Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Image Optimization
Action
73 images, 0 KB saveable
REVIEW
73 images, 0 KB saveable
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... 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://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://once-upon-a-book-club.myshopify.com/cdn/sh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
73images4.3 MB
0oversized-0 KB
5legacy format
54missing dimensionsCLS 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
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
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
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
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
i
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
A
Third-Party Impact
33% third-party, 0 ms blocking
PASS
33% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 33% of page weight (2.7 MiB of 8.1 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
67%
33%
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
7 fonts (112 KB)
PASS
7 fonts (112 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
112 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time128 ms
Start917 ms
RiskFOUT — text flashes from fallback to web font
outfit_n3.8c97ae4c4fac7...woff2swap
Size15 KB
Load time48 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
tenorsans_n4.966071a72c...woff2swap
Size25 KB
Load time49 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
outfit_n6.dfcbaa8018785...woff2swap
Size15 KB
Load time51 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
x-font-woff;charset=utf...woffswap
Size1 KB
Load time457 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
bx6ANxqUneKx06UkIXISn3V...woff2swap
Size10 KB
Load time32 ms
Start2.4 s
RiskFOUT — text flashes from fallback to web font
f8cef3fb44145ec4.woffwoffswap
Size11 KB
Load time174 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
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 ~4 KB and ~8 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/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
✓
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
✓
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A+
Server-Timing Observability
1 Server-Timing entries advertised
PASS
1 Server-Timing entries advertised
Info::
✓
Server-Timing header advertises 1 timing entries
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
!
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
!
Total JS execution time is 17.2 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
✓
No CSS performance depth issues 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
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
i
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
368 requests over 8191ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
35%of JavaScript execution is third-party
First-party Third-party5967ms · 982KB · $34/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
ajax.googleapis.com
ajax.googleapis.com
Other
1891ms
31 KB
—
$11/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
903ms
26 KB
—
$5/mo
Costly
cdn.shopify.com
cdn.shopify.com
Other
519ms
45 KB
—
$3/mo
Costly
cdn.shopify.com
cdn.shopify.com
Other
497ms
24 KB
—
$3/mo
Costly
cdn.shopify.com
cdn.shopify.com
Other
304ms
0 KB
77%
$2/mo
Costly
static.rechargecdn.com
static.rechargecdn.com
Other
263ms
122 KB
64%
$2/mo
Costly
cdn.shopify.com
cdn.shopify.com
Other
227ms
323 KB
72%
$1/mo
Costly
static.rechargecdn.com
static.rechargecdn.com
Other
209ms
169 KB
81%
$1/mo
Costly
cdn.accessibly.app
cdn.accessibly.app
Other
151ms
0 KB
—
$1/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
148ms
0 KB
56%
$1/mo
Optional
cdn.accessibly.app
cdn.accessibly.app
Other
144ms
41 KB
—
$1/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
110ms
107 KB
78%
$1/mo
Optional
cdn.accessibly.app
cdn.accessibly.app
Other
99ms
1 KB
—
$1/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
84ms
16 KB
—
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
78ms
18 KB
—
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
76ms
1 KB
—
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
71ms
37 KB
60%
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
67ms
4 KB
—
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
65ms
14 KB
—
$0/mo
Optional
cdn.shopify.com
cdn.shopify.com
Other
61ms
3 KB
—
$0/mo
Optional
ajax.googleapis.com
Other
Costly
Execution1891ms
Transfer31 KB
Monthly Cost$11/mo
Microsoft Clarity
Session Replay
Costly
Execution903ms
Transfer26 KB
Monthly Cost$5/mo
cdn.shopify.com
Other
Costly
Execution519ms
Transfer45 KB
Monthly Cost$3/mo
cdn.shopify.com
Other
Costly
Execution497ms
Transfer24 KB
Monthly Cost$3/mo
cdn.shopify.com
Other
Costly
Execution304ms
Transfer0 KB
Unused77%
Monthly Cost$2/mo
static.rechargecdn.com
Other
Costly
Execution263ms
Transfer122 KB
Unused64%
Monthly Cost$2/mo
cdn.shopify.com
Other
Costly
Execution227ms
Transfer323 KB
Unused72%
Monthly Cost$1/mo
static.rechargecdn.com
Other
Costly
Execution209ms
Transfer169 KB
Unused81%
Monthly Cost$1/mo
cdn.accessibly.app
Other
Optional
Execution151ms
Transfer0 KB
Monthly Cost$1/mo
cdn.shopify.com
Other
Optional
Execution148ms
Transfer0 KB
Unused56%
Monthly Cost$1/mo
cdn.accessibly.app
Other
Optional
Execution144ms
Transfer41 KB
Monthly Cost$1/mo
cdn.shopify.com
Other
Optional
Execution110ms
Transfer107 KB
Unused78%
Monthly Cost$1/mo
cdn.accessibly.app
Other
Optional
Execution99ms
Transfer1 KB
Monthly Cost$1/mo
cdn.shopify.com
Other
Optional
Execution84ms
Transfer16 KB
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution78ms
Transfer18 KB
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution76ms
Transfer1 KB
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution71ms
Transfer37 KB
Unused60%
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution67ms
Transfer4 KB
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution65ms
Transfer14 KB
Monthly Cost$0/mo
cdn.shopify.com
Other
Optional
Execution61ms
Transfer3 KB
Monthly Cost$0/mo
These scripts may cost more than they're worth
ajax.googleapis.com adds 1891ms and costs ~$11/month
Microsoft Clarity adds 903ms and costs ~$5/month
cdn.shopify.com adds 519ms and costs ~$3/month
cdn.shopify.com adds 497ms and costs ~$3/month
cdn.shopify.com adds 304ms and costs ~$2/month
static.rechargecdn.com adds 263ms and costs ~$2/month
cdn.shopify.com adds 227ms and costs ~$1/month
static.rechargecdn.com adds 209ms and costs ~$1/month
ajax.googleapis.com takes 1891ms 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
Microsoft Clarity takes 903ms 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 519ms 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 497ms 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 304ms 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
77% 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
static.rechargecdn.com takes 263ms 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 static.rechargecdn.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 227ms 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
72% 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
static.rechargecdn.com takes 209ms 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
81% of static.rechargecdn.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
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
78% 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
60% 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.
906 ms
2.7 s
3.6 s
4.5 s
5.4 s
7.2 s