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
89 images, 0 KB saveable
REVIEW
89 images, 0 KB saveable
Warning::
!
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
89images1.4 MB
0oversized-0 KB
81legacy format
1missing dimensionsCLS risk
Set explicit width and height to prevent CLS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
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.
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
4 fonts (58 KB)
PASS
4 fonts (58 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
58 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
public-sans-v15-latin-r...woff2swap
Size15 KB
Load time101 ms
Start845 ms
RiskFOUT — text flashes from fallback to web font
public-sans-v15-latin-6...woff2swap
Size15 KB
Load time113 ms
Start845 ms
RiskFOUT — text flashes from fallback to web font
public-sans-v15-latin-7...woff2swap
Size15 KB
Load time119 ms
Start846 ms
RiskFOUT — text flashes from fallback to web font
public-sans-v15-latin-9...woff2swap
Size14 KB
Load time120 ms
Start848 ms
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+
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+
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 8.6 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.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
✓
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
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
190 requests over 5423ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
85%of JavaScript execution is third-party
First-party Third-party7296ms · 3392KB · $97/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
static.oddschecker.com
static.oddschecker.com
Other
1296ms
70 KB
56%
$17/mo
Costly
www.oddschecker.com
www.oddschecker.com
Other
716ms
84 KB
—
$10/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
613ms
194 KB
26%
$8/mo
Costly
cx-resources.oddschecker.com
cx-resources.oddschecker.com
Other
503ms
29 KB
—
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
447ms
181 KB
41%
$6/mo
Costly
static.oddschecker.com
static.oddschecker.com
Other
443ms
3 KB
—
$6/mo
Costly
static.oddschecker.com
static.oddschecker.com
Other
437ms
46 KB
54%
$6/mo
Costly
pluggedlabs.com
pluggedlabs.com
Other
349ms
96 KB
46%
$5/mo
Costly
cdn.oddschecker.com
cdn.oddschecker.com
Other
338ms
36 KB
—
$4/mo
Costly
www.oddschecker.com
www.oddschecker.com
Other
265ms
0 KB
—
$4/mo
Costly
cdn.oddschecker.com
cdn.oddschecker.com
Other
253ms
122 KB
50%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
252ms
170 KB
42%
$3/mo
Costly
static.oddschecker.com
static.oddschecker.com
Other
238ms
129 KB
50%
$3/mo
Costly
static.oddschecker.com
static.oddschecker.com
Other
234ms
28 KB
—
$3/mo
Costly
pluggedlabs.com
pluggedlabs.com
Other
222ms
207 KB
44%
$3/mo
Costly
cdn.oddschecker.com
cdn.oddschecker.com
Other
207ms
1688 KB
82%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
184ms
159 KB
43%
$2/mo
Optional
static.cloudflareinsights.com
static.cloudflareinsights.com
Other
113ms
10 KB
—
$2/mo
Optional
cdn.webpu.sh
cdn.webpu.sh
Other
72ms
41 KB
—
$1/mo
Optional
cdn.oddschecker.com
cdn.oddschecker.com
Other
62ms
0 KB
—
$1/mo
Optional
widgets.oddschecker.com
widgets.oddschecker.com
Other
52ms
98 KB
89%
$1/mo
Optional
static.oddschecker.com
Other
Costly
Execution1296ms
Transfer70 KB
Unused56%
Monthly Cost$17/mo
www.oddschecker.com
Other
Costly
Execution716ms
Transfer84 KB
Monthly Cost$10/mo
Google Tag Manager
Tag Manager
Costly
Execution613ms
Transfer194 KB
Unused26%
Monthly Cost$8/mo
cx-resources.oddschecker.com
Other
Costly
Execution503ms
Transfer29 KB
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution447ms
Transfer181 KB
Unused41%
Monthly Cost$6/mo
static.oddschecker.com
Other
Costly
Execution443ms
Transfer3 KB
Monthly Cost$6/mo
static.oddschecker.com
Other
Costly
Execution437ms
Transfer46 KB
Unused54%
Monthly Cost$6/mo
pluggedlabs.com
Other
Costly
Execution349ms
Transfer96 KB
Unused46%
Monthly Cost$5/mo
cdn.oddschecker.com
Other
Costly
Execution338ms
Transfer36 KB
Monthly Cost$4/mo
www.oddschecker.com
Other
Costly
Execution265ms
Transfer0 KB
Monthly Cost$4/mo
cdn.oddschecker.com
Other
Costly
Execution253ms
Transfer122 KB
Unused50%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution252ms
Transfer170 KB
Unused42%
Monthly Cost$3/mo
static.oddschecker.com
Other
Costly
Execution238ms
Transfer129 KB
Unused50%
Monthly Cost$3/mo
static.oddschecker.com
Other
Costly
Execution234ms
Transfer28 KB
Monthly Cost$3/mo
pluggedlabs.com
Other
Costly
Execution222ms
Transfer207 KB
Unused44%
Monthly Cost$3/mo
cdn.oddschecker.com
Other
Costly
Execution207ms
Transfer1688 KB
Unused82%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Optional
Execution184ms
Transfer159 KB
Unused43%
Monthly Cost$2/mo
static.cloudflareinsights.com
Other
Optional
Execution113ms
Transfer10 KB
Monthly Cost$2/mo
cdn.webpu.sh
Other
Optional
Execution72ms
Transfer41 KB
Monthly Cost$1/mo
cdn.oddschecker.com
Other
Optional
Execution62ms
Transfer0 KB
Monthly Cost$1/mo
widgets.oddschecker.com
Other
Optional
Execution52ms
Transfer98 KB
Unused89%
Monthly Cost$1/mo
These scripts may cost more than they're worth
static.oddschecker.com adds 1296ms and costs ~$17/month
www.oddschecker.com adds 716ms and costs ~$10/month
Google Tag Manager adds 613ms and costs ~$8/month
cx-resources.oddschecker.com adds 503ms and costs ~$7/month
Google Tag Manager adds 447ms and costs ~$6/month
static.oddschecker.com adds 443ms and costs ~$6/month
static.oddschecker.com adds 437ms and costs ~$6/month
pluggedlabs.com adds 349ms and costs ~$5/month
cdn.oddschecker.com adds 338ms and costs ~$4/month
www.oddschecker.com adds 265ms and costs ~$4/month
cdn.oddschecker.com adds 253ms and costs ~$3/month
Google Tag Manager adds 252ms and costs ~$3/month
static.oddschecker.com adds 238ms and costs ~$3/month
static.oddschecker.com adds 234ms and costs ~$3/month
pluggedlabs.com adds 222ms and costs ~$3/month
cdn.oddschecker.com adds 207ms and costs ~$3/month
85% 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
static.oddschecker.com takes 1296ms 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
56% of static.oddschecker.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.oddschecker.com takes 716ms 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
Google Tag Manager takes 613ms 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
cx-resources.oddschecker.com takes 503ms 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
Google Tag Manager takes 447ms 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.oddschecker.com takes 443ms 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.oddschecker.com takes 437ms 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
54% of static.oddschecker.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
pluggedlabs.com takes 349ms 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
cdn.oddschecker.com takes 338ms 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.oddschecker.com takes 265ms 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
cdn.oddschecker.com takes 253ms 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
Google Tag Manager takes 252ms 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.oddschecker.com takes 238ms 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.oddschecker.com takes 234ms 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
pluggedlabs.com takes 222ms 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
cdn.oddschecker.com takes 207ms 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 cdn.oddschecker.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
89% of widgets.oddschecker.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.