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
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Info::
✓
All images are well-optimized
14images1.6 MB
0oversized-0 KB
14legacy 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 (165 KB)
PASS
5 fonts (165 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
165 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
sourcesanspro-regular-w...woff2swap
Size20 KB
Load time20 ms
Start764 ms
RiskFOUT — text flashes from fallback to web font
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time20 ms
Start767 ms
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time30 ms
Start767 ms
RiskFOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5...woff2swap
Size95 KB
Load time29 ms
Start767 ms
RiskFOUT — text flashes from fallback to web font
sourcesanspro-bold-webf...woff2swap
Size20 KB
Load time26 ms
Start768 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+
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
64 requests over 2356ms
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-party8705ms · 2386KB · €95/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Google Tag Manager
www.googletagmanager.com
Tag Manager
849ms
130 KB
46%
€9/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
765ms
147 KB
42%
€8/mo
Costly
jsDelivr
cdn.jsdelivr.net
CDN
744ms
18 KB
—
€8/mo
Costly
Unattributable
Unattributable
Other
736ms
0 KB
—
€8/mo
Costly
www.dol.gov
www.dol.gov
Other
627ms
159 KB
82%
€7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
522ms
156 KB
43%
€6/mo
Costly
www.dol.gov
www.dol.gov
Other
509ms
164 KB
74%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
427ms
152 KB
43%
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
422ms
155 KB
43%
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
419ms
151 KB
43%
€5/mo
Costly
www.dol.gov
www.dol.gov
Other
324ms
257 KB
—
€4/mo
Costly
www.dol.gov
www.dol.gov
Other
321ms
18 KB
—
€3/mo
Costly
dap.digitalgov.gov
dap.digitalgov.gov
Other
314ms
4 KB
—
€3/mo
Costly
www.dol.gov
www.dol.gov
Other
300ms
439 KB
—
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
282ms
126 KB
49%
€3/mo
Costly
Twitter/X Embed
platform.twitter.com
Social
272ms
27 KB
99%
€3/mo
Costly
s.go-mpulse.net
s.go-mpulse.net
Other
188ms
57 KB
66%
€2/mo
Optional
jsDelivr
cdn.jsdelivr.net
CDN
184ms
29 KB
—
€2/mo
Optional
www.dol.gov
www.dol.gov
Other
153ms
5 KB
—
€2/mo
Optional
siteimproveanalytics.com
siteimproveanalytics.com
Other
106ms
15 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
103ms
147 KB
72%
€1/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
86ms
21 KB
—
€1/mo
Optional
dap.digitalgov.gov
dap.digitalgov.gov
Other
54ms
9 KB
—
€1/mo
Optional
Google Tag Manager
Tag Manager
Costly
Execution849ms
Transfer130 KB
Unused46%
Monthly Cost€9/mo
Google Tag Manager
Tag Manager
Costly
Execution765ms
Transfer147 KB
Unused42%
Monthly Cost€8/mo
jsDelivr
CDN
Costly
Execution744ms
Transfer18 KB
Monthly Cost€8/mo
Unattributable
Other
Costly
Execution736ms
Transfer0 KB
Monthly Cost€8/mo
www.dol.gov
Other
Costly
Execution627ms
Transfer159 KB
Unused82%
Monthly Cost€7/mo
Google Tag Manager
Tag Manager
Costly
Execution522ms
Transfer156 KB
Unused43%
Monthly Cost€6/mo
www.dol.gov
Other
Costly
Execution509ms
Transfer164 KB
Unused74%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution427ms
Transfer152 KB
Unused43%
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution422ms
Transfer155 KB
Unused43%
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution419ms
Transfer151 KB
Unused43%
Monthly Cost€5/mo
www.dol.gov
Other
Costly
Execution324ms
Transfer257 KB
Monthly Cost€4/mo
www.dol.gov
Other
Costly
Execution321ms
Transfer18 KB
Monthly Cost€3/mo
dap.digitalgov.gov
Other
Costly
Execution314ms
Transfer4 KB
Monthly Cost€3/mo
www.dol.gov
Other
Costly
Execution300ms
Transfer439 KB
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution282ms
Transfer126 KB
Unused49%
Monthly Cost€3/mo
Twitter/X Embed
Social
Costly
Execution272ms
Transfer27 KB
Unused99%
Monthly Cost€3/mo
s.go-mpulse.net
Other
Optional
Execution188ms
Transfer57 KB
Unused66%
Monthly Cost€2/mo
jsDelivr
CDN
Optional
Execution184ms
Transfer29 KB
Monthly Cost€2/mo
www.dol.gov
Other
Optional
Execution153ms
Transfer5 KB
Monthly Cost€2/mo
siteimproveanalytics.com
Other
Optional
Execution106ms
Transfer15 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution103ms
Transfer147 KB
Unused72%
Monthly Cost€1/mo
Google Analytics
Analytics
Optional
Execution86ms
Transfer21 KB
Monthly Cost€1/mo
dap.digitalgov.gov
Other
Optional
Execution54ms
Transfer9 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
Google Tag Manager adds 849ms and costs ~€9/month
Google Tag Manager adds 765ms and costs ~€8/month
jsDelivr adds 744ms and costs ~€8/month
Unattributable adds 736ms and costs ~€8/month
www.dol.gov adds 627ms and costs ~€7/month
Google Tag Manager adds 522ms and costs ~€6/month
www.dol.gov adds 509ms and costs ~€6/month
Google Tag Manager adds 427ms and costs ~€5/month
Google Tag Manager adds 422ms and costs ~€5/month
Google Tag Manager adds 419ms and costs ~€5/month
www.dol.gov adds 324ms and costs ~€4/month
www.dol.gov adds 321ms and costs ~€3/month
dap.digitalgov.gov adds 314ms and costs ~€3/month
www.dol.gov adds 300ms and costs ~€3/month
Google Tag Manager adds 282ms and costs ~€3/month
Twitter/X Embed adds 272ms 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
Google Tag Manager takes 849ms 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 765ms 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
jsDelivr takes 744ms 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 736ms 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.dol.gov 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
82% of www.dol.gov'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 522ms 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.dol.gov takes 509ms 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
74% of www.dol.gov'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 427ms 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 422ms 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 419ms 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.dol.gov takes 324ms 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.dol.gov takes 321ms 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
dap.digitalgov.gov takes 314ms 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.dol.gov takes 300ms 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 282ms 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
Twitter/X Embed 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
99% of Twitter/X Embed'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
66% of s.go-mpulse.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
72% 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.