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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.

638 ms

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

1.43 s

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

192 ms

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

0.001

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

1.42 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.

1.44 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
15
7 PASS 4 REVIEW 2 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 (789.0 KiB of 789.2 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
JS Execution Cost
725ms total JS execution
REVIEW
725ms total JS execution
Info::
https://www.wolframalpha.com/_next/static/chunks/f...: 220ms CPU time
Info::
https://www.wolframalpha.com/_next/static/chunks/p...: 162ms CPU time
Info::
https://www.wolframalpha.com/: 154ms CPU time
Info::
https://www.wolframalpha.com/_next/static/chunks/p...: 118ms CPU time
Info::
Unattributable: 72ms CPU time
Warning::
Third-party scripts: 725ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 15% Style & Layout 14% Script Parsing & Compilation 11%
ScriptTotalScriptingParse/CompileParty
https://www.wolframalpha.com/_next/static/chunks/framework-7e404342b933869f.js220ms176ms8ms3rd
https://www.wolframalpha.com/_next/static/chunks/pages/index-af52cfcd888931b0.js162ms161ms1ms3rd
https://www.wolframalpha.com/154ms2ms1ms3rd
https://www.wolframalpha.com/_next/static/chunks/pages/_app-5e36c1fbb0d9113d.js118ms90ms26ms3rd
Unattributable72ms2ms0ms3rd
C
JS Bundles
Action
15 scripts, 243 KB unused
REVIEW
15 scripts, 243 KB unused
Warning::
https://www.wolframalpha.com/_next/static/chunks/p...: 75 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wolframalpha.com/_next/static/chunks/4...: 70 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wolframalpha.com/_next/static/chunks/9...: 50 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wolframalpha.com/_next/static/chunks/2...: 26 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wolframalpha.com/_next/static/chunks/f...: 22 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 243 KB
243 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.wolframalpha.com/_next/static/chunks/pages/_app-5e36c1fbb0d9113d.js195 KB75 KB (39%)✓3rd
https://www.wolframalpha.com/_next/static/chunks/4869-e9da3fb3526a80a2.js127 KB70 KB (57%)✓3rd
https://www.wolframalpha.com/_next/static/chunks/9afd5809-45a13b3d11fec1dd.js85 KB50 KB (60%)✓3rd
https://www.wolframalpha.com/_next/static/chunks/275-c6462c43c8fa56a7.js65 KB26 KB (40%)✓3rd
https://www.wolframalpha.com/_next/static/chunks/framework-7e404342b933869f.js59 KB22 KB (37%)✓3rd
https://www.wolframalpha.com/_next/static/chunks/main-9c7afc91105fe70f.js36 KB—✓3rd
https://www.wolframalpha.com/_next/static/chunks/webpack-e631c0b9bc4c85ae.js4 KB—✓3rd
https://www.wolframalpha.com/_next/static/chunks/8798.f5faec180d9de442.js5 KB—✓3rd
https://www.wolframalpha.com/_next/static/chunks/4705-1f37cf179cd9bab9.js9 KB—✓3rd
https://www.wolframalpha.com/_next/static/chunks/8020-c1252a00af52e09c.js4 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

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

B
Page Weight Inventory
28 resources · 789 KB · 243 KB savings available
REVIEW
28 resources · 789 KB · 243 KB savings available
Info::
Within 1MB page-weight target
Got: 789 KB
Info::
~243 KB of savings available
Warning::
27 third-party resources (100% of weight)
28 resources · 789.2 KiB · 27 third-party Within 1MB page-weight target
JavaScript 77% · 609.1 KiB
Font 14% · 112.9 KiB
Document 7% · 58.8 KiB
CSS 1% · 5.3 KiB
Image 0% · 2.6 KiB
Other 0% · 420 B

~242.8 KiB of savings available

Remove unused JavaScript: 242.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
789 KB transferred, 28 requests
PASS
789 KB transferred, 28 requests
Info::
Page weighs 2.4 MB (789 KB transferred)
Warning::
JavaScript is 609 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 609 KB
Info::
28 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
789 KB / 2.4 MB budget
789 KB transferred
28 requests
0.16 g CO2 per page load
JavaScript 609.1 KiB 77%
Fonts 112.9 KiB 14%
HTML 58.6 KiB 7%
CSS 5.3 KiB 1%
Other 2.0 KiB 0%
Images 785 B 0%
Other 420 B 0%
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

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
Info::
All images are well-optimized
1 images 1 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (113 KB)
PASS
6 fonts (113 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

113 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 638 ms LCP 1.4 shttps://www.wolframalpha.com/_next/static/media/roboto-latin-italic-400.fac7cf37.woff2roboto-latin-italic-400... https://www.wolframalpha.com/_next/static/media/roboto-latin-italic-400.fac7cf37.woff2 — 11.4 KiB — 144 ms — font-display: swaphttps://www.wolframalpha.com/_next/static/media/roboto-latin-400.7e0ffa28.woff2roboto-latin-400.7e0ffa... https://www.wolframalpha.com/_next/static/media/roboto-latin-400.7e0ffa28.woff2 — 10.2 KiB — 136 ms — font-display: swaphttps://www.wolframalpha.com/_next/static/media/Lexia_W_LtIt.763dc789.woffLexia_W_LtIt.763dc789.woff https://www.wolframalpha.com/_next/static/media/Lexia_W_LtIt.763dc789.woff — 31.6 KiB — 140 ms — font-display: swaphttps://www.wolframalpha.com/_next/static/media/Lexia_W_Lt.19c4cb27.woffLexia_W_Lt.19c4cb27.woff https://www.wolframalpha.com/_next/static/media/Lexia_W_Lt.19c4cb27.woff — 31.6 KiB — 132 ms — font-display: swaphttps://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-regular.090a5408.woff2source-sans-pro-v9-lati... https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-regular.090a5408.woff2 — 14.2 KiB — 136 ms — font-display: swaphttps://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-600.96f36c1a.woff2source-sans-pro-v9-lati... https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-600.96f36c1a.woff2 — 13.9 KiB — 145 ms — font-display: swap
roboto-latin-italic-400... woff2 swap
Size 11 KB
Load time 144 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
roboto-latin-400.7e0ffa... woff2 swap
Size 10 KB
Load time 136 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Lexia_W_LtIt.763dc789.woff woff swap
Size 32 KB
Load time 140 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lexia_W_Lt.19c4cb27.woff woff swap
Size 32 KB
Load time 132 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
source-sans-pro-v9-lati... woff2 swap
Size 14 KB
Load time 136 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
source-sans-pro-v9-lati... woff2 swap
Size 14 KB
Load time 145 ms
Start 1.3 s
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)

Fixing the unchecked items could save ~19 KB and ~38 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
28 requests over 2067ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 638 ms LCP 1.4 shttps://wolframalpha.com// https://wolframalpha.com/ — 301 — 184 B — 414 ms — h2https://www.wolframalpha.com/www.wolframalpha.com/ https://www.wolframalpha.com/ — 200 — 58.6 KiB — 685 ms — h2https://www.wolframalpha.com/_next/static/css/b86fd688f650caa5.csswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/css/b86fd688f650caa5.css — 200 — 2.9 KiB — 206 ms — h2https://www.wolframalpha.com/_next/static/css/3e5e2c10614026a5.csswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/css/3e5e2c10614026a5.css — 200 — 2.3 KiB — 316 ms — h2https://www.wolframalpha.com/_next/static/chunks/8798.f5faec180d9de442.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/8798.f5faec180d9de442.js — 200 — 5.0 KiB — 193 ms — h2https://www.wolframalpha.com/_next/static/chunks/5158.41b2a0edc99f4bf2.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/5158.41b2a0edc99f4bf2.js — 200 — 3.8 KiB — 197 ms — h2https://www.wolframalpha.com/_next/static/chunks/webpack-e631c0b9bc4c85ae.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/webpack-e631c0b9bc4c85ae.js — 200 — 3.7 KiB — 194 ms — h2https://www.wolframalpha.com/_next/static/chunks/framework-7e404342b933869f.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/framework-7e404342b933869f.js — 200 — 58.7 KiB — 374 ms — h2https://www.wolframalpha.com/_next/static/chunks/main-9c7afc91105fe70f.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/main-9c7afc91105fe70f.js — 200 — 36.5 KiB — 301 ms — h2https://www.wolframalpha.com/_next/static/chunks/pages/_app-5e36c1fbb0d9113d.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/pages/_app-5e36c1fbb0d9113d.js — 200 — 195.0 KiB — 480 ms — h2https://www.wolframalpha.com/_next/static/chunks/9afd5809-45a13b3d11fec1dd.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/9afd5809-45a13b3d11fec1dd.js — 200 — 84.5 KiB — 537 ms — h2https://www.wolframalpha.com/_next/static/chunks/4705-1f37cf179cd9bab9.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/4705-1f37cf179cd9bab9.js — 200 — 8.7 KiB — 480 ms — h2https://www.wolframalpha.com/_next/static/chunks/8020-c1252a00af52e09c.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/8020-c1252a00af52e09c.js — 200 — 3.7 KiB — 485 ms — h2https://www.wolframalpha.com/_next/static/chunks/4869-e9da3fb3526a80a2.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/4869-e9da3fb3526a80a2.js — 200 — 126.9 KiB — 519 ms — h2https://www.wolframalpha.com/_next/static/chunks/275-c6462c43c8fa56a7.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/275-c6462c43c8fa56a7.js — 200 — 64.7 KiB — 510 ms — h2https://www.wolframalpha.com/_next/static/chunks/2076-815fa431d95bd462.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/2076-815fa431d95bd462.js — 200 — 3.4 KiB — 478 ms — h2https://www.wolframalpha.com/_next/static/chunks/pages/index-af52cfcd888931b0.jswww.wolframalpha.com/_next/static/c... https://www.wolframalpha.com/_next/static/chunks/pages/index-af52cfcd888931b0.js — 200 — 11.4 KiB — 483 ms — h2https://www.wolframalpha.com/_next/static/WbTuK-0nortdGU19HhY8s/_buildManifest.jswww.wolframalpha.com/_next/static/W... https://www.wolframalpha.com/_next/static/WbTuK-0nortdGU19HhY8s/_buildManifest.js — 200 — 2.6 KiB — 485 ms — h2https://www.wolframalpha.com/_next/static/WbTuK-0nortdGU19HhY8s/_ssgManifest.jswww.wolframalpha.com/_next/static/W... https://www.wolframalpha.com/_next/static/WbTuK-0nortdGU19HhY8s/_ssgManifest.js — 200 — 291 B — 476 ms — h2https://www.wolframalpha.com/_next/static/images/spikey_59df5fb24a86abdf685d7dc14d5ab645.svgwww.wolframalpha.com/_next/static/i... https://www.wolframalpha.com/_next/static/images/spikey_59df5fb24a86abdf685d7dc14d5ab645.svg — 200 — 785 B — 436 ms — h2https://www.wolframalpha.com/_next/static/media/roboto-latin-italic-400.fac7cf37.woff2www.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/roboto-latin-italic-400.fac7cf37.woff2 — 200 — 11.4 KiB — 144 ms — h2https://www.wolframalpha.com/_next/static/media/roboto-latin-400.7e0ffa28.woff2www.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/roboto-latin-400.7e0ffa28.woff2 — 200 — 10.2 KiB — 136 ms — h2https://www.wolframalpha.com/_next/static/media/Lexia_W_LtIt.763dc789.woffwww.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/Lexia_W_LtIt.763dc789.woff — 200 — 31.6 KiB — 140 ms — h2https://www.wolframalpha.com/_next/static/media/Lexia_W_Lt.19c4cb27.woffwww.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/Lexia_W_Lt.19c4cb27.woff — 200 — 31.6 KiB — 132 ms — h2https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-regular.090a5408.woff2www.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-regular.090a5408.woff2 — 200 — 14.2 KiB — 136 ms — h2https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-600.96f36c1a.woff2www.wolframalpha.com/_next/static/m... https://www.wolframalpha.com/_next/static/media/source-sans-pro-v9-latin-600.96f36c1a.woff2 — 200 — 13.9 KiB — 145 ms — h2https://www.wolframalpha.com/n/v1/api/randomizerwww.wolframalpha.com/n/v1/api/rando... https://www.wolframalpha.com/n/v1/api/randomizer — 200 — 420 B — 112 ms — h2https://www.wolframalpha.com/_next/static/images/favicon_b48d893b991ff67016124a4d51822e63.icowww.wolframalpha.com/_next/static/i... https://www.wolframalpha.com/_next/static/images/favicon_b48d893b991ff67016124a4d51822e63.ico — 200 — 1.8 KiB — 113 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 725ms · 324KB · $10/mo
www.wolframalpha.com
Other
Costly
Execution 220ms
Transfer 59 KB
Unused 37%
Monthly Cost $3/mo
www.wolframalpha.com
Other
Optional
Execution 162ms
Transfer 11 KB
Monthly Cost $2/mo
www.wolframalpha.com
Other
Optional
Execution 154ms
Transfer 59 KB
Monthly Cost $2/mo
www.wolframalpha.com
Other
Optional
Execution 118ms
Transfer 195 KB
Unused 39%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 72ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.wolframalpha.com adds 220ms 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

www.wolframalpha.com takes 220ms 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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