Skip to content
https://npmjs.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
4
PASS
10
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
91
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.

3.86 s

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

9.02 s

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

509 ms

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

0.002

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

4.18 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.

9.02 s

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
10 PASS 4 REVIEW 1 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Page Weight Budget
1.1 MB transferred, 22 requests
REVIEW
1.1 MB transferred, 22 requests
Info::
Page weighs 3.3 MB (1.1 MB transferred)
Warning::
JavaScript is 534 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 534 KB
Info::
22 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
22 requests
0.24 g CO2 per page load
JavaScript 533.6 KiB 46%
Images 473.6 KiB 41%
Fonts 67.1 KiB 6%
CSS 66.5 KiB 6%
Other 10.0 KiB 1%
HTML 10.0 KiB 1%
0 2.4 MB 4.9 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

C
JS Execution Cost
Action
1165ms total JS execution
REVIEW
1165ms total JS execution
Warning::
https://static-production.npmjs.com/commons.25ec51...: 409ms CPU time
Warning::
https://static-production.npmjs.com/homepage/homep...: 323ms CPU time
Info::
https://www.npmjs.com/: 225ms CPU time
Info::
Unattributable: 149ms CPU time
Info::
https://static-production.npmjs.com/styles.d204449...: 58ms CPU time
Warning::
Third-party scripts: 1165ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Script Parsing & Compilation 23% Other 17% Style & Layout 14% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://static-production.npmjs.com/commons.25ec510faf8ab2f7da87.js409ms179ms213ms3rd
https://static-production.npmjs.com/homepage/homepage.5c2021be080f40615647.js323ms269ms54ms3rd
https://www.npmjs.com/225ms18ms6ms3rd
Unattributable149ms6ms0ms3rd
https://static-production.npmjs.com/styles.d2044499a723fe6bb119.css58ms0ms0ms3rd
C
JS Bundles
Action
3 scripts, 292 KB unused
REVIEW
3 scripts, 292 KB unused
Warning::
https://static-production.npmjs.com/commons.25ec51...: 292 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 292 KB
292 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static-production.npmjs.com/commons.25ec510faf8ab2f7da87.js406 KB292 KB (74%)✓3rd
https://static-production.npmjs.com/minicssextractbug.89556a2e589d52acbf36.js21 KB—✓3rd
https://static-production.npmjs.com/homepage/homepage.5c2021be080f40615647.js107 KB—✓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

B
Page Weight Inventory
22 resources · 1.1 MB · 292 KB savings available
REVIEW
22 resources · 1.1 MB · 292 KB savings available
Warning::
Page weight 137 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~292 KB of savings available
Warning::
21 third-party resources (100% of weight)
Info::
2 resources over 200KB
22 resources · 1.1 MiB · 21 third-party 136.9 KiB over 1MB target
JavaScript 46% · 533.6 KiB
Image 41% · 474.8 KiB
Font 6% · 67.1 KiB
CSS 6% · 66.5 KiB
Document 2% · 18.8 KiB

~292.3 KiB of savings available

Remove unused JavaScript: 292.3 KiB
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://static-production.npmjs.com/attachments/ck... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 474 KB
0 oversized -0 KB
2 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+
Font Loading
7 fonts (67 KB)
PASS
7 fonts (67 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

67 KB total

Render-blocking

0

of 7

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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.9 s LCP 9.0 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 23 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 14 ms — font-display: swaphttps://fonts.gstatic.com/s/firamono/v16/N0bX2SlFPv1weGeLZDtgJv7Ss9XZYQ.woff2N0bX2SlFPv1weGeLZDtgJv7... https://fonts.gstatic.com/s/firamono/v16/N0bX2SlFPv1weGeLZDtgJv7Ss9XZYQ.woff2 — 10.5 KiB — 12 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 19 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/arimo/v35/P5sfzZCDf9_T_3cV7NCUECyoxNk37cxcABrBdwEoaQ.woff2P5sfzZCDf9_T_3cV7NCUECy... https://fonts.gstatic.com/s/arimo/v35/P5sfzZCDf9_T_3cV7NCUECyoxNk37cxcABrBdwEoaQ.woff2 — 11.2 KiB — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 14 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 23 ms
Start 340 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 14 ms
Start 342 ms
Risk FOUT — text flashes from fallback to web font
N0bX2SlFPv1weGeLZDtgJv7... woff2 swap
Size 11 KB
Load time 12 ms
Start 342 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 19 ms
Start 342 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 21 ms
Start 343 ms
Risk FOUT — text flashes from fallback to web font
P5sfzZCDf9_T_3cV7NCUECy... woff2 swap
Size 11 KB
Load time 17 ms
Start 343 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 14 ms
Start 344 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+
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+
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

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
22 requests over 1301ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.9 s LCP 9.0 shttps://npmjs.com// https://npmjs.com/ — 301 — 535 B — 33 ms — h2https://www.npmjs.com/www.npmjs.com/ https://www.npmjs.com/ — 200 — 10.0 KiB — 48 ms — h2https://static-production.npmjs.com/styles.d2044499a723fe6bb119.cssstatic-production.npmjs.com/styles.... https://static-production.npmjs.com/styles.d2044499a723fe6bb119.css — 200 — 63.1 KiB — 59 ms — h2https://static-production.npmjs.com/attachments/ck3uwed1cmso79y74pjugy10f-gak-2x.pngstatic-production.npmjs.com/attachm... https://static-production.npmjs.com/attachments/ck3uwed1cmso79y74pjugy10f-gak-2x.png — 200 — 44.8 KiB — 60 ms — h2https://fonts.googleapis.com/css?family=Arimo|Poppins:400,600,700&display=swapfonts.googleapis.com/css?family=Ari... https://fonts.googleapis.com/css?family=Arimo|Poppins:400,600,700&display=swap — 200 — 1.3 KiB — 43 ms — h2https://static-production.npmjs.com/commons.25ec510faf8ab2f7da87.jsstatic-production.npmjs.com/commons... https://static-production.npmjs.com/commons.25ec510faf8ab2f7da87.js — 200 — 405.6 KiB — 73 ms — h2https://static-production.npmjs.com/minicssextractbug.89556a2e589d52acbf36.jsstatic-production.npmjs.com/minicss... https://static-production.npmjs.com/minicssextractbug.89556a2e589d52acbf36.js — 200 — 20.6 KiB — 45 ms — h2https://static-production.npmjs.com/homepage/homepage.5c2021be080f40615647.jsstatic-production.npmjs.com/homepag... https://static-production.npmjs.com/homepage/homepage.5c2021be080f40615647.js — 200 — 107.4 KiB — 53 ms — h2https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600fonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600 — 200 — 869 B — 80 ms — h2https://fonts.googleapis.com/css?family=Fira+Monofonts.googleapis.com/css?family=Fir... https://fonts.googleapis.com/css?family=Fira+Mono — 200 — 688 B — 27 ms — h2https://fonts.googleapis.com/css?family=Poppins:400,500,600fonts.googleapis.com/css?family=Pop... https://fonts.googleapis.com/css?family=Poppins:400,500,600 — 200 — 598 B — 45 ms — h2https://static-production.npmjs.com/abf53a31b2da4657a1a004ee9358551c.pngstatic-production.npmjs.com/abf53a3... https://static-production.npmjs.com/abf53a31b2da4657a1a004ee9358551c.png — 200 — 428.8 KiB — 53 ms — h2https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 200 — 14.5 KiB — 23 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 200 — 7.6 KiB — 14 ms — h3https://fonts.gstatic.com/s/firamono/v16/N0bX2SlFPv1weGeLZDtgJv7Ss9XZYQ.woff2fonts.gstatic.com/s/firamono/v16/N0... https://fonts.gstatic.com/s/firamono/v16/N0bX2SlFPv1weGeLZDtgJv7Ss9XZYQ.woff2 — 200 — 10.5 KiB — 12 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 19 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 200 — 7.8 KiB — 21 ms — h3https://fonts.gstatic.com/s/arimo/v35/P5sfzZCDf9_T_3cV7NCUECyoxNk37cxcABrBdwEoaQ.woff2fonts.gstatic.com/s/arimo/v35/P5sfz... https://fonts.gstatic.com/s/arimo/v35/P5sfzZCDf9_T_3cV7NCUECyoxNk37cxcABrBdwEoaQ.woff2 — 200 — 11.2 KiB — 17 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 200 — 7.7 KiB — 14 ms — h3https://static-production.npmjs.com/f1c1c1c0922247b9630c1edb1e6f31b2.pngstatic-production.npmjs.com/f1c1c1c... https://static-production.npmjs.com/f1c1c1c0922247b9630c1edb1e6f31b2.png — 200 — 450 B — 20 ms — h2https://www.npmjs.com/favicon.icowww.npmjs.com/favicon.ico https://www.npmjs.com/favicon.ico — 404 — 8.3 KiB — 32 ms — h2https://static-production.npmjs.com/b0f1a8318363185cc2ea6a40ac23eeb2.pngstatic-production.npmjs.com/b0f1a83... https://static-production.npmjs.com/b0f1a8318363185cc2ea6a40ac23eeb2.png — 200 — 786 B — 20 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 1165ms · 586KB · $15/mo
static-production.npmjs.com
Other
Costly
Execution 409ms
Transfer 406 KB
Unused 74%
Monthly Cost $5/mo
static-production.npmjs.com
Other
Costly
Execution 323ms
Transfer 107 KB
Monthly Cost $4/mo
www.npmjs.com
Other
Costly
Execution 225ms
Transfer 10 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 149ms
Transfer 0 KB
Monthly Cost $2/mo
static-production.npmjs.com
Other
Optional
Execution 58ms
Transfer 63 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static-production.npmjs.com adds 409ms and costs ~$5/month
  • static-production.npmjs.com adds 323ms and costs ~$4/month
  • www.npmjs.com adds 225ms and costs ~$3/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

static-production.npmjs.com takes 409ms 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

74% of static-production.npmjs.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

static-production.npmjs.com takes 323ms 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.npmjs.com takes 225ms 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.

Send Feedback