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
Image Optimization
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
!
https://static.rollercoin.com/static/img/ref/gen2/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31images662 KB
0oversized-0 KB
29legacy 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
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.
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
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
!
6 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 3.5 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
6 fonts (558 KB)
PASS
6 fonts (558 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
558 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
woff2;base64,d09GMgABAA...woff2swap
Size9 KB
Load time60 ms
Start526 ms
RiskFOUT — text flashes from fallback to web font
cousine_normal_400.ttfttfswap
Size163 KB
Load time21 ms
Start573 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pixeloid-sans_normal_70...otfswap
Size37 KB
Load time22 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
cousine_italic_400.ttfttfswap
Size151 KB
Load time26 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pixeloid-sans_normal_40...otfswap
Size40 KB
Load time17 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
cousine_normal_700.ttfttfswap
Size158 KB
Load time27 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~401 KB and ~802 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
✓
Page uses 6 resource hint(s)
Current Resource Hints
preconnect—
preload
3
dns-prefetch
3
prefetch—
6 resource hints configured
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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
✓
0.gravatar.com serves assets with brotli (assets: 4)
Got: 0.gravatar.com (text/css)
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
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
✓
Server-Timing header advertises 3 timing entries
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
✓
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
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.
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
94 requests over 1805ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50%of JavaScript execution is third-party
First-party Third-party1763ms · 780KB · $23/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
dn0qt3r0xannq.cloudfront.net
dn0qt3r0xannq.cloudfront.net
Other
348ms
116 KB
52%
$5/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
233ms
215 KB
75%
$3/mo
Costly
edge.aditude.io
edge.aditude.io
Other
231ms
161 KB
76%
$3/mo
Costly
raven-static.aditude.io
raven-static.aditude.io
Other
229ms
105 KB
61%
$3/mo
Costly
c.amazon-adsystem.com
c.amazon-adsystem.com
Other
204ms
93 KB
58%
$3/mo
Costly
s0.wp.com
s0.wp.com
Other
139ms
8 KB
—
$2/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
115ms
39 KB
—
$2/mo
Optional
stats.wp.com
stats.wp.com
Other
83ms
7 KB
—
$1/mo
Optional
dn0qt3r0xannq.cloudfront.net
dn0qt3r0xannq.cloudfront.net
Other
75ms
13 KB
—
$1/mo
Optional
s0.wp.com
s0.wp.com
Other
55ms
8 KB
—
$1/mo
Optional
Google Analytics
ssl.google-analytics.com
Analytics
51ms
17 KB
—
$1/mo
Optional
dn0qt3r0xannq.cloudfront.net
Other
Costly
Execution348ms
Transfer116 KB
Unused52%
Monthly Cost$5/mo
securepubads.g.doubleclick.net
Other
Costly
Execution233ms
Transfer215 KB
Unused75%
Monthly Cost$3/mo
edge.aditude.io
Other
Costly
Execution231ms
Transfer161 KB
Unused76%
Monthly Cost$3/mo
raven-static.aditude.io
Other
Costly
Execution229ms
Transfer105 KB
Unused61%
Monthly Cost$3/mo
c.amazon-adsystem.com
Other
Costly
Execution204ms
Transfer93 KB
Unused58%
Monthly Cost$3/mo
s0.wp.com
Other
Optional
Execution139ms
Transfer8 KB
Monthly Cost$2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution115ms
Transfer39 KB
Monthly Cost$2/mo
stats.wp.com
Other
Optional
Execution83ms
Transfer7 KB
Monthly Cost$1/mo
dn0qt3r0xannq.cloudfront.net
Other
Optional
Execution75ms
Transfer13 KB
Monthly Cost$1/mo
s0.wp.com
Other
Optional
Execution55ms
Transfer8 KB
Monthly Cost$1/mo
Google Analytics
Analytics
Optional
Execution51ms
Transfer17 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
dn0qt3r0xannq.cloudfront.net adds 348ms and costs ~$5/month
securepubads.g.doubleclick.net adds 233ms and costs ~$3/month
edge.aditude.io adds 231ms and costs ~$3/month
raven-static.aditude.io adds 229ms and costs ~$3/month
c.amazon-adsystem.com adds 204ms and costs ~$3/month
50% 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
dn0qt3r0xannq.cloudfront.net takes 348ms 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 dn0qt3r0xannq.cloudfront.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
securepubads.g.doubleclick.net takes 233ms 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
75% of securepubads.g.doubleclick.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
edge.aditude.io takes 231ms 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
76% of edge.aditude.io'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
raven-static.aditude.io takes 229ms 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
61% of raven-static.aditude.io'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
c.amazon-adsystem.com takes 204ms 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
58% of c.amazon-adsystem.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.