiskFOUT — text flashes from fallback to web font
38C507_0_0.woff2woff2swap
Size41 KB
Load time123 ms
Start278 ms
RiskFOUT — text flashes from fallback to web font
32A982_1_0.woff2woff2swap
Size35 KB
Load time9 ms
Start542 ms
RiskFOUT — text flashes from fallback to web font
healthline.woffwoffswap
Size10 KB
Load time65 ms
Start1.3 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 ~3 KB and ~6 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
19 hints, 0 missing preconnects
PASS
19 hints, 0 missing preconnects
Info::
✓
Page uses 19 resource hint(s)
Current Resource Hints
preconnect
2
preload
+7
17
dns-prefetch—
prefetch—
19 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
156 requests over 4665ms
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-party10441ms · 2426KB · €113/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.healthline.com
www.healthline.com
Other
1877ms
76 KB
—
€20/mo
Costly
Unattributable
Unattributable
Other
1830ms
0 KB
—
€20/mo
Costly
rvo-cohesion.healthline.com
rvo-cohesion.healthline.com
Other
1518ms
29 KB
—
€16/mo
Costly
prod.adspsp.com
prod.adspsp.com
Other
627ms
75 KB
44%
€7/mo
Costly
cdn.confiant-integrations.net
cdn.confiant-integrations.net
Other
551ms
142 KB
62%
€6/mo
Costly
gtm-server.healthline.com
gtm-server.healthline.com
Other
476ms
210 KB
39%
€5/mo
Costly
prod.adspsp.com
prod.adspsp.com
Other
385ms
160 KB
69%
€4/mo
Costly
assets.healthline.com
assets.healthline.com
Other
375ms
171 KB
56%
€4/mo
Costly
gtm-server.healthline.com
gtm-server.healthline.com
Other
373ms
164 KB
44%
€4/mo
Costly
assets.healthline.com
assets.healthline.com
Other
357ms
251 KB
72%
€4/mo
Costly
client.aps.amazon-adsystem.com
client.aps.amazon-adsystem.com
Other
284ms
83 KB
56%
€3/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
257ms
188 KB
75%
€3/mo
Costly
ats-wrapper.privacymanager.io
ats-wrapper.privacymanager.io
Other
198ms
75 KB
50%
€2/mo
Optional
assets.healthline.com
assets.healthline.com
Other
194ms
14 KB
—
€2/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
190ms
9 KB
—
€2/mo
Essential
assets.healthline.com
assets.healthline.com
Other
128ms
400 KB
82%
€1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
117ms
128 KB
65%
€1/mo
Essential
pub.doubleverify.com
pub.doubleverify.com
Other
109ms
31 KB
—
€1/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
102ms
34 KB
—
€1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
94ms
2 KB
—
€1/mo
Essential
cdn.id5-sync.com
cdn.id5-sync.com
Other
91ms
34 KB
—
€1/mo
Optional
assets.healthline.com
assets.healthline.com
Other
68ms
4 KB
—
€1/mo
Optional
secure.cdn.fastclick.net
secure.cdn.fastclick.net
Other
65ms
22 KB
—
€1/mo
Optional
cdn.confiant-integrations.net
cdn.confiant-integrations.net
Other
61ms
66 KB
—
€1/mo
Optional
cdn-ima.33across.com
cdn-ima.33across.com
Other
60ms
7 KB
—
€1/mo
Optional
cdn.btmessage.com
cdn.btmessage.com
Other
52ms
51 KB
60%
€1/mo
Optional
www.healthline.com
Other
Costly
Execution1877ms
Transfer76 KB
Monthly Cost€20/mo
Unattributable
Other
Costly
Execution1830ms
Transfer0 KB
Monthly Cost€20/mo
rvo-cohesion.healthline.com
Other
Costly
Execution1518ms
Transfer29 KB
Monthly Cost€16/mo
prod.adspsp.com
Other
Costly
Execution627ms
Transfer75 KB
Unused44%
Monthly Cost€7/mo
cdn.confiant-integrations.net
Other
Costly
Execution551ms
Transfer142 KB
Unused62%
Monthly Cost€6/mo
gtm-server.healthline.com
Other
Costly
Execution476ms
Transfer210 KB
Unused39%
Monthly Cost€5/mo
prod.adspsp.com
Other
Costly
Execution385ms
Transfer160 KB
Unused69%
Monthly Cost€4/mo
assets.healthline.com
Other
Costly
Execution375ms
Transfer171 KB
Unused56%
Monthly Cost€4/mo
gtm-server.healthline.com
Other
Costly
Execution373ms
Transfer164 KB
Unused44%
Monthly Cost€4/mo
assets.healthline.com
Other
Costly
Execution357ms
Transfer251 KB
Unused72%
Monthly Cost€4/mo
client.aps.amazon-adsystem.com
Other
Costly
Execution284ms
Transfer83 KB
Unused56%
Monthly Cost€3/mo
securepubads.g.doubleclick.net
Other
Costly
Execution257ms
Transfer188 KB
Unused75%
Monthly Cost€3/mo
ats-wrapper.privacymanager.io
Other
Optional
Execution198ms
Transfer75 KB
Unused50%
Monthly Cost€2/mo
assets.healthline.com
Other
Optional
Execution194ms
Transfer14 KB
Monthly Cost€2/mo
OneTrust
Consent
Essential
Execution190ms
Transfer9 KB
Monthly Cost€2/mo
assets.healthline.com
Other
Optional
Execution128ms
Transfer400 KB
Unused82%
Monthly Cost€1/mo
OneTrust
Consent
Essential
Execution117ms
Transfer128 KB
Unused65%
Monthly Cost€1/mo
pub.doubleverify.com
Other
Optional
Execution109ms
Transfer31 KB
Monthly Cost€1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution102ms
Transfer34 KB
Monthly Cost€1/mo
OneTrust
Consent
Essential
Execution94ms
Transfer2 KB
Monthly Cost€1/mo
cdn.id5-sync.com
Other
Optional
Execution91ms
Transfer34 KB
Monthly Cost€1/mo
assets.healthline.com
Other
Optional
Execution68ms
Transfer4 KB
Monthly Cost€1/mo
secure.cdn.fastclick.net
Other
Optional
Execution65ms
Transfer22 KB
Monthly Cost€1/mo
cdn.confiant-integrations.net
Other
Optional
Execution61ms
Transfer66 KB
Monthly Cost€1/mo
cdn-ima.33across.com
Other
Optional
Execution60ms
Transfer7 KB
Monthly Cost€1/mo
cdn.btmessage.com
Other
Optional
Execution52ms
Transfer51 KB
Unused60%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.healthline.com adds 1877ms and costs ~€20/month
Unattributable adds 1830ms and costs ~€20/month
rvo-cohesion.healthline.com adds 1518ms and costs ~€16/month
prod.adspsp.com adds 627ms and costs ~€7/month
cdn.confiant-integrations.net adds 551ms and costs ~€6/month
gtm-server.healthline.com adds 476ms and costs ~€5/month
prod.adspsp.com adds 385ms and costs ~€4/month
assets.healthline.com adds 375ms and costs ~€4/month
gtm-server.healthline.com adds 373ms and costs ~€4/month
assets.healthline.com adds 357ms and costs ~€4/month
client.aps.amazon-adsystem.com adds 284ms and costs ~€3/month
securepubads.g.doubleclick.net adds 257ms and costs ~€3/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.healthline.com takes 1877ms 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 1830ms 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
rvo-cohesion.healthline.com takes 1518ms 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.adspsp.com takes 627ms 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 551ms 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
62% 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
gtm-server.healthline.com takes 476ms 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.adspsp.com takes 385ms 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 prod.adspsp.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
assets.healthline.com takes 375ms 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 assets.healthline.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
gtm-server.healthline.com 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
assets.healthline.com takes 357ms 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
72% of assets.healthline.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
client.aps.amazon-adsystem.com takes 284ms 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 client.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
securepubads.g.doubleclick.net takes 257ms 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 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
82% of assets.healthline.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
65% of OneTrust'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
60% of cdn.btmessage.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.