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
1.9 MB transferred, 97 requests
REVIEW
1.9 MB transferred, 97 requests
Info::
i
Page weighs 6.0 MB (1.9 MB transferred)
Warning::
!
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
i
97 HTTP requests
Info::
i
Estimated 0.40 g CO2 per page load
1.9 MBtransferred
97 requests
0.40 g CO2 per page load
JavaScript1.4 MiB74%
HTML301.1 KiB15%
Fonts104.8 KiB5%
Images76.9 KiB4%
Other24.3 KiB1%
Other3.5 KiB0%
Other1.6 KiB0%
Other660 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
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+
Image Optimization
6 images, 0 KB saveable
PASS
6 images, 0 KB saveable
Info::
✓
All images are well-optimized
6images77 KB
0oversized-0 KB
0legacy format
0missing dimensionsCLS risk
A+
Font Loading
7 fonts (105 KB)
PASS
7 fonts (105 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
105 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
public-sans-regular.woff2woff2swap
Size13 KB
Load time61 ms
Start145 ms
RiskFOUT — text flashes from fallback to web font
public-sans-600.woff2woff2swap
Size13 KB
Load time55 ms
Start145 ms
RiskFOUT — text flashes from fallback to web font
public-sans-800.woff2woff2swap
Size13 KB
Load time60 ms
Start146 ms
RiskFOUT — text flashes from fallback to web font
ibm-plex-serif-regular....woff2swap
Size19 KB
Load time60 ms
Start146 ms
RiskFOUT — text flashes from fallback to web font
ibm-plex-serif-500.woff2woff2swap
Size19 KB
Load time60 ms
Start146 ms
RiskFOUT — text flashes from fallback to web font
ibm-plex-serif-700.woff2woff2swap
Size19 KB
Load time60 ms
Start147 ms
RiskFOUT — text flashes from fallback to web font
icomoon_larazon.woffwoffswap
Size8 KB
Load time56 ms
Start147 ms
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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
✓
Page uses 14 resource hint(s)
Current Resource Hints
preconnect
4
preload
8
dns-prefetch
2
prefetch—
14 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
97 requests over 2348ms
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-party4132ms · 1281KB · €45/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.larazon.es
www.larazon.es
Other
942ms
271 KB
—
€10/mo
Costly
Unattributable
Unattributable
Other
771ms
0 KB
—
€8/mo
Costly
sdk.mrf.io
sdk.mrf.io
Other
543ms
60 KB
48%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
328ms
145 KB
39%
€4/mo
Costly
sdk.privacy-center.org
sdk.privacy-center.org
Other
262ms
102 KB
46%
€3/mo
Costly
sdk.privacy-center.org
sdk.privacy-center.org
Other
226ms
53 KB
—
€2/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
190ms
188 KB
76%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
181ms
148 KB
42%
€2/mo
Optional
hb.20m.es
hb.20m.es
Other
139ms
107 KB
80%
€2/mo
Optional
c.amazon-adsystem.com
c.amazon-adsystem.com
Other
125ms
91 KB
63%
€1/mo
Optional
cdnjs-2.atresmedia.com
cdnjs-2.atresmedia.com
Other
111ms
1 KB
—
€1/mo
Optional
sdk.privacy-center.org
sdk.privacy-center.org
Other
80ms
1 KB
—
€1/mo
Optional
dkumiip2e9ary.cloudfront.net
dkumiip2e9ary.cloudfront.net
Other
80ms
49 KB
59%
€1/mo
Optional
es-config.sensic.net
es-config.sensic.net
Other
76ms
31 KB
—
€1/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
75ms
35 KB
—
€1/mo
Optional
www.larazon.es
Other
Costly
Execution942ms
Transfer271 KB
Monthly Cost€10/mo
Unattributable
Other
Costly
Execution771ms
Transfer0 KB
Monthly Cost€8/mo
sdk.mrf.io
Other
Costly
Execution543ms
Transfer60 KB
Unused48%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution328ms
Transfer145 KB
Unused39%
Monthly Cost€4/mo
sdk.privacy-center.org
Other
Costly
Execution262ms
Transfer102 KB
Unused46%
Monthly Cost€3/mo
sdk.privacy-center.org
Other
Costly
Execution226ms
Transfer53 KB
Monthly Cost€2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution190ms
Transfer188 KB
Unused76%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution181ms
Transfer148 KB
Unused42%
Monthly Cost€2/mo
hb.20m.es
Other
Optional
Execution139ms
Transfer107 KB
Unused80%
Monthly Cost€2/mo
c.amazon-adsystem.com
Other
Optional
Execution125ms
Transfer91 KB
Unused63%
Monthly Cost€1/mo
cdnjs-2.atresmedia.com
Other
Optional
Execution111ms
Transfer1 KB
Monthly Cost€1/mo
sdk.privacy-center.org
Other
Optional
Execution80ms
Transfer1 KB
Monthly Cost€1/mo
dkumiip2e9ary.cloudfront.net
Other
Optional
Execution80ms
Transfer49 KB
Unused59%
Monthly Cost€1/mo
es-config.sensic.net
Other
Optional
Execution76ms
Transfer31 KB
Monthly Cost€1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution75ms
Transfer35 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.larazon.es adds 942ms and costs ~€10/month
Unattributable adds 771ms and costs ~€8/month
sdk.mrf.io adds 543ms and costs ~€6/month
Google Tag Manager adds 328ms and costs ~€4/month
sdk.privacy-center.org adds 262ms and costs ~€3/month
sdk.privacy-center.org adds 226ms and costs ~€2/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.larazon.es takes 942ms 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 771ms 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
sdk.mrf.io takes 543ms 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 328ms 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
sdk.privacy-center.org takes 262ms 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
sdk.privacy-center.org takes 226ms 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
76% 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
80% of hb.20m.es'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
63% of c.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
59% of dkumiip2e9ary.cloudfront.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.