Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Page Weight Budget
Action
1.9 MB transferred, 57 requests
REVIEW
1.9 MB transferred, 57 requests
Info::
i
Page weighs 5.6 MB (1.9 MB transferred)
Warning::
!
JavaScript is 1011 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1011 KB
Info::
i
Fonts are 211 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 211 KB
Info::
i
57 HTTP requests
Info::
i
Estimated 0.40 g CO2 per page load
1.9 MBtransferred
57 requests
0.40 g CO2 per page load
JavaScript1011.0 KiB52%
Images490.1 KiB25%
Fonts211.1 KiB11%
CSS171.9 KiB9%
HTML33.8 KiB2%
Other7.7 KiB0%
Other7.6 KiB0%
Other554 B0%
Other545 B0%
02.4 MB4.9 MB
Approaching limit
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
Subset fonts to include only used characters, or switch to system font stacks.
Why this matters
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
B
Third-Party Impact
56% third-party, 0 ms blocking
REVIEW
56% third-party, 0 ms blocking
Warning::
!
Third-party code accounts for 56% of page weight (1.1 MiB of 1.9 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
44%
56%
First-party Third-party
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
✓
All images are well-optimized
10images490 KB
0oversized-0 KB
10legacy format
0missing dimensionsCLS risk
B
Asset Compression
1 of 2 asset hosts serve text uncompressed
REVIEW
1 of 2 asset hosts serve text uncompressed
Info::
✓
maps.googleapis.com serves assets with brotli (assets: 6)
Got: maps.googleapis.com (text/javascript)
Warning::
!
fonts.googleapis.com serves text assets uncompressed (assets: 4)
The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.
Got: fonts.googleapis.com (text/css)
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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
!
23 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 3.6 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.
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
8 fonts (211 KB)
PASS
8 fonts (211 KB)
Info::
i
8 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
8
211 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
memtYaGs126MiZpBA-UFUIc...woff2swap
Size44 KB
Load time154 ms
Start515 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time146 ms
Start515 ms
RiskFOUT — text flashes from fallback to web font
4iCs6KVjbNBYlgoKfw72nU6...woff2swap
Size14 KB
Load time56 ms
Start718 ms
RiskFOUT — text flashes from fallback to web font
4iCv6KVjbNBYlgoCxCvjvmy...woff2swap
Size17 KB
Load time73 ms
Start718 ms
RiskFOUT — text flashes from fallback to web font
4iCv6KVjbNBYlgoCxCvjsGy...woff2swap
Size15 KB
Load time79 ms
Start718 ms
RiskFOUT — text flashes from fallback to web font
4iCs6KVjbNBYlgoKcQ72nU6...woff2swap
Size17 KB
Load time69 ms
Start718 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size30 KB
Load time84 ms
Start718 ms
RiskFOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc...woff2swap
Size32 KB
Load time58 ms
Start1.1 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
✓
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
1
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+
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 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::
✓
`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
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
!
2 `@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.
Network Waterfall
57 requests over 1523ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
25%of JavaScript execution is third-party
First-party Third-party888ms · 537KB · lei24/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Google Tag Manager
www.googletagmanager.com
Tag Manager
395ms
185 KB
40%
lei11/mo
Costly
maps.googleapis.com
maps.googleapis.com
Other
149ms
103 KB
55%
lei4/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
132ms
120 KB
58%
lei4/mo
Optional
maps.googleapis.com
maps.googleapis.com
Other
83ms
38 KB
74%
lei2/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
78ms
21 KB
—
lei2/mo
Optional
maps.googleapis.com
maps.googleapis.com
Other
52ms
71 KB
38%
lei1/mo
Optional
Google Tag Manager
Tag Manager
Costly
Execution395ms
Transfer185 KB
Unused40%
Monthly Costlei11/mo
maps.googleapis.com
Other
Optional
Execution149ms
Transfer103 KB
Unused55%
Monthly Costlei4/mo
Google Tag Manager
Tag Manager
Optional
Execution132ms
Transfer120 KB
Unused58%
Monthly Costlei4/mo
maps.googleapis.com
Other
Optional
Execution83ms
Transfer38 KB
Unused74%
Monthly Costlei2/mo
Google Analytics
Analytics
Optional
Execution78ms
Transfer21 KB
Monthly Costlei2/mo
maps.googleapis.com
Other
Optional
Execution52ms
Transfer71 KB
Unused38%
Monthly Costlei1/mo
These scripts may cost more than they're worth
Google Tag Manager adds 395ms and costs ~lei11/month
Google Tag Manager takes 395ms 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 maps.googleapis.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
58% 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.
Source: web.dev
74% of maps.googleapis.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.