JavaScript is 804 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 804 KB
Info::
✓
48 HTTP requests
Info::
i
Estimated 0.34 g CO2 per page load
1.6 MBtransferred
48 requests
0.34 g CO2 per page load
JavaScript803.8 KiB49%
Images484.1 KiB29%
HTML153.0 KiB9%
CSS130.3 KiB8%
Fonts75.1 KiB5%
Other1.8 KiB0%
Other0 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
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
!
https://hb.imgix.net/f7b130676b08920ba11b45f2f5355... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.ziffstatic.com/pub/icong1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.humblebundle.com/static/hashed/0fe3a7d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.humblebundle.com/static/hashed/14ba8ec... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://hb.imgix.net/49ca7e1f06206b7ccc8193e7fc095... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26images484 KB
0oversized-0 KB
9legacy format
5missing 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
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
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
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 (75 KB)
PASS
3 fonts (75 KB)
Info::
i
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
75 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
c2226554e6f3134157cadf1...woff2swap
Size31 KB
Load time87 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
9e29ad97c24ce996ebe7aef...woff2swap
Size22 KB
Load time100 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
0052ab0bbfee0e88edc1e6c...woff2swap
Size22 KB
Load time89 ms
Start1.4 s
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
✓
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload
1
dns-prefetch—
prefetch—
1 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
✓
Cache-Control header is set
Got: max-age=3600
Info::
✓
Effective TTL: 1 hour (max-age=3600)
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
max-age=3600
Directive
Value
Meaning
max-age
3600
Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
48 requests over 2110ms
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-party3350ms · 926KB · €58/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cdn.humblebundle.com
cdn.humblebundle.com
Other
1159ms
153 KB
54%
€20/mo
Costly
www.humblebundle.com
www.humblebundle.com
Other
1100ms
151 KB
—
€19/mo
Costly
Unattributable
Unattributable
Other
389ms
0 KB
—
€7/mo
Costly
cdn.humblebundle.com
cdn.humblebundle.com
Other
258ms
177 KB
34%
€4/mo
Costly
www.gstatic.com
www.gstatic.com
Other
180ms
362 KB
67%
€3/mo
Optional
cdn.humblebundle.com
cdn.humblebundle.com
Other
177ms
82 KB
44%
€3/mo
Optional
cdn.ziffstatic.com
cdn.ziffstatic.com
Other
88ms
0 KB
—
€2/mo
Optional
cdn.humblebundle.com
Other
Costly
Execution1159ms
Transfer153 KB
Unused54%
Monthly Cost€20/mo
www.humblebundle.com
Other
Costly
Execution1100ms
Transfer151 KB
Monthly Cost€19/mo
Unattributable
Other
Costly
Execution389ms
Transfer0 KB
Monthly Cost€7/mo
cdn.humblebundle.com
Other
Costly
Execution258ms
Transfer177 KB
Unused34%
Monthly Cost€4/mo
www.gstatic.com
Other
Optional
Execution180ms
Transfer362 KB
Unused67%
Monthly Cost€3/mo
cdn.humblebundle.com
Other
Optional
Execution177ms
Transfer82 KB
Unused44%
Monthly Cost€3/mo
cdn.ziffstatic.com
Other
Optional
Execution88ms
Transfer0 KB
Monthly Cost€2/mo
These scripts may cost more than they're worth
cdn.humblebundle.com adds 1159ms and costs ~€20/month
www.humblebundle.com adds 1100ms and costs ~€19/month
Unattributable adds 389ms and costs ~€7/month
cdn.humblebundle.com adds 258ms and costs ~€4/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
cdn.humblebundle.com takes 1159ms 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 cdn.humblebundle.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
www.humblebundle.com takes 1100ms 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 389ms 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
cdn.humblebundle.com takes 258ms 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
67% of www.gstatic.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.