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.
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
i
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
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
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.
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.
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
Image Optimization
12 images, 0 KB saveable
PASS
12 images, 0 KB saveable
Warning::
!
https://images.squarespace-cdn.com/content/v1/67cf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12images1.1 MB
0oversized-0 KB
1legacy format
1missing 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
A+
Font Loading
4 fonts (57 KB)
PASS
4 fonts (57 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
57 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
pxiByp8kv8JHgFVrLGT9Z1x...woff2swap
Size8 KB
Load time40 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x...woff2swap
Size8 KB
Load time42 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x...woff2swap
Size8 KB
Load time48 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time117 ms
Start2.7 s
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect
2
preload—
dns-prefetch—
prefetch—
2 resource hints configured
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 Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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 4.6 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.
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
81 requests over 2943ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100%of JavaScript execution is third-party
First-party Third-party4558ms · 1054KB · $26/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
assets.squarespace.com
assets.squarespace.com
Other
1583ms
274 KB
64%
$9/mo
Costly
www.printxpressgp.com
www.printxpressgp.com
Other
736ms
47 KB
—
$4/mo
Costly
assets.squarespace.com
assets.squarespace.com
Other
620ms
15 KB
—
$4/mo
Costly
static1.squarespace.com
static1.squarespace.com
Other
366ms
37 KB
—
$2/mo
Costly
Unattributable
Unattributable
Other
361ms
0 KB
—
$2/mo
Costly
www.gstatic.com
www.gstatic.com
Other
206ms
0 KB
48%
$1/mo
Costly
assets.squarespace.com
assets.squarespace.com
Other
172ms
17 KB
—
$1/mo
Optional
assets.squarespace.com
assets.squarespace.com
Other
131ms
42 KB
—
$1/mo
Optional
assets.squarespace.com
assets.squarespace.com
Other
121ms
188 KB
82%
$1/mo
Optional
assets.squarespace.com
assets.squarespace.com
Other
82ms
96 KB
81%
$0/mo
Optional
assets.squarespace.com
assets.squarespace.com
Other
62ms
60 KB
98%
$0/mo
Optional
assets.squarespace.com
assets.squarespace.com
Other
58ms
168 KB
35%
$0/mo
Optional
static1.squarespace.com
static1.squarespace.com
Other
58ms
108 KB
—
$0/mo
Optional
assets.squarespace.com
Other
Costly
Execution1583ms
Transfer274 KB
Unused64%
Monthly Cost$9/mo
www.printxpressgp.com
Other
Costly
Execution736ms
Transfer47 KB
Monthly Cost$4/mo
assets.squarespace.com
Other
Costly
Execution620ms
Transfer15 KB
Monthly Cost$4/mo
static1.squarespace.com
Other
Costly
Execution366ms
Transfer37 KB
Monthly Cost$2/mo
Unattributable
Other
Costly
Execution361ms
Transfer0 KB
Monthly Cost$2/mo
www.gstatic.com
Other
Costly
Execution206ms
Transfer0 KB
Unused48%
Monthly Cost$1/mo
assets.squarespace.com
Other
Optional
Execution172ms
Transfer17 KB
Monthly Cost$1/mo
assets.squarespace.com
Other
Optional
Execution131ms
Transfer42 KB
Monthly Cost$1/mo
assets.squarespace.com
Other
Optional
Execution121ms
Transfer188 KB
Unused82%
Monthly Cost$1/mo
assets.squarespace.com
Other
Optional
Execution82ms
Transfer96 KB
Unused81%
Monthly Cost$0/mo
assets.squarespace.com
Other
Optional
Execution62ms
Transfer60 KB
Unused98%
Monthly Cost$0/mo
assets.squarespace.com
Other
Optional
Execution58ms
Transfer168 KB
Unused35%
Monthly Cost$0/mo
static1.squarespace.com
Other
Optional
Execution58ms
Transfer108 KB
Monthly Cost$0/mo
These scripts may cost more than they're worth
assets.squarespace.com adds 1583ms and costs ~$9/month
www.printxpressgp.com adds 736ms and costs ~$4/month
assets.squarespace.com adds 620ms and costs ~$4/month
static1.squarespace.com adds 366ms and costs ~$2/month
Unattributable adds 361ms and costs ~$2/month
www.gstatic.com adds 206ms and costs ~$1/month
100% 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
assets.squarespace.com takes 1583ms 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 assets.squarespace.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
www.printxpressgp.com takes 736ms 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
assets.squarespace.com takes 620ms 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
static1.squarespace.com takes 366ms 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
Unattributable takes 361ms 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.gstatic.com 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
82% of assets.squarespace.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
81% of assets.squarespace.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
98% of assets.squarespace.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.