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
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
!
https://www.newyorkfed.org/medialibrary/media/foot... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.newyorkfed.org/medialibrary/media/v4/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32images5.7 MB
0oversized-0 KB
32legacy 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
2 fonts (49 KB)
PASS
2 fonts (49 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
49 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
robotocondensed-regular...woffswap
Size25 KB
Load time400 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
robotocondensed-bold-we...woffswap
Size25 KB
Load time399 ms
Start1.5 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 ~15 KB and ~30 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
71 requests over 4077ms
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-party2828ms · 740KB · €31/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
691ms
0 KB
—
€8/mo
Costly
s.go-mpulse.net
s.go-mpulse.net
Other
683ms
60 KB
44%
€7/mo
Costly
www.newyorkfed.org
www.newyorkfed.org
Other
512ms
0 KB
21%
€6/mo
Costly
www.newyorkfed.org
www.newyorkfed.org
Other
313ms
19 KB
—
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
142ms
155 KB
41%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
131ms
131 KB
54%
€1/mo
Optional
www.newyorkfed.org
www.newyorkfed.org
Other
96ms
115 KB
73%
€1/mo
Optional
www.newyorkfed.org
www.newyorkfed.org
Other
75ms
39 KB
69%
€1/mo
Optional
siteimproveanalytics.com
siteimproveanalytics.com
Other
71ms
19 KB
—
€1/mo
Optional
www.newyorkfed.org
www.newyorkfed.org
Other
59ms
112 KB
61%
€1/mo
Optional
www.newyorkfed.org
www.newyorkfed.org
Other
55ms
90 KB
89%
€1/mo
Optional
Unattributable
Other
Costly
Execution691ms
Transfer0 KB
Monthly Cost€8/mo
s.go-mpulse.net
Other
Costly
Execution683ms
Transfer60 KB
Unused44%
Monthly Cost€7/mo
www.newyorkfed.org
Other
Costly
Execution512ms
Transfer0 KB
Unused21%
Monthly Cost€6/mo
www.newyorkfed.org
Other
Costly
Execution313ms
Transfer19 KB
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Optional
Execution142ms
Transfer155 KB
Unused41%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution131ms
Transfer131 KB
Unused54%
Monthly Cost€1/mo
www.newyorkfed.org
Other
Optional
Execution96ms
Transfer115 KB
Unused73%
Monthly Cost€1/mo
www.newyorkfed.org
Other
Optional
Execution75ms
Transfer39 KB
Unused69%
Monthly Cost€1/mo
siteimproveanalytics.com
Other
Optional
Execution71ms
Transfer19 KB
Monthly Cost€1/mo
www.newyorkfed.org
Other
Optional
Execution59ms
Transfer112 KB
Unused61%
Monthly Cost€1/mo
www.newyorkfed.org
Other
Optional
Execution55ms
Transfer90 KB
Unused89%
Monthly Cost€1/mo
These scripts may cost more than they're worth
Unattributable adds 691ms and costs ~€8/month
s.go-mpulse.net adds 683ms and costs ~€7/month
www.newyorkfed.org adds 512ms and costs ~€6/month
www.newyorkfed.org adds 313ms 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
Unattributable takes 691ms 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
s.go-mpulse.net takes 683ms 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.newyorkfed.org takes 512ms 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.newyorkfed.org takes 313ms 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
54% of Google Tag Manager'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
73% of www.newyorkfed.org'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
69% of www.newyorkfed.org'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 www.newyorkfed.org'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
89% of www.newyorkfed.org'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.