JavaScript is 808 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 808 KB
Info::
i
Fonts are 234 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 234 KB
Info::
i
94 HTTP requests
Info::
i
Estimated 0.29 g CO2 per page load
1.4 MBtransferred
94 requests
0.29 g CO2 per page load
JavaScript808.1 KiB58%
Fonts233.9 KiB17%
Images180.0 KiB13%
CSS101.7 KiB7%
HTML55.5 KiB4%
Other8.6 KiB1%
Other8.2 KiB1%
Other1.4 KiB0%
Other1.0 KiB0%
Other476 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
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
C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
!
https://yoast.com/app/uploads/2023/03/results_usp_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://yoast.com/app/uploads/2023/03/technical_us... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://yoast.com/app/uploads/2023/03/support_usp_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://yoast.com/app/uploads/2023/03/content_usp_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://yoast.com/app/uploads/2025/04/yoast_logo_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23images180 KB
0oversized-0 KB
10legacy format
5missing 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
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main 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.
C
Main HTML Cache-Control
Action
Main HTML max-age=57793 (~963min) is aggressive
REVIEW
Main HTML max-age=57793 (~963min) is aggressive
Warning::
!
Main HTML cached for 963 minutes -- risks stale auth / SPA state
Long max-age on the main HTML document means users may see outdated auth state, SPA shells, or A/B variants until the cache expires. Consider Cache-Control: no-cache (or max-age=300) for HTML and let your hashed assets (JS/CSS/images) carry the long cache instead.
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
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
!
11 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.
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 (234 KB)
PASS
4 fonts (234 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
234 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
OpenSans-Regular.woff2woff2swap
Size58 KB
Load time62 ms
Start95 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-Italic.woff2woff2swap
Size61 KB
Load time90 ms
Start95 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-SemiBold.woff2woff2swap
Size58 KB
Load time104 ms
Start95 ms
RiskFOUT — text flashes from fallback to web font
OpenSans-Bold.woff2woff2swap
Size56 KB
Load time104 ms
Start95 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Warning::
!
4 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-Regular.woff2, https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-Italic.woff2, https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-SemiBold.woff2 (+1 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
✓
Page uses 6 resource hint(s)
Current Resource Hints
preconnect—
preload
4
dns-prefetch
2
prefetch—
6 resource hints configured
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-Regular.woff2, https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-Italic.woff2, https://yoast.com/app/themes/yoast-com/assets/fonts/OpenSansStatic/OpenSans-SemiBold.woff2 (+1 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Why this matters
Performance issues directly impact user engagement and conversion rates.
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+
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Per-script blocking time, transfer cost, and cache headers
INFO
65%of JavaScript execution is third-party
First-party Third-party1677ms · 610KB · €9/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cdn-4.convertexperiments.com
cdn-4.convertexperiments.com
Other
482ms
105 KB
55%
€3/mo
Costly
Unattributable
Unattributable
Other
433ms
0 KB
—
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
356ms
183 KB
37%
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
195ms
171 KB
51%
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
141ms
144 KB
57%
€1/mo
Optional
widget.trustpilot.com
widget.trustpilot.com
Other
71ms
8 KB
—
€0/mo
Optional
cdn-4.convertexperiments.com
Other
Costly
Execution482ms
Transfer105 KB
Unused55%
Monthly Cost€3/mo
Unattributable
Other
Costly
Execution433ms
Transfer0 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Costly
Execution356ms
Transfer183 KB
Unused37%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution195ms
Transfer171 KB
Unused51%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution141ms
Transfer144 KB
Unused57%
Monthly Cost€1/mo
widget.trustpilot.com
Other
Optional
Execution71ms
Transfer8 KB
Monthly Cost€0/mo
These scripts may cost more than they're worth
cdn-4.convertexperiments.com adds 482ms and costs ~€3/month
Unattributable adds 433ms and costs ~€2/month
Google Tag Manager adds 356ms and costs ~€2/month
65% 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
cdn-4.convertexperiments.com takes 482ms 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 cdn-4.convertexperiments.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
Unattributable takes 433ms 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 356ms 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
51% 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
57% 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.