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https://woocommerce.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
3
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.10 s

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

1.93 s

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

134 ms

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

0.011

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

3.40 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.

8.29 s

Page Load Progression

786 ms
1.6 s
2.4 s
3.1 s
3.9 s
4.7 s
5.5 s
6.3 s
Checks
14
7 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
9.0 MB transferred, 191 requests
FIX
9.0 MB transferred, 191 requests
Critical::
Page weighs 13.6 MB (9.0 MB transferred)
Warning::
Images are 6.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.3 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Warning::
191 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.9 g CO2 per page load
9.0 MB / 2.4 MB budget
9.0 MB transferred
191 requests
1.9 g CO2 per page load
Images 6.3 MiB 69%
JavaScript 1.5 MiB 17%
Fonts 1.1 MiB 12%
CSS 100.9 KiB 1%
HTML 62.7 KiB 1%
Other 9.0 KiB 0%
Other 7.5 KiB 0%
Other 1.8 KiB 0%
Other 553 B 0%
Other 0 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
JS Execution Cost
Action
2485ms total JS execution
FIX
2485ms total JS execution
Warning::
https://woocommerce.com/: 648ms CPU time
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 516ms CPU time
Warning::
Unattributable: 396ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W64...: 158ms CPU time
Info::
https://woocommerce.com/wp-includes/js/dist/vendor...: 135ms CPU time
Warning::
Third-party scripts: 1570ms (63% of total)

Main Thread Breakdown

Script Evaluation 49% Other 22% Style & Layout 15% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://woocommerce.com/648ms39ms12ms1st
https://fast.wistia.com/assets/external/E-v1.js516ms385ms33ms3rd
Unattributable396ms27ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W64W8Q158ms129ms20ms3rd
https://woocommerce.com/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.1135ms122ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-98K30SHWB2&cx=c&gtm=4e6411127ms104ms22ms3rd
https://woocommerce.com/wp-content/themes/woo/dist/bundle.min.js?ver=58af148a197a959344e1ecc3b47eefc28fa9969976ms12ms1ms1st
https://www.googletagmanager.com/gtag/destination?id=AW-878432221&cx=c&gtm=4e641176ms61ms14ms3rd
https://connect.facebook.net/signals/config/743980872357899?v=2.9.291&r=stable&domain=woocommerce.com&hme=295b1b33901e14aeab879c0b58f907ef4d5f44fdd19814310771af911c5f6ac8&ex_m=102%2C198%2C147%2C22%2C70%2C71%2C139%2C66%2C65%2C11%2C155%2C88%2C16%2C132%2C124%2C37%2C73%2C76%2C130%2C152%2C157%2C8%2C4%2C5%2C7%2C6%2C3%2C89%2C99%2C158%2C163%2C212%2C60%2C179%2C180%2C53%2C267%2C30%2C72%2C224%2C223%2C222%2C23%2C32%2C101%2C59%2C10%2C61%2C95%2C96%2C97%2C103%2C127%2C31%2C29%2C129%2C126%2C125%2C148%2C74%2C151%2C149%2C150%2C48%2C58%2C120%2C15%2C154%2C43%2C254%2C255%2C253%2C26%2C27%2C28%2C46%2C140%2C75%2C110%2C18%2C20%2C42%2C38%2C40%2C39%2C81%2C90%2C94%2C108%2C138%2C141%2C44%2C109%2C24%2C21%2C116%2C67%2C35%2C143%2C142%2C144%2C135%2C133%2C25%2C34%2C57%2C107%2C153%2C68%2C17%2C145%2C112%2C79%2C64%2C19%2C83%2C84%2C113%2C82%2C33%2C284%2C205%2C194%2C195%2C193%2C287%2C279%2C50%2C206%2C105%2C128%2C78%2C118%2C52%2C45%2C47%2C111%2C117%2C123%2C56%2C62%2C51%2C54%2C98%2C156%2C1%2C121%2C14%2C119%2C12%2C2%2C55%2C91%2C63%2C115%2C87%2C86%2C159%2C160%2C92%2C93%2C9%2C122%2C100%2C49%2C136%2C85%2C77%2C69%2C114%2C104%2C41%2C137%2C0%2C80%2C131%2C134%2C146%2C36%2C106%2C13%2C16171ms59ms9ms3rd
https://cdn.parsely.com/keys/woocommerce.com/p.js70ms67ms2ms3rd

Showing top 10 of 14 scripts

D
JS Bundles
Action
78 scripts, 477 KB unused
FIX
78 scripts, 477 KB unused
Warning::
https://fast.wistia.com/assets/external/engines/hl...: 122 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 80 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-98K3...: 65 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 61 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W64...: 59 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 477 KB
477 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fast.wistia.com/assets/external/engines/hls_video.js@d8ce1c87dcf1b9a4d8e0c7f1f6f913f9fec9e6c5159 KB122 KB (77%)✓3rd
https://fast.wistia.com/assets/external/E-v1.js162 KB80 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-98K30SHWB2&cx=c&gtm=4e6411172 KB65 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-878432221&cx=c&gtm=4e6411143 KB61 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W64W8Q168 KB59 KB (35%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB36 KB (64%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB34 KB (36%)✓3rd
https://browser.sentry-cdn.com/9.6.1/bundle.min.js25 KB21 KB (86%)✓3rd
https://woocommerce.com/_static/??-eJyVkUFOAzEMRS9E6iKKqi4QZ0kTz9RDEke2w4jbkwYWrVpVsMzP9/O3DWt1gYthMbATZlRYmSGSGkTOLvtCtSVvxAUmZkNxhrl2BTeZymbRJ7hg1NRmKgMSOGeUgOBV0RQWBeXWhWPTjrl6/B81ybBFYIk9kzcTOrZzzIes0FHuDtndYJyJDx9U5oumP+XUmbOMlfwhs6vCsQVzgkMqcVTqvVnW0N2pL52upqASUos4vOMyn93Mcv6qnL4mSunX/p7fnvf715ft7rDdLd99grZP20 KB—✓1st
https://static.klaviyo.com/onsite/js/build-preview/commit-f6f00cac0c842ff6b918911ae9159db809c1b007/vendors~in_app_forms~signup_forms~reviews~atlas.0201e888d834a3782e3a.js?cb=211 KB—✓3rd

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

C
Image Optimization
Action
73 images, 0 KB saveable
REVIEW
73 images, 0 KB saveable
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/themes/woo/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2023/09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://woocommerce.com/wp-content/uploads/2025/02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
73 images 6.3 MB
0 oversized -0 KB
18 legacy format
27 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

Performance issues directly impact user engagement and conversion rates.

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

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

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
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (1.4 MiB of 9.0 MiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
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
4 fonts (1096 KB)
PASS
4 fonts (1096 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

1096 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.9 shttps://woocommerce.com/wp-content/themes/woo/fonts/inter-var/Inter-roman-var.woff2?v=3.19Inter-roman-var.woff2 https://woocommerce.com/wp-content/themes/woo/fonts/inter-var/Inter-roman-var.woff2?v=3.19 — 222.4 KiB — 0 ms — font-display: swaphttps://woocommerce.com/wp-content/themes/woo/fonts/proxima-vara/ProximaVara.woff2ProximaVara.woff2 https://woocommerce.com/wp-content/themes/woo/fonts/proxima-vara/ProximaVara.woff2 — 298.8 KiB — 0 ms — font-display: swaphttps://woocommerce.com/wp-content/themes/woo/fonts/inter-var/Inter-italic-var.woff2?v=3.19Inter-italic-var.woff2 https://woocommerce.com/wp-content/themes/woo/fonts/inter-var/Inter-italic-var.woff2?v=3.19 — 239.9 KiB — 0 ms — font-display: swaphttps://woocommerce.com/wp-content/themes/woo/fonts/font-awesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://woocommerce.com/wp-content/themes/woo/fonts/font-awesome/webfonts/fa-regular-400.woff2 — 334.7 KiB — 0 ms — font-display: swap
Inter-roman-var.woff2 woff2 swap
Size 222 KB
Load time 0 ms
Start 0 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
ProximaVara.woff2 woff2 swap
Size 299 KB
Load time 0 ms
Start 0 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
Inter-italic-var.woff2 woff2 swap
Size 240 KB
Load time 0 ms
Start 0 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
fa-regular-400.woff2 woff2 swap
Size 335 KB
Load time 0 ms
Start 0 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
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 ~548 KB and ~1096 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
HTTP Caching
max-age=1800 (30 minutes)
PASS
max-age=1800 (30 minutes)
Info::
Cache-Control header is set
Got: public, max-age=1800
Info::
Effective TTL: 30 minutes (max-age=1800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=1800

DirectiveValueMeaning
public—Any cache may store this response
max-age1800Cache for 30 minutes
Effective TTL: 1800 seconds
Network Waterfall
191 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
63% of JavaScript execution is third-party
First-party Third-party 1570ms · 857KB · $9/mo
fast.wistia.com
Other
Costly
Execution 516ms
Transfer 162 KB
Unused 50%
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 396ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 158ms
Transfer 168 KB
Unused 35%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 127ms
Transfer 172 KB
Unused 38%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 143 KB
Unused 43%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 71ms
Transfer 37 KB
Monthly Cost $0/mo
cdn.parsely.com
Other
Optional
Execution 70ms
Transfer 21 KB
Monthly Cost $0/mo
Hotjar
Session Replay
Optional
Execution 55ms
Transfer 57 KB
Unused 64%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 51ms
Transfer 95 KB
Unused 36%
Monthly Cost $0/mo
static.klaviyo.com
Other
Optional
Execution 50ms
Transfer 3 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • fast.wistia.com adds 516ms and costs ~$3/month
  • Unattributable adds 396ms and costs ~$2/month

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

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Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

fast.wistia.com takes 516ms 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 396ms 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

64% of Hotjar'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

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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