https://sxsw.com/wp-content/uploads/2025/06/Image.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/uploads/2025/06/Image-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/uploads/2025/10/SXSW-2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/themes/wp-theme-sxsw/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/themes/wp-theme-sxsw/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/uploads/2026/03/Hand-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sxsw.com/wp-content/uploads/2025/06/Image-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26images4.2 MB
0oversized-0 KB
14legacy format
7missing 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
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
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A+
Third-Party Impact
10% third-party, 0 ms blocking
PASS
10% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 10% of page weight (1.2 MiB of 11.8 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
90%
First-party Third-party
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
11 fonts (554 KB)
PASS
11 fonts (554 KB)
Info::
i
11 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
11
554 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fontawesome-webfont.woff2woff2swap
Size76 KB
Load time82 ms
Start387 ms
RiskFOUT — text flashes from fallback to web font
foundersgrotesk-600.woffwoffswap
Size35 KB
Load time29 ms
Start820 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgroteskcondense...woffswap
Size31 KB
Load time29 ms
Start820 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
fa-solid-900.woff2woff2swap
Size153 KB
Load time46 ms
Start820 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
foundersgroteskmono-400...woffswap
Size32 KB
Load time39 ms
Start821 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesk-500.woffwoffswap
Size35 KB
Load time43 ms
Start826 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesk-300.woffwoffswap
Size31 KB
Load time41 ms
Start828 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesk-400.woffwoffswap
Size34 KB
Load time41 ms
Start828 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesktext-400...woffswap
Size43 KB
Load time24 ms
Start933 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesktext-500...woffswap
Size43 KB
Load time29 ms
Start933 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
foundersgrotesktext-700...woffswap
Size41 KB
Load time5 ms
Start2.4 s
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 ~174 KB and ~348 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
2
prefetch—
2 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
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
✓
Cache-Control header is set
Got: max-age=300, must-revalidate
Info::
✓
Effective TTL: 5 minutes (max-age=300)
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
max-age=300, must-revalidate
Directive
Value
Meaning
max-age
300
Cache for 5 minutes
must-revalidate
—
Must recheck with server after expiry
Effective TTL: 300 seconds
Network Waterfall
95 requests over 2796ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76%of JavaScript execution is third-party
First-party Third-party4945ms · 1161KB · $28/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cmp.osano.com
cmp.osano.com
Other
1610ms
71 KB
—
$9/mo
Costly
Unattributable
Unattributable
Other
1040ms
0 KB
—
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
745ms
180 KB
32%
$4/mo
Costly
js.hsforms.net
js.hsforms.net
Other
434ms
194 KB
39%
$2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
421ms
154 KB
42%
$2/mo
Costly
www.gstatic.com
www.gstatic.com
Other
250ms
362 KB
67%
$1/mo
Costly
unpkg
unpkg.com
CDN
140ms
0 KB
—
$1/mo
Optional
cdn.parsely.com
cdn.parsely.com
Other
119ms
18 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
119ms
180 KB
63%
$1/mo
Optional
unpkg
unpkg.com
CDN
67ms
0 KB
—
$0/mo
Optional
cmp.osano.com
Other
Costly
Execution1610ms
Transfer71 KB
Monthly Cost$9/mo
Unattributable
Other
Costly
Execution1040ms
Transfer0 KB
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution745ms
Transfer180 KB
Unused32%
Monthly Cost$4/mo
js.hsforms.net
Other
Costly
Execution434ms
Transfer194 KB
Unused39%
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Costly
Execution421ms
Transfer154 KB
Unused42%
Monthly Cost$2/mo
www.gstatic.com
Other
Costly
Execution250ms
Transfer362 KB
Unused67%
Monthly Cost$1/mo
unpkg
CDN
Optional
Execution140ms
Transfer0 KB
Monthly Cost$1/mo
cdn.parsely.com
Other
Optional
Execution119ms
Transfer18 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution119ms
Transfer180 KB
Unused63%
Monthly Cost$1/mo
unpkg
CDN
Optional
Execution67ms
Transfer0 KB
Monthly Cost$0/mo
These scripts may cost more than they're worth
cmp.osano.com adds 1610ms and costs ~$9/month
Unattributable adds 1040ms and costs ~$6/month
Google Tag Manager adds 745ms and costs ~$4/month
js.hsforms.net adds 434ms and costs ~$2/month
Google Tag Manager adds 421ms and costs ~$2/month
www.gstatic.com adds 250ms and costs ~$1/month
76% 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
cmp.osano.com takes 1610ms 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 1040ms 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 745ms 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
js.hsforms.net takes 434ms 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 421ms 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.gstatic.com takes 250ms 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.
Source: web.dev
63% 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.