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https://remix.run

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
0
REVIEW
1
PASS
11
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.26 s

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

3.65 s

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

51 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.

5.86 s

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

3.65 s

Page Load Progression

564 ms
1.1 s
1.7 s
2.3 s
2.8 s
3.4 s
3.9 s
4.5 s
Checks
14
11 PASS 1 REVIEW
B
JS Execution Cost
779ms total JS execution
REVIEW
779ms total JS execution
Warning::
https://remix.run/: 439ms CPU time
Info::
Unattributable: 232ms CPU time
Info::
https://remix.run/assets/press-mixin-DBJjXhO4.js: 107ms CPU time
Info::
Third-party scripts: 232ms (30% of total)

Main Thread Breakdown

Other 47% Style & Layout 28% Script Evaluation 16% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://remix.run/439ms7ms2ms1st
Unattributable232ms9ms0ms3rd
https://remix.run/assets/press-mixin-DBJjXhO4.js107ms84ms0ms1st
A+
Page Weight Budget
355 KB transferred, 27 requests
PASS
355 KB transferred, 27 requests
Info::
Page weighs 520 KB (355 KB transferred)
Info::
27 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
355 KB / 2.4 MB budget
355 KB transferred
27 requests
0.07 g CO2 per page load
Fonts 177.9 KiB 50%
Images 115.8 KiB 33%
JavaScript 36.0 KiB 10%
CSS 13.3 KiB 4%
HTML 11.5 KiB 3%
Other 380 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (3.1 KiB of 354.9 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 116 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (178 KB)
PASS
3 fonts (178 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

178 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 3.6 shttps://remix.run/font/inter-roman-latin-var.woff2inter-roman-latin-var.w... https://remix.run/font/inter-roman-latin-var.woff2 — 51.4 KiB — 0 ms — font-display: swaphttps://remix.run/font/inter-italic-latin-var.woff2inter-italic-latin-var.... https://remix.run/font/inter-italic-latin-var.woff2 — 55.3 KiB — 0 ms — font-display: swaphttps://remix.run/font/jet-brains-mono.woff2jet-brains-mono.woff2 https://remix.run/font/jet-brains-mono.woff2 — 71.1 KiB — 0 ms — font-display: swap
inter-roman-latin-var.w... woff2 swap
Size 51 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
inter-italic-latin-var.... woff2 swap
Size 55 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
jet-brains-mono.woff2 woff2 swap
Size 71 KB
Load time 0 ms
Start 0 ms
Risk FOUT — 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+
JS Bundles
15 scripts, 0 KB unused
PASS
15 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://remix.run/assets/entry-D4dSdFfr.js1 KB—✓1st
https://remix.run/assets/run-xASvpGhP.js13 KB—✓1st
https://remix.run/assets/press-mixin-DBJjXhO4.js7 KB—✓1st
https://remix.run/assets/component-SBbtKMRE.js1 KB—✓1st
https://remix.run/assets/fathom-NjqLGHQ1.js1 KB—✓1st
https://cdn.usefathom.com/script.js3 KB—✓3rd
https://remix.run/assets/document-head-sync-TAR4oS0Q.js1 KB—✓1st
https://remix.run/assets/wordmark-link-yjz8cqqe.js2 KB—✓1st
https://remix.run/assets/mobile-menu-DK32ZxXP.js1 KB—✓1st
https://remix.run/assets/newsletter-subscribe-Bry4G0Mg.js5 KB—✓1st
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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 resource hints configured

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Axis12 Ltd

A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300, stale-while-revalidate=604800
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300, stale-while-revalidate=604800

DirectiveValueMeaning
max-age300Cache for 5 minutes
stale-while-revalidate604800Serve stale for 1 week while fetching fresh
Effective TTL: 300 seconds
Network Waterfall
27 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
30% of JavaScript execution is third-party
First-party Third-party 232ms · 0KB · $3/mo
Unattributable
Other
Costly
Execution 232ms
Transfer 0 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Unattributable adds 232ms and costs ~$3/month

Unattributable takes 232ms 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

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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