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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
1
REVIEW
0
PASS
14
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
63
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

811 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

811 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

811 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

811 ms

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
14 PASS 1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store, max-age=0

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
A+
Page Weight Budget
4 KB transferred, 3 requests
PASS
4 KB transferred, 3 requests
Info::
Page weighs 5 KB (4 KB transferred)
Info::
3 HTTP requests
Info::
Estimated 0.00 g CO2 per page load
4 KB / 2.4 MB budget
4 KB transferred
3 requests
0.00 g CO2 per page load
HTML 1.9 KiB 43%
Images 1.5 KiB 35%
Other 999 B 22%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
22% third-party, 0 ms blocking
PASS
22% third-party, 0 ms blocking
Info::
Third-party code accounts for 22% of page weight (999 B of 4.3 KiB)
Info::
Third-party blocking time is low (0 ms)
78%
22%
First-party Third-party
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
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://t.co/static/images/x.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 2 KB
0 oversized -0 KB
1 legacy format
1 missing dimensions CLS 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

A+
JS Execution Cost
162ms total JS execution
PASS
162ms total JS execution
Info::
Unattributable: 104ms CPU time
Info::
https://t.co/: 58ms CPU time
Warning::
Third-party scripts: 104ms (64% of total)

Main Thread Breakdown

Other 66% Style & Layout 21% Script Evaluation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable104ms5ms0ms3rd
https://t.co/58ms5ms1ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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+
Page Weight Inventory
3 resources · 4 KB · 0 KB savings available
PASS
3 resources · 4 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 4 KB
Info::
1 third-party resources (22% of weight)
3 resources · 4.3 KiB · 1 third-party Within 1MB page-weight target
Image 57% · 2.5 KiB
Document 43% · 1.9 KiB
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

Provider: Cloudflare

Network Waterfall
3 requests over 166ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 811 ms LCP 811 mshttps://t.co// https://t.co/ — 200 — 1.9 KiB — 51 ms — h2https://t.co/static/images/x.png/static/images/x.png https://t.co/static/images/x.png — 200 — 1.5 KiB — 41 ms — h2https://abs.twimg.com/favicons/favicon.icoabs.twimg.com/favicons/favicon.ico https://abs.twimg.com/favicons/favicon.ico — 200 — 999 B — 52 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 104ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 104ms
Transfer 0 KB
Monthly Cost €1/mo

64% 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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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