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https://netflix.shop

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

5.12 s

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

13.36 s

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

2.01 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.

11.24 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.

26.44 s

Page Load Progression

947 ms
1.9 s
2.8 s
3.8 s
4.7 s
5.7 s
6.6 s
7.6 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 296 requests
FIX
3.9 MB transferred, 296 requests
Critical::
Page weighs 9.8 MB (3.9 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
Fonts are 293 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 293 KB
Warning::
296 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.82 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
296 requests
0.82 g CO2 per page load
JavaScript 1.9 MiB 49%
Other 777.6 KiB 19%
Images 605.9 KiB 15%
Fonts 293.2 KiB 7%
HTML 176.4 KiB 4%
CSS 117.2 KiB 3%
Other 31.9 KiB 1%
Other 29.6 KiB 1%
Other 6.5 KiB 0%
Other 1.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.9 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
21474ms total JS execution
FIX
21474ms total JS execution
Warning::
https://www.netflix.shop/en-es: 10195ms CPU time
Warning::
https://www.netflix.shop/cdn/shop/t/558/assets/app...: 3872ms CPU time
Warning::
Unattributable: 1629ms CPU time
Warning::
https://cdn.shopify.com/extensions/019d6725-fee7-7...: 993ms CPU time
Warning::
https://cdn.shopify.com/extensions/019d59a1-02f7-7...: 572ms CPU time
Warning::
Third-party scripts: 21474ms (100% of total)

Main Thread Breakdown

Style & Layout 38% Script Evaluation 23% Other 19% Rendering 15%
ScriptTotalScriptingParse/CompileParty
https://www.netflix.shop/en-es10195ms118ms90ms3rd
https://www.netflix.shop/cdn/shop/t/558/assets/app.min.js?v=1270129012394679042817743626353872ms676ms35ms3rd
Unattributable1629ms113ms0ms3rd
https://cdn.shopify.com/extensions/019d6725-fee7-7c7f-a0d0-e4dbfff476c9/wiser-ai-upsell-cross-sell-1829/assets/wiser_2.0.js993ms390ms60ms3rd
https://cdn.shopify.com/extensions/019d59a1-02f7-7559-bd14-8ff7eaf3ebe2/rivo-loyalty-rewards-referrals-760/assets/ba_rivo_profile.js572ms458ms28ms3rd
https://script.crazyegg.com/pages/versioned/tracking-scripts/82e5ba57b94e70a81483b8547f7ad7b0.js487ms445ms6ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PGNJKX8333ms251ms50ms3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-98747c9b1816a2f78e748cdc073a286a0296d9f7/vendors~in_app_forms~signup_forms~reviews~atlas.0201e888d834a3782e3a.js?cb=2331ms205ms3ms3rd
https://www.netflix.shop/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js320ms171ms22ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/fa37f361d63404d4cc11b194e70c4ff0.js285ms205ms14ms3rd

Showing top 10 of 28 scripts

F
JS Bundles
Action
197 scripts, 623 KB unused
FIX
197 scripts, 623 KB unused
Warning::
https://cdn.shopify.com/extensions/019d4452-a688-7...: 96 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.shopify.com/extensions/019d6725-fee7-7...: 87 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 67 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PGN...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d3hw6dc1ow8pp2.cloudfront.net/reviewsWidge...: 56 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 623 KB
623 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.shopify.com/extensions/019d4452-a688-7f62-a580-35eb5d108d70/fast-bundle-product-bundles-78/assets/main.min.js192 KB96 KB (50%)✓3rd
https://cdn.shopify.com/extensions/019d6725-fee7-7c7f-a0d0-e4dbfff476c9/wiser-ai-upsell-cross-sell-1829/assets/wiser_2.0.js156 KB87 KB (56%)✓3rd
https://accounts.google.com/gsi/client93 KB67 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PGNJKX8174 KB67 KB (38%)✓3rd
https://d3hw6dc1ow8pp2.cloudfront.net/reviewsWidget.min.js?shop=ntflx-en-us-main-001.myshopify.com87 KB56 KB (65%)✓3rd
https://www.netflix.shop/cdn/shop/t/558/assets/app.min.js?v=12701290123946790428177436263587 KB48 KB (56%)✓3rd
https://static.ada.support/embed2.84129bb.js65 KB38 KB (59%)✓3rd
https://cdn.shopify.com/extensions/019d4452-a688-7f62-a580-35eb5d108d70/fast-bundle-product-bundles-78/assets/vendor.js62 KB35 KB (58%)✓3rd
https://cdn.customily.com/shopify/static/customily.shopify.script.js?shop=ntflx-en-us-main-001.myshopify.com48 KB32 KB (67%)✓3rd
https://cdn.shopify.com/extensions/019d59a1-02f7-7559-bd14-8ff7eaf3ebe2/rivo-loyalty-rewards-referrals-760/assets/ba_rivo_profile.js63 KB27 KB (43%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.netflix.shop/cdn/shop/files/OP-S2-0326... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shop/files/OP-LCSBH_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shop/files/OP-SHP_56_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shop/files/OP-KLHA-04... 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://www.netflix.shop/cdn/shop/files/Snow_Comme... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shop/files/915398_sil... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shop/files/NCA98Y1NET... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netflix.shop/cdn/shopifycloud/storefro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3k81ch9hvuctc.cloudfront.net/company/S2UC... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 606 KB
0 oversized -0 KB
4 legacy format
10 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

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

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
6 fonts (293 KB)
PASS
6 fonts (293 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

293 KB total

Render-blocking

0

of 6

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 FCP 5.1 s LCP 13.4 shttps://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Bd.woff2?v=125908002224056450621774362635NetflixSans_W_Bd.woff2 https://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Bd.woff2?v=125908002224056450621774362635 — 50.1 KiB — 0 ms — font-display: swaphttps://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Md.woff2?v=130958336834417874751774362635NetflixSans_W_Md.woff2 https://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Md.woff2?v=130958336834417874751774362635 — 48.6 KiB — 0 ms — font-display: swaphttps://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Rg.woff2?v=131032504100285825701774362635NetflixSans_W_Rg.woff2 https://www.netflix.shop/cdn/shop/t/558/assets/NetflixSans_W_Rg.woff2?v=131032504100285825701774362635 — 48.1 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0522/8222/8911/t/2/assets/NetflixSans_W_Bd.woff2?v=12590800222405645062NetflixSans_W_Bd.woff2 https://cdn.shopify.com/s/files/1/0522/8222/8911/t/2/assets/NetflixSans_W_Bd.woff2?v=12590800222405645062 — 50.0 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0522/8222/8911/t/2/assets/NetflixSans_W_Rg.woff2?v=13103250410028582570NetflixSans_W_Rg.woff2 https://cdn.shopify.com/s/files/1/0522/8222/8911/t/2/assets/NetflixSans_W_Rg.woff2?v=13103250410028582570 — 48.0 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0522/8222/8911/files/NetflixSans_W_Md.woff2NetflixSans_W_Md.woff2 https://cdn.shopify.com/s/files/1/0522/8222/8911/files/NetflixSans_W_Md.woff2 — 48.5 KiB — 0 ms — font-display: swap
NetflixSans_W_Bd.woff2 woff2 swap
Size 50 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NetflixSans_W_Md.woff2 woff2 swap
Size 49 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NetflixSans_W_Rg.woff2 woff2 swap
Size 48 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NetflixSans_W_Bd.woff2 woff2 swap
Size 50 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NetflixSans_W_Rg.woff2 woff2 swap
Size 48 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NetflixSans_W_Md.woff2 woff2 swap
Size 49 KB
Load time 0 ms
Start 0 ms
Risk FOUT — 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
1
prefetch
1

3 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

Network Waterfall
296 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
100% of JavaScript execution is third-party
First-party Third-party 21474ms · 1370KB · €114/mo
www.netflix.shop
Other
Costly
Execution 10195ms
Transfer 85 KB
Monthly Cost €54/mo
www.netflix.shop
Other
Costly
Execution 3872ms
Transfer 87 KB
Unused 56%
Monthly Cost €21/mo
Unattributable
Other
Costly
Execution 1629ms
Transfer 0 KB
Monthly Cost €9/mo
cdn.shopify.com
Other
Costly
Execution 993ms
Transfer 156 KB
Unused 56%
Monthly Cost €5/mo
cdn.shopify.com
Other
Costly
Execution 572ms
Transfer 63 KB
Unused 43%
Monthly Cost €3/mo
script.crazyegg.com
Other
Costly
Execution 487ms
Transfer 22 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 333ms
Transfer 174 KB
Unused 38%
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 331ms
Transfer 10 KB
Monthly Cost €2/mo
www.netflix.shop
Other
Costly
Execution 320ms
Transfer 61 KB
Unused 42%
Monthly Cost €2/mo
script.crazyegg.com
Other
Costly
Execution 285ms
Transfer 51 KB
Unused 47%
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 256ms
Transfer 23 KB
Monthly Cost €1/mo
www.netflix.shop
Other
Costly
Execution 226ms
Transfer 31 KB
Monthly Cost €1/mo
static.ada.support
Other
Costly
Execution 222ms
Transfer 65 KB
Unused 59%
Monthly Cost €1/mo
www.netflix.shop
Other
Costly
Execution 213ms
Transfer 1 KB
Monthly Cost €1/mo
cdn.shopify.com
Other
Optional
Execution 193ms
Transfer 192 KB
Unused 50%
Monthly Cost €1/mo
www.netflix.shop
Other
Optional
Execution 165ms
Transfer 21 KB
Monthly Cost €1/mo
www.netflix.shop
Other
Optional
Execution 151ms
Transfer 4 KB
Monthly Cost €1/mo
cdn.customily.com
Other
Optional
Execution 151ms
Transfer 48 KB
Unused 67%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 143ms
Transfer 52 KB
Monthly Cost €1/mo
d3hw6dc1ow8pp2.cloudfront.net
Other
Optional
Execution 129ms
Transfer 87 KB
Unused 65%
Monthly Cost €1/mo
www.netflix.shop
Other
Optional
Execution 124ms
Transfer 2 KB
Monthly Cost €1/mo
www.netflix.shop
Other
Optional
Execution 103ms
Transfer 28 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 78ms
Transfer 8 KB
Monthly Cost €0/mo
cdn.shopify.com
Other
Optional
Execution 66ms
Transfer 6 KB
Monthly Cost €0/mo
code.jquery.com
Other
Optional
Execution 63ms
Transfer 29 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 63ms
Transfer 8 KB
Monthly Cost €0/mo
a.klaviyo.com
Other
Optional
Execution 58ms
Transfer 33 KB
Unused 64%
Monthly Cost €0/mo
www.netflix.shop
Other
Optional
Execution 55ms
Transfer 23 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.netflix.shop adds 10195ms and costs ~€54/month
  • www.netflix.shop adds 3872ms and costs ~€21/month
  • Unattributable adds 1629ms and costs ~€9/month
  • cdn.shopify.com adds 993ms and costs ~€5/month
  • cdn.shopify.com adds 572ms and costs ~€3/month
  • script.crazyegg.com adds 487ms and costs ~€3/month
  • Google Tag Manager adds 333ms and costs ~€2/month
  • static.klaviyo.com adds 331ms and costs ~€2/month
  • www.netflix.shop adds 320ms and costs ~€2/month
  • script.crazyegg.com adds 285ms and costs ~€2/month
  • static.klaviyo.com adds 256ms and costs ~€1/month
  • www.netflix.shop adds 226ms and costs ~€1/month
  • static.ada.support adds 222ms and costs ~€1/month
  • www.netflix.shop adds 213ms and costs ~€1/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.netflix.shop takes 10195ms 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.netflix.shop takes 3872ms 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

56% of www.netflix.shop'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

Unattributable takes 1629ms 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.shopify.com takes 993ms 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

56% of cdn.shopify.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

cdn.shopify.com takes 572ms 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

script.crazyegg.com takes 487ms 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 333ms 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

static.klaviyo.com takes 331ms 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.netflix.shop takes 320ms 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

script.crazyegg.com takes 285ms 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

static.klaviyo.com takes 256ms 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.netflix.shop takes 226ms 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

static.ada.support takes 222ms 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

59% of static.ada.support'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.netflix.shop takes 213ms 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

50% of cdn.shopify.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

67% of cdn.customily.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

65% of d3hw6dc1ow8pp2.cloudfront.net'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

64% of a.klaviyo.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

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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