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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

6.40 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

27.55 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.51 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.39 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

28.52 s

Page Load Progression

599 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
9 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
11.8 MB transferred, 95 requests
FIX
11.8 MB transferred, 95 requests
Critical::
Page weighs 15.5 MB (11.8 MB transferred)
Warning::
Images are 4.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.2 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 554 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 554 KB
Info::
95 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
11.8 MB / 2.4 MB budget
11.8 MB transferred
95 requests
2.5 g CO2 per page load
Other 5.5 MiB 47%
Images 4.2 MiB 36%
JavaScript 1.3 MiB 11%
Fonts 553.6 KiB 5%
CSS 130.9 KiB 1%
HTML 21.4 KiB 0%
Other 1.9 KiB 0%
Other 1.9 KiB 0%
Other 359 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

F
JS Execution Cost
Action
6467ms total JS execution
FIX
6467ms total JS execution
Warning::
https://cmp.osano.com/AzywLlTgj0ZEN5Fnv/1d881dc8-9...: 1610ms CPU time
Warning::
Unattributable: 1040ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-946...: 745ms CPU time
Warning::
https://sxsw.com/: 629ms CPU time
Warning::
https://sxsw.com/wp-content/themes/wp-theme-sxsw/d...: 586ms CPU time
Warning::
Third-party scripts: 4945ms (76% of total)

Main Thread Breakdown

Script Evaluation 45% Other 27% Style & Layout 13% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://cmp.osano.com/AzywLlTgj0ZEN5Fnv/1d881dc8-9a4f-47fd-9444-b5308e76584d/osano.js1610ms781ms39ms3rd
Unattributable1040ms41ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-946715973&cx=c&gtm=4e64h1745ms607ms83ms3rd
https://sxsw.com/629ms55ms11ms1st
https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/site.js?ver=1776711394586ms119ms1ms1st
https://js.hsforms.net/forms/v2.js434ms321ms87ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WB7Z9Q5421ms324ms92ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js250ms128ms121ms3rd
https://sxsw.com/wp-content/themes/wp-theme-sxsw/src/scripts/home-statement-parallax.js?ver=1770664436160ms140ms1ms1st
https://unpkg.com/gsap@3/dist/ScrollTrigger.min.js140ms86ms11ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
42 scripts, 573 KB unused
FIX
42 scripts, 573 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 243 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RLXX...: 114 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.hsforms.net/forms/v2.js: 73 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WB7...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-946...: 57 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 573 KB
573 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB243 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RLXXHDCCN4&cx=c&gtm=4e64h1180 KB114 KB (63%)✓3rd
https://js.hsforms.net/forms/v2.js194 KB73 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WB7Z9Q5154 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-946715973&cx=c&gtm=4e64h1180 KB57 KB (32%)✓3rd
https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/site.js?ver=177671139428 KB21 KB (76%)✓1st
https://sxsw.com/wp-content/mu-plugins/wp-parsely-3.23/build/loader.js?ver=ecf94842061bea03d54b2 KB—✓1st
https://sxsw.com/wp-content/themes/wp-theme-sxsw/src/scripts/home-video-autoplay.js?ver=17706644361 KB—✓1st
https://sxsw.com/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933752 KB—✓1st
https://sxsw.com/wp-includes/js/dist/url.min.js?ver=9e178c9516d1222dc8344 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
95 resources · 11.8 MB · 573 KB savings available
FIX
95 resources · 11.8 MB · 573 KB savings available
Warning::
Page weight 10.8 MB over 1MB target
Got: 11.8 MB Expected: ≤ 1 MB
Info::
~573 KB of savings available
Info::
29 third-party resources (10% of weight)
Info::
7 resources over 200KB
95 resources · 11.8 MiB · 29 third-party 10.8 MiB over 1MB target
Media 47% · 5.5 MiB
Image 36% · 4.2 MiB
JavaScript 11% · 1.3 MiB
Font 5% · 553.6 KiB
CSS 1% · 130.9 KiB
Document 0% · 21.5 KiB
Other 0% · 3.0 KiB

~572.7 KiB of savings available

Remove unused JavaScript: 572.7 KiB
C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
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/2025/06/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.
26 images 4.2 MB
0 oversized -0 KB
14 legacy format
7 missing dimensions CLS 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::
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::
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
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 6.4 s LCP 27.5 shttps://sxsw.com/wp-content/plugins/wp-testimonial-with-widget/assets/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://sxsw.com/wp-content/plugins/wp-testimonial-with-widget/assets/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.7 KiB — 82 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-600.wofffoundersgrotesk-600.woff https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-600.woff — 34.7 KiB — 29 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgroteskcondensed-600.wofffoundersgroteskcondense... https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgroteskcondensed-600.woff — 31.2 KiB — 29 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/fa-solid-900.woff2fa-solid-900.woff2 https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/fa-solid-900.woff2 — 153.2 KiB — 46 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgroteskmono-400.wofffoundersgroteskmono-400... https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgroteskmono-400.woff — 32.0 KiB — 39 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-500.wofffoundersgrotesk-500.woff https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-500.woff — 34.5 KiB — 43 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-300.wofffoundersgrotesk-300.woff https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-300.woff — 31.4 KiB — 41 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-400.wofffoundersgrotesk-400.woff https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesk-400.woff — 33.6 KiB — 41 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-400.wofffoundersgrotesktext-400... https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-400.woff — 43.1 KiB — 24 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-500.wofffoundersgrotesktext-500... https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-500.woff — 43.4 KiB — 29 ms — font-display: swaphttps://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-700.wofffoundersgrotesktext-700... https://sxsw.com/wp-content/themes/wp-theme-sxsw/dist/assets/foundersgrotesktext-700.woff — 40.9 KiB — 5 ms — font-display: swap
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 82 ms
Start 387 ms
Risk FOUT — text flashes from fallback to web font
foundersgrotesk-600.woff woff swap
Size 35 KB
Load time 29 ms
Start 820 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgroteskcondense... woff swap
Size 31 KB
Load time 29 ms
Start 820 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 46 ms
Start 820 ms
Risk FOUT — 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... woff swap
Size 32 KB
Load time 39 ms
Start 821 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesk-500.woff woff swap
Size 35 KB
Load time 43 ms
Start 826 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesk-300.woff woff swap
Size 31 KB
Load time 41 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesk-400.woff woff swap
Size 34 KB
Load time 41 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesktext-400... woff swap
Size 43 KB
Load time 24 ms
Start 933 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesktext-500... woff swap
Size 43 KB
Load time 29 ms
Start 933 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
foundersgrotesktext-700... woff swap
Size 41 KB
Load time 5 ms
Start 2.4 s
Risk FOUT — 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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300, must-revalidate

DirectiveValueMeaning
max-age300Cache for 5 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 300 seconds
Network Waterfall
95 requests over 2796ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 6.4 s LCP 27.5 shttps://sxsw.com// https://sxsw.com/ — 200 — 20.2 KiB — 106 ms — h2https://cmp.osano.com/AzywLlTgj0ZEN5Fnv/1d881dc8-9a4f-47fd-9444-b5308e76584d/osano.jscmp.osano.com/AzywLlTgj0ZEN5Fnv/1d8... https://cmp.osano.com/AzywLlTgj0ZEN5Fnv/1d881dc8-9a4f-47fd-9444-b5308e76584d/osano.js — 200 — 71.1 KiB — 71 ms — h3https://www.google.com/recaptcha/api.jswww.google.com/recaptcha/api.js https://www.google.com/recaptcha/api.js — 200 — 1012 B — 64 ms — h3https://sxsw.com/wp-includes/css/dist/block-library/style.min.css?m=1774626885g/wp-includes/css/dist/block-library... https://sxsw.com/wp-includes/css/dist/block-library/style.min.css?m=1774626885g — 200 — 16.0 KiB — 17 ms — h2https://sxsw.com/_static/??-eJylkdFOhTAMhl/InYVoJF4YL3wBE07ipRmjcKbbOtcS5O0tIIlGUdSbpf3b/9u66iEpi5Ehsk6+71wkPWBsIC+ZYlOTbqVDmQEIA2hLH4VDcPEg4pnexYIoIXwuqKWwSTpW6g6917dVpY/IxqsKW541de+aDniXlScriXOz+/G5hzyK7L1JBApVMOzsPLfFDA/Eo99+53d277oT/+AXiYHYBYxOhhwcn+SY5tOGCJh+uYBdOPLOPv2TMbD0pb4W1CbpLVcpI4NlzCtg8ekkKTHklfPVZHyCAMujpkjRCw3a9sQY9vV6V+t5B/KNYKSQ573sv+wdIEFu+9jgn8zt9OuOx9V8E66Lsrwsi+L86uIV49ddUA==/_static/??-eJylkdFOhTAMhl/InYVoJF4... https://sxsw.com/_static/??-eJylkdFOhTAMhl/InYVoJF4YL3wBE07ipRmjcKbbOtcS5O0tIIlGUdSbpf3b/9u66iEpi5Ehsk6+71wkPWBsIC+ZYlOTbqVDmQEIA2hLH4VDcPEg4pnexYIoIXwuqKWwSTpW6g6917dVpY/IxqsKW541de+aDniXlScriXOz+/G5hzyK7L1JBApVMOzsPLfFDA/Eo99+53d277oT/+AXiYHYBYxOhhwcn+SY5tOGCJh+uYBdOPLOPv2TMbD0pb4W1CbpLVcpI4NlzCtg8ekkKTHklfPVZHyCAMujpkjRCw3a9sQY9vV6V+t5B/KNYKSQ573sv+wdIEFu+9jgn8zt9OuOx9V8E66Lsrwsi+L86uIV49ddUA== — 200 — 16.1 KiB — 18 ms — h2https://sxsw.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... 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h2https://sxsw.com/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1/wp-includes/js/dist/hooks.min.js?v... https://sxsw.com/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 2.2 KiB — 63 ms — h2https://sxsw.com/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375/wp-includes/js/dist/i18n.min.js?ve... https://sxsw.com/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.5 KiB — 63 ms — h2https://sxsw.com/wp-includes/js/dist/url.min.js?ver=9e178c9516d1222dc834/wp-includes/js/dist/url.min.js?ver... https://sxsw.com/wp-includes/js/dist/url.min.js?ver=9e178c9516d1222dc834 — 200 — 4.0 KiB — 27 ms — h2https://sxsw.com/wp-includes/js/dist/api-fetch.min.js?ver=3a4d9af2b423048b0dee/wp-includes/js/dist/api-fetch.min.... https://sxsw.com/wp-includes/js/dist/api-fetch.min.js?ver=3a4d9af2b423048b0dee — 200 — 2.7 KiB — 32 ms — h2https://sxsw.com/wp-content/plugins/content-protector/assets/public/cookie.js?ver=4.3.3/wp-content/plugins/content-protect... 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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-party 4945ms · 1161KB · $28/mo
cmp.osano.com
Other
Costly
Execution 1610ms
Transfer 71 KB
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 1040ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 745ms
Transfer 180 KB
Unused 32%
Monthly Cost $4/mo
js.hsforms.net
Other
Costly
Execution 434ms
Transfer 194 KB
Unused 39%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 421ms
Transfer 154 KB
Unused 42%
Monthly Cost $2/mo
www.gstatic.com
Other
Costly
Execution 250ms
Transfer 362 KB
Unused 67%
Monthly Cost $1/mo
unpkg
CDN
Optional
Execution 140ms
Transfer 0 KB
Monthly Cost $1/mo
cdn.parsely.com
Other
Optional
Execution 119ms
Transfer 18 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 119ms
Transfer 180 KB
Unused 63%
Monthly Cost $1/mo
unpkg
CDN
Optional
Execution 67ms
Transfer 0 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.

Source: web.dev

How third-party costs are calculated

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