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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Info::
✓
All images are well-optimized
19images647 KB
0oversized-0 KB
16legacy 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 (175 KB)
PASS
3 fonts (175 KB)
Info::
i
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
175 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
font-woff;base64,d09GRg...woffswap
Size63 KB
Load time67 ms
Start407 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
font-woff;base64,d09GRg...woffswap
Size63 KB
Load time61 ms
Start417 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
font-woff;base64,d09GRg...woffswap
Size48 KB
Load time63 ms
Start419 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 ~52 KB and ~104 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
✓
Page uses 13 resource hint(s)
Current Resource Hints
preconnect
5
preload
3
dns-prefetch
5
prefetch—
13 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
70 requests over 2223ms
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-party4445ms · 1743KB · €48/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.eventbrite.de
www.eventbrite.de
Other
940ms
44 KB
—
€10/mo
Costly
www.eventbrite.de
www.eventbrite.de
Other
690ms
32 KB
—
€7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
414ms
197 KB
35%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
394ms
145 KB
45%
€4/mo
Costly
Unattributable
Unattributable
Other
380ms
0 KB
—
€4/mo
Costly
www.eventbrite.de
www.eventbrite.de
Other
251ms
206 KB
54%
€3/mo
Costly
www.eventbrite.de
www.eventbrite.de
Other
176ms
1 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
170ms
160 KB
43%
€2/mo
Optional
www.eventbrite.de
www.eventbrite.de
Other
169ms
42 KB
—
€2/mo
Optional
cdntranscend.eventbrite.com
cdntranscend.eventbrite.com
Other
155ms
90 KB
42%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
138ms
147 KB
44%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
132ms
146 KB
45%
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
130ms
131 KB
47%
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
124ms
145 KB
45%
€1/mo
Optional
cdntranscend.eventbrite.com
cdntranscend.eventbrite.com
Other
113ms
69 KB
—
€1/mo
Optional
www.eventbrite.de
www.eventbrite.de
Other
67ms
187 KB
32%
€1/mo
Optional
www.eventbrite.de
Other
Costly
Execution940ms
Transfer44 KB
Monthly Cost€10/mo
www.eventbrite.de
Other
Costly
Execution690ms
Transfer32 KB
Monthly Cost€7/mo
Google Tag Manager
Tag Manager
Costly
Execution414ms
Transfer197 KB
Unused35%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution394ms
Transfer145 KB
Unused45%
Monthly Cost€4/mo
Unattributable
Other
Costly
Execution380ms
Transfer0 KB
Monthly Cost€4/mo
www.eventbrite.de
Other
Costly
Execution251ms
Transfer206 KB
Unused54%
Monthly Cost€3/mo
www.eventbrite.de
Other
Optional
Execution176ms
Transfer1 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution170ms
Transfer160 KB
Unused43%
Monthly Cost€2/mo
www.eventbrite.de
Other
Optional
Execution169ms
Transfer42 KB
Monthly Cost€2/mo
cdntranscend.eventbrite.com
Other
Optional
Execution155ms
Transfer90 KB
Unused42%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution138ms
Transfer147 KB
Unused44%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution132ms
Transfer146 KB
Unused45%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution130ms
Transfer131 KB
Unused47%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution124ms
Transfer145 KB
Unused45%
Monthly Cost€1/mo
cdntranscend.eventbrite.com
Other
Optional
Execution113ms
Transfer69 KB
Monthly Cost€1/mo
www.eventbrite.de
Other
Optional
Execution67ms
Transfer187 KB
Unused32%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.eventbrite.de adds 940ms and costs ~€10/month
www.eventbrite.de adds 690ms and costs ~€7/month
Google Tag Manager adds 414ms and costs ~€4/month
Google Tag Manager adds 394ms and costs ~€4/month
Unattributable adds 380ms and costs ~€4/month
www.eventbrite.de adds 251ms 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
www.eventbrite.de takes 940ms 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.eventbrite.de takes 690ms 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 414ms 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 394ms 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 380ms 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.eventbrite.de takes 251ms 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 www.eventbrite.de'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.