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, 78 requests
REVIEW
1.6 MB transferred, 78 requests
Info::
i
Page weighs 4.6 MB (1.6 MB transferred)
Warning::
!
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
i
78 HTTP requests
Info::
i
Estimated 0.35 g CO2 per page load
1.6 MBtransferred
78 requests
0.35 g CO2 per page load
JavaScript1.1 MiB66%
Images295.7 KiB18%
Fonts194.9 KiB12%
HTML38.2 KiB2%
CSS35.1 KiB2%
Other13.3 KiB1%
Other1.6 KiB0%
Other468 B0%
Other125 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
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Info::
✓
All images are well-optimized
18images296 KB
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
3 fonts (195 KB)
PASS
3 fonts (195 KB)
Info::
i
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
195 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Roboto-Light.woff2woff2swap
Size64 KB
Load time438 ms
Start925 ms
RiskFOUT — text flashes from fallback to web font
Roboto-Medium.woff2woff2swap
Size66 KB
Load time557 ms
Start925 ms
RiskFOUT — text flashes from fallback to web font
Roboto-Regular.woff2woff2swap
Size65 KB
Load time560 ms
Start925 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
✓
Page uses 4 resource hint(s)
Current Resource Hints
preconnect
1
preload
3
dns-prefetch—
prefetch—
4 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
78 requests over 4111ms
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-party4883ms · 821KB · €26/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
atlas.hostnet.nl
atlas.hostnet.nl
Other
1392ms
25 KB
—
€7/mo
Costly
www.hostnet.nl
www.hostnet.nl
Other
1045ms
31 KB
—
€6/mo
Costly
Unattributable
Unattributable
Other
589ms
0 KB
—
€3/mo
Costly
atlas.hostnet.nl
atlas.hostnet.nl
Other
527ms
169 KB
62%
€3/mo
Costly
sst.hostnet.nl
sst.hostnet.nl
Other
388ms
171 KB
37%
€2/mo
Costly
www.hostnet.nl
www.hostnet.nl
Other
264ms
40 KB
55%
€1/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
243ms
144 KB
49%
€1/mo
Costly
sst.hostnet.nl
sst.hostnet.nl
Other
174ms
172 KB
36%
€1/mo
Optional
consent.cookiebot.eu
consent.cookiebot.eu
Other
140ms
30 KB
—
€1/mo
Optional
atlantis.mijn.hostnet.nl
atlantis.mijn.hostnet.nl
Other
65ms
1 KB
—
€0/mo
Optional
www.hostnet.nl
www.hostnet.nl
Other
54ms
38 KB
63%
€0/mo
Optional
atlas.hostnet.nl
Other
Costly
Execution1392ms
Transfer25 KB
Monthly Cost€7/mo
www.hostnet.nl
Other
Costly
Execution1045ms
Transfer31 KB
Monthly Cost€6/mo
Unattributable
Other
Costly
Execution589ms
Transfer0 KB
Monthly Cost€3/mo
atlas.hostnet.nl
Other
Costly
Execution527ms
Transfer169 KB
Unused62%
Monthly Cost€3/mo
sst.hostnet.nl
Other
Costly
Execution388ms
Transfer171 KB
Unused37%
Monthly Cost€2/mo
www.hostnet.nl
Other
Costly
Execution264ms
Transfer40 KB
Unused55%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Costly
Execution243ms
Transfer144 KB
Unused49%
Monthly Cost€1/mo
sst.hostnet.nl
Other
Optional
Execution174ms
Transfer172 KB
Unused36%
Monthly Cost€1/mo
consent.cookiebot.eu
Other
Optional
Execution140ms
Transfer30 KB
Monthly Cost€1/mo
atlantis.mijn.hostnet.nl
Other
Optional
Execution65ms
Transfer1 KB
Monthly Cost€0/mo
www.hostnet.nl
Other
Optional
Execution54ms
Transfer38 KB
Unused63%
Monthly Cost€0/mo
These scripts may cost more than they're worth
atlas.hostnet.nl adds 1392ms and costs ~€7/month
www.hostnet.nl adds 1045ms and costs ~€6/month
Unattributable adds 589ms and costs ~€3/month
atlas.hostnet.nl adds 527ms and costs ~€3/month
sst.hostnet.nl adds 388ms and costs ~€2/month
www.hostnet.nl adds 264ms and costs ~€1/month
Google Tag Manager adds 243ms and costs ~€1/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
atlas.hostnet.nl takes 1392ms 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.hostnet.nl takes 1045ms 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 589ms 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
atlas.hostnet.nl takes 527ms 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 atlas.hostnet.nl'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
sst.hostnet.nl takes 388ms 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.hostnet.nl takes 264ms 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
55% of www.hostnet.nl'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 243ms 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
63% of www.hostnet.nl'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.