Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.53 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.74 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
368 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.007
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.34 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.
13.83 s
Page Load Progression
DThird-Party ImpactAction92% third-party, 0 ms blockingFIX
DJS Execution CostAction2731ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://acuityscheduling.com/ | 832ms | 20ms | 9ms | 1st |
| Unattributable | 564ms | 30ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5G77WWT | 289ms | 233ms | 41ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-725208829&cx=c>m=4e64h1 | 203ms | 171ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9658484&cx=c>m=4e64h1 | 142ms | 115ms | 25ms | 3rd |
| https://www.datadoghq-browser-agent.com/us5/v5/datadog-rum.js | 119ms | 94ms | 13ms | 3rd |
| https://connect.facebook.net/signals/config/1407587539516826?v=2.9.303&r=stable&domain=acuityscheduling.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168%2C228%2C227%2C222%2C224%2C225%2C226%2C223%2C211%2C221%2C193%2C190%2C191%2C185%2C189%2C192%2C188%2C183%2C316%2C196%2C215%2C184%2C182%2C235%2C206%2C176%2C177%2C172%2C178%2C175%2C173%2C174%2C171%2C169%2C180%2C181%2C179%2C265%2C315%2C194%2C238%2C239%2C244%2C241%2C243%2C242%2C240%2C237%2C252%2C248%2C249%2C247%2C253%2C250%2C246%2C251%2C245 | 109ms | 98ms | 8ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 98ms | 71ms | 26ms | 3rd |
| https://cdn-marketing.acuityscheduling.com/js/marketing.bundle.js?v=2673d6dc83c8476a61aef93a302a69603aca19d6 | 93ms | 65ms | 19ms | 3rd |
| https://s.pinimg.com/ct/lib/main.10d2511a.js | 83ms | 67ms | 12ms | 3rd |
Showing top 10 of 13 scripts
DPage Weight InventoryAction91 resources · 1.8 MB · 285 KB savings availableFIX
~285.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 91 resources | 1.8 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store, no-cache, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
CPage Weight BudgetAction1.8 MB transferred, 91 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
CImage OptimizationAction58 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
CJS BundlesAction17 scripts, 285 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/destination?id=AW-725208829&cx=c>m=4e64h1 | 145 KB | 66 KB (46%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9658484&cx=c>m=4e64h1 | 131 KB | 66 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5G77WWT | 161 KB | 65 KB (41%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 33 KB (34%) | ✓ | 3rd |
| https://www.datadoghq-browser-agent.com/us5/v5/datadog-rum.js | 52 KB | 30 KB (58%) | ✓ | 3rd |
| https://cdn-marketing.acuityscheduling.com/js/marketing.bundle.js?v=2673d6dc83c8476a61aef93a302a69603aca19d6 | 61 KB | 25 KB (41%) | ✓ | 3rd |
| https://www.datadoghq-browser-agent.com/us5/v5/datadog-logs.js | 20 KB | — | ✓ | 3rd |
| https://acuityscheduling.com/js/dropdown.js | 1 KB | — | ✓ | 1st |
| https://cdn.amplitude.com/libs/amplitude-8.9.0-min.gz.js | 23 KB | — | ✓ | 3rd |
| https://consent.trustarc.com/notice?domain=squarespace.com&c=teconsent&js=nj¬iceType=bb&text=true&pn=2>m=1&pcookie | 13 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (267 KB)PASS
Web fonts
5
267 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall91 requests over 4721msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 564ms | 0 KB | — | €6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 289ms | 161 KB | 41% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 203ms | 145 KB | 46% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 142ms | 131 KB | 50% | €2/mo | Optional |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 119ms | 52 KB | 58% | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 109ms | 19 KB | — | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 98ms | 97 KB | 34% | €1/mo | Optional |
cdn-marketing.acuityscheduling.com cdn-marketing.acuityscheduling.com | Other | 93ms | 61 KB | 41% | €1/mo | Optional |
s.pinimg.com s.pinimg.com | Other | 83ms | 27 KB | — | €1/mo | Optional |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 75ms | 20 KB | — | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 70ms | 45 KB | — | €1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 54ms | 23 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 564ms and costs ~€6/month
- Google Tag Manager adds 289ms and costs ~€3/month
- Google Tag Manager adds 203ms and costs ~€2/month
70% of JavaScript execution time comes from third-party scripts.
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 564ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 289ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 203ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
58% of www.datadoghq-browser-agent.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev