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
Page Weight Budget
1.4 MB transferred, 77 requests
REVIEW
1.4 MB transferred, 77 requests
Info::
✓
Page weighs 3.6 MB (1.4 MB transferred)
Warning::
!
JavaScript is 870 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 870 KB
Info::
i
77 HTTP requests
Info::
i
Estimated 0.28 g CO2 per page load
1.4 MBtransferred
77 requests
0.28 g CO2 per page load
JavaScript870.3 KiB63%
Images312.0 KiB22%
Fonts78.5 KiB6%
HTML48.9 KiB4%
Other39.0 KiB3%
CSS39.0 KiB3%
Other553 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
C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://presentandperform.com/wp-content/uploads/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17images312 KB
0oversized-0 KB
17legacy format
15missing 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
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
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
Document Compression
Action
Document response served uncompressed
REVIEW
Document 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+
JS Execution Cost
449ms total JS execution
PASS
449ms total JS execution
Info::
i
https://www.gstatic.com/recaptcha/releases/kemdRjW...: 186ms CPU time
Info::
i
https://www.googletagmanager.com/gtag/js?id=GT-M6X...: 101ms CPU time
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
79 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
0QIvMX1D_JOuMwr7I_FMl_E...woff2swap
Size37 KB
Load time36 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x...woff2swap
Size8 KB
Load time22 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time53 ms
Start5.7 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
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
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.
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
i
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
77 requests over 6343ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
84%of JavaScript execution is third-party
First-party Third-party378ms · 196KB · NZ$6/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.gstatic.com
www.gstatic.com
Other
186ms
0 KB
53%
NZ$3/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
101ms
175 KB
42%
NZ$2/mo
Optional
presentandperform.com
presentandperform.com
Other
90ms
21 KB
—
NZ$1/mo
Optional
www.gstatic.com
Other
Optional
Execution186ms
Transfer0 KB
Unused53%
Monthly CostNZ$3/mo
Google Tag Manager
Tag Manager
Optional
Execution101ms
Transfer175 KB
Unused42%
Monthly CostNZ$2/mo
presentandperform.com
Other
Optional
Execution90ms
Transfer21 KB
Monthly CostNZ$1/mo
84% 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
53% of www.gstatic.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.