Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
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
C
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
!
https://magicandcards.com/product_images/uploaded_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn11.bigcommerce.com/s-s49ybz9mpf/lib/fla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/images/stencil/original/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/product_images/uploaded_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/images/stencil/original/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/product_images/uploaded_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/images/stencil/original/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://magicandcards.com/images/stencil/original/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42images1.3 MB
0oversized-0 KB
15legacy format
8missing 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
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
i
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
!
2 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
!
Total JS execution time is 7.3 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.
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
4 fonts (169 KB)
PASS
4 fonts (169 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
169 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
iJWEBXyIfDnIV7nEnX661E_...woff2swap
Size36 KB
Load time21 ms
Start920 ms
RiskFOUT — text flashes from fallback to web font
92zatBhPNqw73oTd4jQmfxI...woff2swap
Size26 KB
Load time22 ms
Start920 ms
RiskFOUT — text flashes from fallback to web font
iJWKBXyIfDnIV7nBrXyw023...woff2swap
Size35 KB
Load time24 ms
Start921 ms
RiskFOUT — text flashes from fallback to web font
Wnz6HAc5bAfYB2Q7ZjYYiAz...woff2swap
Size73 KB
Load time12 ms
Start984 ms
RiskFOUT — 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
✓
Page uses 1 resource hint(s)
Current Resource Hints
preconnect
1
preload—
dns-prefetch—
prefetch—
1 resource hints configured
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+
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+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
✓
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store, no-cache, must-revalidate
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
98 requests over 4852ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75%of JavaScript execution is third-party
First-party Third-party5532ms · 1025KB · $32/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cdn11.bigcommerce.com
cdn11.bigcommerce.com
Other
1004ms
135 KB
52%
$6/mo
Costly
Unattributable
Unattributable
Other
801ms
0 KB
—
$5/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
760ms
97 KB
36%
$4/mo
Costly
www.redditstatic.com
www.redditstatic.com
Other
481ms
19 KB
—
$3/mo
Costly
mc.yandex.ru
mc.yandex.ru
Other
427ms
86 KB
50%
$2/mo
Costly
cdn11.bigcommerce.com
cdn11.bigcommerce.com
Other
364ms
4 KB
—
$2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
362ms
145 KB
39%
$2/mo
Costly
analytics.tiktok.com
analytics.tiktok.com
Other
332ms
121 KB
51%
$2/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
291ms
25 KB
—
$2/mo
Costly
checkout-sdk.bigcommerce.com
checkout-sdk.bigcommerce.com
Other
197ms
38 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
148ms
158 KB
41%
$1/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
117ms
45 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
111ms
112 KB
64%
$1/mo
Optional
cdn11.bigcommerce.com
cdn11.bigcommerce.com
Other
73ms
2 KB
—
$0/mo
Optional
analytics.tiktok.com
analytics.tiktok.com
Other
65ms
40 KB
—
$0/mo
Optional
cdn11.bigcommerce.com
Other
Costly
Execution1004ms
Transfer135 KB
Unused52%
Monthly Cost$6/mo
Unattributable
Other
Costly
Execution801ms
Transfer0 KB
Monthly Cost$5/mo
Facebook Pixel
Advertising
Costly
Execution760ms
Transfer97 KB
Unused36%
Monthly Cost$4/mo
www.redditstatic.com
Other
Costly
Execution481ms
Transfer19 KB
Monthly Cost$3/mo
mc.yandex.ru
Other
Costly
Execution427ms
Transfer86 KB
Unused50%
Monthly Cost$2/mo
cdn11.bigcommerce.com
Other
Costly
Execution364ms
Transfer4 KB
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Costly
Execution362ms
Transfer145 KB
Unused39%
Monthly Cost$2/mo
analytics.tiktok.com
Other
Costly
Execution332ms
Transfer121 KB
Unused51%
Monthly Cost$2/mo
Microsoft Clarity
Session Replay
Costly
Execution291ms
Transfer25 KB
Monthly Cost$2/mo
checkout-sdk.bigcommerce.com
Other
Optional
Execution197ms
Transfer38 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution148ms
Transfer158 KB
Unused41%
Monthly Cost$1/mo
Facebook Pixel
Advertising
Optional
Execution117ms
Transfer45 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution111ms
Transfer112 KB
Unused64%
Monthly Cost$1/mo
cdn11.bigcommerce.com
Other
Optional
Execution73ms
Transfer2 KB
Monthly Cost$0/mo
analytics.tiktok.com
Other
Optional
Execution65ms
Transfer40 KB
Monthly Cost$0/mo
These scripts may cost more than they're worth
cdn11.bigcommerce.com adds 1004ms and costs ~$6/month
Unattributable adds 801ms and costs ~$5/month
Facebook Pixel adds 760ms and costs ~$4/month
www.redditstatic.com adds 481ms and costs ~$3/month
mc.yandex.ru adds 427ms and costs ~$2/month
cdn11.bigcommerce.com adds 364ms and costs ~$2/month
Google Tag Manager adds 362ms and costs ~$2/month
analytics.tiktok.com adds 332ms and costs ~$2/month
Microsoft Clarity adds 291ms and costs ~$2/month
75% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
Why this matters
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
cdn11.bigcommerce.com takes 1004ms 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
52% of cdn11.bigcommerce.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
Unattributable takes 801ms 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
Facebook Pixel takes 760ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.redditstatic.com takes 481ms 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
mc.yandex.ru takes 427ms 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
cdn11.bigcommerce.com 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
Google Tag Manager takes 362ms 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
analytics.tiktok.com takes 332ms 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
51% of analytics.tiktok.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
Microsoft Clarity takes 291ms 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 Google Tag Manager'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.