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https://www.amplitude.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
3
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.
90
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.
85
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.

3.45 s

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

27.45 s

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

2.66 s

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

0.004

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

14.31 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.

38.20 s

Page Load Progression

602 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
16
8 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
7.8 MB transferred, 241 requests
FIX
7.8 MB transferred, 241 requests
Critical::
Page weighs 16.3 MB (7.8 MB transferred)
Warning::
Images are 5.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.0 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
Fonts are 248 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 248 KB
Warning::
241 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.6 g CO2 per page load
7.8 MB / 2.4 MB budget
7.8 MB transferred
241 requests
1.6 g CO2 per page load
Images 5.0 MiB 64%
JavaScript 2.4 MiB 31%
Fonts 248.4 KiB 3%
Other 63.0 KiB 1%
HTML 42.0 KiB 1%
CSS 37.5 KiB 0%
Other 7.3 KiB 0%
Other 6.1 KiB 0%
Other 936 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

F
JS Execution Cost
Action
15392ms total JS execution
FIX
15392ms total JS execution
Warning::
https://www.amplitude.com/_next/static/chunks/page...: 3001ms CPU time
Warning::
Unattributable: 2217ms CPU time
Warning::
https://fast.wistia.net/assets/external/E-v1.js: 2155ms CPU time
Warning::
https://www.amplitude.com/: 1840ms CPU time
Warning::
https://www.amplitude.com/_next/static/chunks/fram...: 1172ms CPU time
Warning::
Third-party scripts: 7937ms (52% of total)

Main Thread Breakdown

Script Evaluation 63% Other 21% Style & Layout 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.amplitude.com/_next/static/chunks/pages/_app-7eea1b37d0ebcc42.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw3001ms2243ms113ms1st
Unattributable2217ms510ms0ms3rd
https://fast.wistia.net/assets/external/E-v1.js2155ms1637ms84ms3rd
https://www.amplitude.com/1840ms38ms2ms1st
https://www.amplitude.com/_next/static/chunks/framework-fce8e21f27fd62d5.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw1172ms1108ms28ms1st
https://client-registry.mutinycdn.com/mutiny-client/223.5.6.3.js834ms559ms14ms3rd
https://www.amplitude.com/_next/static/chunks/main-0e18efe88c308975.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw724ms521ms27ms1st
https://cdn.amplitude.com/script/e3e918f274fa30555c627abdb29840d5.experiment.js552ms475ms61ms3rd
https://www.amplitude.com/_next/static/chunks/ec7a46bc.b28b10e61865396a.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw425ms403ms17ms1st
https://ob.roundprincemusic.com/i/8356b7ffc20afc0a5275c6176232dc10.js420ms351ms12ms3rd

Showing top 10 of 22 scripts

F
JS Bundles
Action
87 scripts, 904 KB unused
FIX
87 scripts, 904 KB unused
Warning::
https://www.amplitude.com/_next/static/chunks/page...: 166 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.net/assets/external/engines/hl...: 97 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T6J...: 86 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.amplitude.com/engagement-browser/prod/...: 84 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.net/assets/external/E-v1.js: 71 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 904 KB
904 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.amplitude.com/_next/static/chunks/pages/_app-7eea1b37d0ebcc42.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw336 KB166 KB (49%)✓1st
https://fast.wistia.net/assets/external/engines/hls_video.js@49b80af9d2806884c566f240cb7a5b25caa013f7159 KB97 KB (77%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T6JXPP5173 KB86 KB (50%)✓3rd
https://cdn.amplitude.com/engagement-browser/prod/split/df9b61a9061fbc33ed8e6b620d00ea2d64efb94f-chunk-7V35RKKP.js168 KB84 KB (50%)✓3rd
https://fast.wistia.net/assets/external/E-v1.js162 KB71 KB (44%)✓3rd
https://www.amplitude.com/_next/static/chunks/7d767c4f-975344b1029233a3.js?dpl=dpl_CNAx5ojJ92fNRGQzyqyxV2P745Sw78 KB68 KB (87%)✓1st
https://www.googletagmanager.com/gtag/js?id=AW-736707024&cx=c&gtm=4e6460146 KB63 KB (43%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB58 KB (47%)✓3rd
https://cdn.amplitude.com/engagement-browser/prod/split/df9b61a9061fbc33ed8e6b620d00ea2d64efb94f-chunk-WO7XXSIO.js65 KB48 KB (74%)✓3rd
https://assets.adoberesources.net/builds/9f3ebe7d468ed39ab91c3bfd3f7de0214e72e953/dist/core-ui/src/index.js51 KB40 KB (79%)✓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
51 images, 0 KB saveable
REVIEW
51 images, 0 KB saveable
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.sanity.io/images/l5rq9j6r/production/4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
51 images 5.0 MB
0 oversized -0 KB
29 legacy format
8 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

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

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A
Third-Party Impact
40% third-party, 0 ms blocking
PASS
40% third-party, 0 ms blocking
Info::
Third-party code accounts for 40% of page weight (3.1 MiB of 7.8 MiB)
Info::
Third-party blocking time is low (0 ms)
60%
40%
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
5 fonts (248 KB)
PASS
5 fonts (248 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

248 KB total

Render-blocking

0

of 5

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 3.5 s LCP 27.5 shttps://fonts.cdnfonts.com/s/29655/GellixBold.woffGellixBold.woff https://fonts.cdnfonts.com/s/29655/GellixBold.woff — 53.0 KiB — 0 ms — font-display: swaphttps://fonts.cdnfonts.com/s/29655/GellixMedium.woffGellixMedium.woff https://fonts.cdnfonts.com/s/29655/GellixMedium.woff — 51.8 KiB — 0 ms — font-display: swaphttps://fonts.cdnfonts.com/s/29655/GellixSemiBold.woffGellixSemiBold.woff https://fonts.cdnfonts.com/s/29655/GellixSemiBold.woff — 52.3 KiB — 0 ms — font-display: swaphttps://fonts.cdnfonts.com/s/29655/GellixRegular.woffGellixRegular.woff https://fonts.cdnfonts.com/s/29655/GellixRegular.woff — 51.8 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2zYXzKVElMYYaJe8bpLHnCwD... https://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2 — 39.3 KiB — 0 ms — font-display: swap
GellixBold.woff woff swap
Size 53 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GellixMedium.woff woff swap
Size 52 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GellixSemiBold.woff woff swap
Size 52 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GellixRegular.woff woff swap
Size 52 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 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)

Fixing the unchecked items could save ~63 KB and ~126 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 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
Network Waterfall
241 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
52% of JavaScript execution is third-party
First-party Third-party 7937ms · 1074KB · €86/mo
Unattributable
Other
Costly
Execution 2217ms
Transfer 0 KB
Monthly Cost €24/mo
fast.wistia.net
Other
Costly
Execution 2155ms
Transfer 162 KB
Unused 44%
Monthly Cost €23/mo
client-registry.mutinycdn.com
Other
Costly
Execution 834ms
Transfer 33 KB
Monthly Cost €9/mo
Amplitude
Analytics
Costly
Execution 552ms
Transfer 134 KB
Monthly Cost €6/mo
ob.roundprincemusic.com
Other
Costly
Execution 420ms
Transfer 45 KB
Monthly Cost €5/mo
obs.roundprincemusic.com
Other
Costly
Execution 307ms
Transfer 2 KB
Monthly Cost €3/mo
fast.wistia.net
Other
Costly
Execution 210ms
Transfer 43 KB
Unused 67%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 206ms
Transfer 146 KB
Unused 43%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 189ms
Transfer 173 KB
Unused 50%
Monthly Cost €2/mo
fast.wistia.net
Other
Optional
Execution 188ms
Transfer 42 KB
Unused 62%
Monthly Cost €2/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 180ms
Transfer 123 KB
Unused 47%
Monthly Cost €2/mo
assets.adoberesources.net
Other
Optional
Execution 133ms
Transfer 49 KB
Monthly Cost €1/mo
client-registry.mutinycdn.com
Other
Optional
Execution 100ms
Transfer 20 KB
Monthly Cost €1/mo
Amplitude
Analytics
Optional
Execution 98ms
Transfer 40 KB
Unused 51%
Monthly Cost €1/mo
client-registry.mutinycdn.com
Other
Optional
Execution 92ms
Transfer 11 KB
Monthly Cost €1/mo
assets.adoberesources.net
Other
Optional
Execution 58ms
Transfer 51 KB
Unused 79%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2217ms and costs ~€24/month
  • fast.wistia.net adds 2155ms and costs ~€23/month
  • client-registry.mutinycdn.com adds 834ms and costs ~€9/month
  • Amplitude adds 552ms and costs ~€6/month
  • ob.roundprincemusic.com adds 420ms and costs ~€5/month
  • obs.roundprincemusic.com adds 307ms and costs ~€3/month
  • fast.wistia.net adds 210ms and costs ~€2/month
  • Google Tag Manager adds 206ms and costs ~€2/month

52% 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 2217ms 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

fast.wistia.net takes 2155ms 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

client-registry.mutinycdn.com takes 834ms 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

Amplitude takes 552ms 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

ob.roundprincemusic.com takes 420ms 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

obs.roundprincemusic.com takes 307ms 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

fast.wistia.net takes 210ms 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 fast.wistia.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

Google Tag Manager takes 206ms 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

62% of fast.wistia.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

51% of Amplitude'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

79% of assets.adoberesources.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

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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