JavaScript is 890 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 890 KB
Info::
i
73 HTTP requests
Info::
i
Estimated 0.28 g CO2 per page load
1.3 MBtransferred
73 requests
0.28 g CO2 per page load
JavaScript889.9 KiB66%
Fonts154.8 KiB11%
Images115.9 KiB9%
HTML106.6 KiB8%
CSS69.1 KiB5%
Other11.3 KiB1%
Other311 B0%
Other61 B0%
Other0 B0%
02.4 MB4.9 MB
Under budget
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
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
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.
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.
Warning::
!
5 `@font-face` rule(s) without `font-display` -- causes FOIT
An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
155 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
nuFiD-vYSZviVYUb_rj3ij_...woff2swap
Size38 KB
Load time69 ms
Start167 ms
RiskFOUT — text flashes from fallback to web font
InstrumentSans-Regular-...ttfswap
Size34 KB
Load time445 ms
Start206 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
InstrumentSans-Medium-f...ttfswap
Size35 KB
Load time442 ms
Start738 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
truetype;base64,AAEAAAA...unknownswap
Size2 KB
Load time15 ms
Start3.0 s
RiskFOUT — text flashes from fallback to web font
Jqz55SSPQuCQF3t8uOwiUL-...woff2swap
Size46 KB
Load time115 ms
Start3.0 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)
Fixing the unchecked items could save ~21 KB and ~42 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
i
1 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://irp.cdn-website.com (preconnect+preconnect).
Info::
✓
Page uses 3 resource hint(s)
Current Resource Hints
preconnect
3
preload—
dns-prefetch—
prefetch—
3 resource hints configured
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://irp.cdn-website.com (preconnect+preconnect).
Why this matters
Performance issues directly impact user engagement and conversion rates.
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
1 of 3 asset hosts still on gzip
PASS
1 of 3 asset hosts still on gzip
Info::
✓
irp.cdn-website.com serves assets with brotli (assets: 16)
Got: irp.cdn-website.com (text/css)
Info::
✓
wsv3cdn.audioeye.com serves assets with brotli (assets: 7)
Got: wsv3cdn.audioeye.com (text/css)
Info::
i
static.cdn-website.com serves assets with gzip; brotli would be ~20% smaller (assets: 3)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: static.cdn-website.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+
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
✓
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
✓
`Vary` header declared: User-Agent
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::
✓
`ETag` present -- conditional GET supported
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 6.1 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.
Network Waterfall
73 requests over 5459ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
70%of JavaScript execution is third-party
First-party Third-party4286ms · 441KB · $57/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
wsv3cdn.audioeye.com
wsv3cdn.audioeye.com
Other
3265ms
108 KB
37%
$43/mo
Costly
static.cdn-website.com
static.cdn-website.com
Other
264ms
101 KB
68%
$4/mo
Costly
static.cdn-website.com
static.cdn-website.com
Other
203ms
15 KB
—
$3/mo
Costly
wsv3cdn.audioeye.com
wsv3cdn.audioeye.com
Other
180ms
119 KB
55%
$2/mo
Optional
d32hwlnfiv2gyn.cloudfront.net
d32hwlnfiv2gyn.cloudfront.net
Other
117ms
18 KB
—
$2/mo
Optional
ms-cdn.multiscreensite.com
ms-cdn.multiscreensite.com
Other
114ms
44 KB
—
$2/mo
Optional
static.cdn-website.com
static.cdn-website.com
Other
79ms
20 KB
—
$1/mo
Optional
wsv3cdn.audioeye.com
wsv3cdn.audioeye.com
Other
64ms
15 KB
—
$1/mo
Optional
wsv3cdn.audioeye.com
Other
Costly
Execution3265ms
Transfer108 KB
Unused37%
Monthly Cost$43/mo
static.cdn-website.com
Other
Costly
Execution264ms
Transfer101 KB
Unused68%
Monthly Cost$4/mo
static.cdn-website.com
Other
Costly
Execution203ms
Transfer15 KB
Monthly Cost$3/mo
wsv3cdn.audioeye.com
Other
Optional
Execution180ms
Transfer119 KB
Unused55%
Monthly Cost$2/mo
d32hwlnfiv2gyn.cloudfront.net
Other
Optional
Execution117ms
Transfer18 KB
Monthly Cost$2/mo
ms-cdn.multiscreensite.com
Other
Optional
Execution114ms
Transfer44 KB
Monthly Cost$2/mo
static.cdn-website.com
Other
Optional
Execution79ms
Transfer20 KB
Monthly Cost$1/mo
wsv3cdn.audioeye.com
Other
Optional
Execution64ms
Transfer15 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
wsv3cdn.audioeye.com adds 3265ms and costs ~$43/month
static.cdn-website.com adds 264ms and costs ~$4/month
static.cdn-website.com adds 203ms and costs ~$3/month
70% 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
wsv3cdn.audioeye.com takes 3265ms 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
static.cdn-website.com takes 264ms 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
68% of static.cdn-website.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.cdn-website.com takes 203ms 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
55% of wsv3cdn.audioeye.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.