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
Page Weight Budget
Action
1.6 MB transferred, 55 requests
REVIEW
1.6 MB transferred, 55 requests
Info::
i
Page weighs 4.0 MB (1.6 MB transferred)
Warning::
!
JavaScript is 842 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 842 KB
Info::
i
55 HTTP requests
Info::
i
Estimated 0.33 g CO2 per page load
1.6 MBtransferred
55 requests
0.33 g CO2 per page load
JavaScript841.7 KiB52%
Images559.2 KiB35%
Other100.3 KiB6%
Fonts53.9 KiB3%
CSS49.2 KiB3%
HTML12.6 KiB1%
Other874 B0%
Other570 B0%
Other559 B0%
Other196 B0%
02.4 MB4.9 MB
Approaching limit
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Why this matters
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
B
Image Optimization
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
✓
All images are well-optimized
25images559 KB
0oversized-0 KB
24legacy 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
2 fonts (54 KB)
PASS
2 fonts (54 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
54 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fontello.woff2woff2swap
Size12 KB
Load time14 ms
Start502 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time10 ms
Start1.4 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)
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
55 requests over 2185ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
74%of JavaScript execution is third-party
First-party Third-party3907ms · 802KB · $52/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
fundingchoicesmessages.google.com
fundingchoicesmessages.google.com
Other
643ms
75 KB
—
$9/mo
Costly
Unattributable
Unattributable
Other
637ms
0 KB
—
$8/mo
Costly
fundingchoicesmessages.google.com
fundingchoicesmessages.google.com
Other
515ms
72 KB
51%
$7/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
456ms
187 KB
70%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
436ms
170 KB
40%
$6/mo
Costly
medx.b-cdn.net
medx.b-cdn.net
Other
398ms
8 KB
—
$5/mo
Costly
pagead2.googlesyndication.com
pagead2.googlesyndication.com
Other
368ms
54 KB
51%
$5/mo
Costly
pagead2.googlesyndication.com
pagead2.googlesyndication.com
Other
263ms
178 KB
84%
$3/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
121ms
34 KB
—
$2/mo
Optional
medx.b-cdn.net
medx.b-cdn.net
Other
70ms
24 KB
—
$1/mo
Optional
fundingchoicesmessages.google.com
Other
Costly
Execution643ms
Transfer75 KB
Monthly Cost$9/mo
Unattributable
Other
Costly
Execution637ms
Transfer0 KB
Monthly Cost$8/mo
fundingchoicesmessages.google.com
Other
Costly
Execution515ms
Transfer72 KB
Unused51%
Monthly Cost$7/mo
securepubads.g.doubleclick.net
Other
Costly
Execution456ms
Transfer187 KB
Unused70%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution436ms
Transfer170 KB
Unused40%
Monthly Cost$6/mo
medx.b-cdn.net
Other
Costly
Execution398ms
Transfer8 KB
Monthly Cost$5/mo
pagead2.googlesyndication.com
Other
Costly
Execution368ms
Transfer54 KB
Unused51%
Monthly Cost$5/mo
pagead2.googlesyndication.com
Other
Costly
Execution263ms
Transfer178 KB
Unused84%
Monthly Cost$3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution121ms
Transfer34 KB
Monthly Cost$2/mo
medx.b-cdn.net
Other
Optional
Execution70ms
Transfer24 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
fundingchoicesmessages.google.com adds 643ms and costs ~$9/month
Unattributable adds 637ms and costs ~$8/month
fundingchoicesmessages.google.com adds 515ms and costs ~$7/month
securepubads.g.doubleclick.net adds 456ms and costs ~$6/month
Google Tag Manager adds 436ms and costs ~$6/month
medx.b-cdn.net adds 398ms and costs ~$5/month
pagead2.googlesyndication.com adds 368ms and costs ~$5/month
pagead2.googlesyndication.com adds 263ms and costs ~$3/month
74% 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
fundingchoicesmessages.google.com takes 643ms 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 637ms 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
fundingchoicesmessages.google.com takes 515ms 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
51% of fundingchoicesmessages.google.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 456ms 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
70% 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
Google Tag Manager takes 436ms 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
medx.b-cdn.net takes 398ms 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
pagead2.googlesyndication.com takes 368ms 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
51% of pagead2.googlesyndication.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
pagead2.googlesyndication.com takes 263ms 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
84% of pagead2.googlesyndication.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.