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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
16
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.
85
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.

6.77 s

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

16.61 s

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

1.62 s

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

0.300

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

8.39 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.

24.69 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.6 s
7.7 s
8.8 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 189 requests
FIX
3.7 MB transferred, 189 requests
Warning::
Page weighs 11.5 MB (3.7 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Warning::
189 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.79 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
189 requests
0.79 g CO2 per page load
JavaScript 2.1 MiB 55%
Other 1.0 MiB 27%
HTML 221.3 KiB 6%
Images 167.6 KiB 4%
Fonts 152.0 KiB 4%
CSS 109.0 KiB 3%
Other 46.6 KiB 1%
Other 201 B 0%
Other 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
21160ms total JS execution
FIX
21160ms total JS execution
Warning::
https://redis.io/_next/static/chunks/7369-0f075421...: 14905ms CPU time
Warning::
Unattributable: 2165ms CPU time
Warning::
https://redis.io/: 1281ms CPU time
Warning::
https://redis.io/_next/static/chunks/c36f3faa-bf84...: 529ms CPU time
Warning::
https://redis.io/_next/static/chunks/bf76e631-a760...: 401ms CPU time
Warning::
Third-party scripts: 21160ms (100% of total)

Main Thread Breakdown

Other 38% Script Evaluation 32% Style & Layout 19% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://redis.io/_next/static/chunks/7369-0f0754218170d7e9.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw14905ms4108ms29ms3rd
Unattributable2165ms225ms0ms3rd
https://redis.io/1281ms157ms112ms3rd
https://redis.io/_next/static/chunks/c36f3faa-bf8431af233775b3.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw529ms394ms120ms3rd
https://redis.io/_next/static/chunks/bf76e631-a760aa8cff633f5a.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw401ms387ms10ms3rd
https://cdn.jsdelivr.net/npm/hockeystack@latest/hockeystack.min.js400ms346ms2ms3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-8549333ms191ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKZ6J9R256ms197ms50ms3rd
https://redis.io/_next/static/chunks/bf6a786c-381ced19b77084c2.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw214ms177ms16ms3rd
https://redis.io/_next/static/chunks/2636-1969dde127208522.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw194ms159ms34ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
48 scripts, 1.1 MB unused
FIX
48 scripts, 1.1 MB unused
Warning::
https://redis.io/_next/static/chunks/c36f3faa-bf84...: 342 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://redis.io/_next/static/chunks/9146-646ea785...: 213 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://redis.io/_next/static/chunks/1453-51dbae4c...: 128 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.amplitude.com/engagement-browser/prod/...: 98 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://redis.io/_next/static/chunks/2170a4aa-1514...: 88 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1156 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://redis.io/_next/static/chunks/c36f3faa-bf8431af233775b3.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw427 KB342 KB (80%)✓3rd
https://redis.io/_next/static/chunks/9146-646ea7851ff0b9e9.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw282 KB213 KB (76%)✓3rd
https://redis.io/_next/static/chunks/1453-51dbae4c2474dde3.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw177 KB128 KB (72%)✓3rd
https://cdn.amplitude.com/engagement-browser/prod/split/df9b61a9061fbc33ed8e6b620d00ea2d64efb94f-chunk-7V35RKKP.js168 KB98 KB (59%)✓3rd
https://redis.io/_next/static/chunks/2170a4aa-1514f5a56eef99b1.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw110 KB88 KB (81%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TKZ6J9R174 KB81 KB (47%)✓3rd
https://redis.io/_next/static/chunks/2636-1969dde127208522.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw136 KB81 KB (59%)✓3rd
https://redis.io/_next/static/chunks/7369-0f0754218170d7e9.js?dpl=dpl_em4Txm4spqw9TmwDRzvoK8nocXcw110 KB53 KB (48%)✓3rd
https://cdn.amplitude.com/engagement-browser/prod/split/df9b61a9061fbc33ed8e6b620d00ea2d64efb94f-chunk-WO7XXSIO.js65 KB48 KB (75%)✓3rd
https://cdn.amplitude.com/engagement-browser/prod/split/index.js40 KB23 KB (59%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
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
73 images, 0 KB saveable
REVIEW
73 images, 0 KB saveable
Info::
All images are well-optimized
73 images 168 KB
0 oversized -0 KB
40 legacy format
0 missing dimensions CLS risk
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
5 fonts (152 KB)
PASS
5 fonts (152 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

152 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 6.8 s LCP 16.6 shttps://redis.io/_next/static/media/36966cca54120369-s.p.woff236966cca54120369-s.p.woff2 https://redis.io/_next/static/media/36966cca54120369-s.p.woff2 — 22.0 KiB — 0 ms — font-display: swaphttps://redis.io/_next/static/media/489d530265462d6c-s.p.woff2489d530265462d6c-s.p.woff2 https://redis.io/_next/static/media/489d530265462d6c-s.p.woff2 — 64.4 KiB — 0 ms — font-display: swaphttps://redis.io/_next/static/media/806de4d605d3ad01-s.p.woff2806de4d605d3ad01-s.p.woff2 https://redis.io/_next/static/media/806de4d605d3ad01-s.p.woff2 — 9.6 KiB — 0 ms — font-display: swaphttps://redis.io/_next/static/media/fc727f226c737876-s.p.woff2fc727f226c737876-s.p.woff2 https://redis.io/_next/static/media/fc727f226c737876-s.p.woff2 — 9.6 KiB — 0 ms — font-display: swaphttps://consent.trustarc.com/get?name=Graphik-Regular.ttfget https://consent.trustarc.com/get?name=Graphik-Regular.ttf — 46.4 KiB — 0 ms — font-display: swap
36966cca54120369-s.p.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
489d530265462d6c-s.p.woff2 woff2 swap
Size 64 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
806de4d605d3ad01-s.p.woff2 woff2 swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fc727f226c737876-s.p.woff2 woff2 swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
get ttf swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~14 KB and ~28 ms

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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
8
dns-prefetch
—
prefetch
—

8 resource hints configured

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
189 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
100% of JavaScript execution is third-party
First-party Third-party 21160ms · 1689KB · $397/mo
redis.io
Other
Costly
Execution 14905ms
Transfer 110 KB
Unused 48%
Monthly Cost $280/mo
Unattributable
Other
Costly
Execution 2165ms
Transfer 0 KB
Monthly Cost $41/mo
redis.io
Other
Costly
Execution 1281ms
Transfer 221 KB
Monthly Cost $24/mo
redis.io
Other
Costly
Execution 529ms
Transfer 427 KB
Unused 80%
Monthly Cost $10/mo
redis.io
Other
Costly
Execution 401ms
Transfer 39 KB
Monthly Cost $8/mo
jsDelivr
CDN
Costly
Execution 400ms
Transfer 10 KB
Monthly Cost $7/mo
consent.trustarc.com
Other
Costly
Execution 333ms
Transfer 36 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 256ms
Transfer 174 KB
Unused 47%
Monthly Cost $5/mo
redis.io
Other
Costly
Execution 214ms
Transfer 55 KB
Monthly Cost $4/mo
redis.io
Other
Optional
Execution 194ms
Transfer 136 KB
Unused 59%
Monthly Cost $4/mo
redis.io
Other
Optional
Execution 148ms
Transfer 2 KB
Monthly Cost $3/mo
redis.io
Other
Optional
Execution 125ms
Transfer 282 KB
Unused 76%
Monthly Cost $2/mo
redis.io
Other
Optional
Execution 104ms
Transfer 13 KB
Monthly Cost $2/mo
redis.io
Other
Optional
Execution 53ms
Transfer 7 KB
Monthly Cost $1/mo
redis.io
Other
Optional
Execution 53ms
Transfer 177 KB
Unused 72%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • redis.io adds 14905ms and costs ~$280/month
  • Unattributable adds 2165ms and costs ~$41/month
  • redis.io adds 1281ms and costs ~$24/month
  • redis.io adds 529ms and costs ~$10/month
  • redis.io adds 401ms and costs ~$8/month
  • jsDelivr adds 400ms and costs ~$7/month
  • consent.trustarc.com adds 333ms and costs ~$6/month
  • Google Tag Manager adds 256ms and costs ~$5/month
  • redis.io adds 214ms and costs ~$4/month

100% 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

redis.io takes 14905ms 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

Unattributable takes 2165ms 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

redis.io takes 1281ms 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

redis.io takes 529ms 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

80% of redis.io'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

redis.io takes 401ms 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

jsDelivr takes 400ms 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

consent.trustarc.com takes 333ms 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 256ms 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

redis.io takes 214ms 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

59% of redis.io'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

76% of redis.io'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

72% of redis.io'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

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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