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https://www.zoom.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
77
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.

4.48 s

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

15.29 s

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

1.34 s

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

0.170

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

5.34 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.

16.78 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
16
8 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 309 requests
FIX
3.7 MB transferred, 309 requests
Warning::
Page weighs 12.7 MB (3.7 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Warning::
JavaScript is 1010 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1010 KB
Info::
Fonts are 294 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 294 KB
Warning::
309 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
309 requests
0.78 g CO2 per page load
Images 2.2 MiB 59%
JavaScript 1010.2 KiB 26%
Fonts 293.8 KiB 8%
CSS 116.6 KiB 3%
HTML 65.7 KiB 2%
Other 50.4 KiB 1%
Other 6.6 KiB 0%
Other 5.0 KiB 0%
Other 385 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
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
10520ms total JS execution
FIX
10520ms total JS execution
Warning::
https://www.zoom.com/?cms_guid=false: 3209ms CPU time
Warning::
Unattributable: 1684ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5WK...: 1005ms CPU time
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary...: 750ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202409.2...: 694ms CPU time
Warning::
Third-party scripts: 6764ms (64% of total)

Main Thread Breakdown

Style & Layout 30% Other 27% Script Evaluation 27% Script Parsing & Compilation 6% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.zoom.com/?cms_guid=false3209ms106ms11ms1st
Unattributable1684ms264ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5WKFT91005ms632ms337ms3rd
https://st1.zoom.us/homepage/20260407-0049/primary/dist/main.js750ms212ms1ms3rd
https://cdn.cookielaw.org/scripttemplates/202409.2.0/otBannerSdk.js694ms252ms168ms3rd
https://st1.zoom.us/homepage/20260407-0049/primary/dist/components/product-hub-components/CustomerStoriesExpandedCards/CustomerStoriesExpandedCards.js631ms26ms1ms3rd
https://us01ccistatic.zoom.us/us01cci/web-sdk/9283/web-campaign.js?env=us01&apikey=AM_FKF55QOG_vdWum455Vg&lazyLoadCampaignUrl=_blank&v=9283530ms358ms9ms3rd
https://www.zoom.com/cdn-cgi/challenge-platform/scripts/jsd/main.js398ms379ms3ms1st
https://us01ccistatic.zoom.us/us01cci/web-sdk/chat-client.js364ms267ms19ms3rd
https://st1.zoom.us/homepage/20260407-0049/primary/dist/components/product-hub-components/CustomSwiperSlider/CustomSwiperSlider.js253ms18ms2ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
117 scripts, 532 KB unused
FIX
117 scripts, 532 KB unused
Warning::
https://us01ccistatic.zoom.us/us01cci/web-sdk/9283...: 159 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://us01ccistatic.zoom.us/us01cci/web-sdk/9283...: unminified — 92 KB could be saved
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5WK...: 73 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5WK...: 73 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202409.2...: 61 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202409.2...: 61 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 532 KB
532 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://us01ccistatic.zoom.us/us01cci/web-sdk/9283/web-campaign.js?env=us01&apikey=AM_FKF55QOG_vdWum455Vg&lazyLoadCampaignUrl=_blank&v=9283302 KB159 KB (53%)✗3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5WKFT9204 KB73 KB (36%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5WKFT90 KB73 KB (36%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202409.2.0/otBannerSdk.js112 KB61 KB (55%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202409.2.0/otBannerSdk.js0 KB61 KB (55%)✓3rd
https://st1.zoom.us/homepage/20260407-0049/primary/dist/js/utilities/swiper-bundle.min.js43 KB28 KB (67%)✓3rd
https://st1.zoom.us/homepage/20260407-0049/primary/dist/js/utilities/swiper-bundle.min.js0 KB28 KB (67%)✓3rd
https://us01ccistatic.zoom.us/us01cci/web-sdk/chat-client.js55 KB23 KB (42%)✓3rd
https://us01ccistatic.zoom.us/us01cci/web-sdk/chat-client.js55 KB23 KB (42%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 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
60 images, 0 KB saveable
REVIEW
60 images, 0 KB saveable
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... 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://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://st1.zoom.us/homepage/20260407-0049/primary... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
60 images 807 KB
0 oversized -0 KB
11 legacy format
17 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
10 fonts (294 KB)
PASS
10 fonts (294 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

294 KB total

Render-blocking

0

of 10

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 FCP 4.5 s LCP 15.3 shttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Regular-WebXL.woff2AlmadenSans-Regular-Web... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Regular-WebXL.woff2 — 65.6 KiB — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Medium-WebXL.woff2AlmadenSans-Medium-WebX... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Medium-WebXL.woff2 — 65.3 KiB — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/happy-face/HappyDisplay-SemiBold.woff2HappyDisplay-SemiBold.w... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/happy-face/HappyDisplay-SemiBold.woff2 — 30.5 KiB — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-SemiBold-WebXL.woff2AlmadenSans-SemiBold-We... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-SemiBold-WebXL.woff2 — 66.0 KiB — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Bold-WebXL.woff2AlmadenSans-Bold-WebXL.... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Bold-WebXL.woff2 — 66.5 KiB — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Regular-WebXL.woff2AlmadenSans-Regular-Web... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Regular-WebXL.woff2 — 0 B — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Medium-WebXL.woff2AlmadenSans-Medium-WebX... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Medium-WebXL.woff2 — 0 B — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-SemiBold-WebXL.woff2AlmadenSans-SemiBold-We... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-SemiBold-WebXL.woff2 — 0 B — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Bold-WebXL.woff2AlmadenSans-Bold-WebXL.... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/almaden-sans/AlmadenSans-Bold-WebXL.woff2 — 0 B — 0 ms — font-display: swaphttps://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/happy-face/HappyDisplay-SemiBold.woff2HappyDisplay-SemiBold.w... https://st1.zoom.us/homepage/20260407-0049/primary/dist/assets/fonts/happy-face/HappyDisplay-SemiBold.woff2 — 0 B — 0 ms — font-display: swap
AlmadenSans-Regular-Web... woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-Medium-WebX... woff2 swap
Size 65 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
HappyDisplay-SemiBold.w... woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-SemiBold-We... woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-Bold-WebXL.... woff2 swap
Size 67 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-Regular-Web... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-Medium-WebX... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-SemiBold-We... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AlmadenSans-Bold-WebXL.... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
HappyDisplay-SemiBold.w... woff2 swap
Size 0 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: public, max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
Last-Modified header present
Cache-Control

public, max-age=3600

DirectiveValueMeaning
public—Any cache may store this response
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
309 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
64% of JavaScript execution is third-party
First-party Third-party 6764ms · 407KB · $127/mo
Unattributable
Other
Costly
Execution 1684ms
Transfer 0 KB
Monthly Cost $32/mo
Google Tag Manager
Tag Manager
Costly
Execution 1005ms
Transfer 0 KB
Unused 36%
Monthly Cost $19/mo
st1.zoom.us
Other
Costly
Execution 750ms
Transfer 0 KB
Monthly Cost $14/mo
OneTrust
Consent
Essential
Execution 694ms
Transfer 0 KB
Unused 55%
Monthly Cost $13/mo
st1.zoom.us
Other
Costly
Execution 631ms
Transfer 0 KB
Monthly Cost $12/mo
us01ccistatic.zoom.us
Other
Costly
Execution 530ms
Transfer 302 KB
Unused 53%
Monthly Cost $10/mo
us01ccistatic.zoom.us
Other
Costly
Execution 364ms
Transfer 55 KB
Unused 42%
Monthly Cost $7/mo
st1.zoom.us
Other
Costly
Execution 253ms
Transfer 0 KB
Monthly Cost $5/mo
jsDelivr
CDN
Costly
Execution 237ms
Transfer 50 KB
Monthly Cost $4/mo
cdn.bc0a.com
Other
Costly
Execution 214ms
Transfer 0 KB
Monthly Cost $4/mo
st1.zoom.us
Other
Optional
Execution 134ms
Transfer 0 KB
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 130ms
Transfer 0 KB
Monthly Cost $2/mo
st1.zoom.us
Other
Optional
Execution 76ms
Transfer 0 KB
Monthly Cost $1/mo
st1.zoom.us
Other
Optional
Execution 63ms
Transfer 0 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1684ms and costs ~$32/month
  • Google Tag Manager adds 1005ms and costs ~$19/month
  • st1.zoom.us adds 750ms and costs ~$14/month
  • st1.zoom.us adds 631ms and costs ~$12/month
  • us01ccistatic.zoom.us adds 530ms and costs ~$10/month
  • us01ccistatic.zoom.us adds 364ms and costs ~$7/month
  • st1.zoom.us adds 253ms and costs ~$5/month
  • jsDelivr adds 237ms and costs ~$4/month
  • cdn.bc0a.com adds 214ms and costs ~$4/month

64% 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.

Learn more ▾

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

Unattributable takes 1684ms 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 1005ms 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

st1.zoom.us takes 750ms 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

55% of OneTrust'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

st1.zoom.us takes 631ms 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

us01ccistatic.zoom.us takes 530ms 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

53% of us01ccistatic.zoom.us'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

us01ccistatic.zoom.us takes 364ms 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

st1.zoom.us takes 253ms 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

jsDelivr takes 237ms 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.bc0a.com takes 214ms 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 st1.zoom.us'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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