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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
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

3.24 s

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

25.12 s

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

3.25 s

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.

8.57 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.

25.27 s

Page Load Progression

1.0 s
2.0 s
3.1 s
4.1 s
5.1 s
6.1 s
7.1 s
8.2 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 192 requests
FIX
5.7 MB transferred, 192 requests
Critical::
Page weighs 11.4 MB (5.7 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
192 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
192 requests
1.2 g CO2 per page load
JavaScript 2.4 MiB 42%
Other 2.3 MiB 41%
Images 580.1 KiB 10%
Fonts 179.0 KiB 3%
HTML 85.2 KiB 1%
CSS 80.3 KiB 1%
Other 42.0 KiB 1%
Other 22.1 KiB 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 (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
41446ms total JS execution
FIX
41446ms total JS execution
Warning::
https://asana.com/_next/static/chunks/10012.c5300d...: 24673ms CPU time
Warning::
https://asana.com/_next/static/chunks/framework-e5...: 8031ms CPU time
Warning::
Unattributable: 2391ms CPU time
Warning::
https://fast.wistia.com/assets/external/publicApi....: 1605ms CPU time
Warning::
https://fast.wistia.net/assets/external/engines/hl...: 1454ms CPU time
Warning::
Third-party scripts: 41446ms (100% of total)

Main Thread Breakdown

Style & Layout 41% Script Evaluation 30% Other 22% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://asana.com/_next/static/chunks/10012.c5300d4af375cd99.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b7336396435326263373533353030323030303862623863663724673ms2627ms1ms3rd
https://asana.com/_next/static/chunks/framework-e5fb0dd7fe072789.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b733639643532626337353335303032303030386262386366378031ms5400ms19ms3rd
Unattributable2391ms207ms0ms3rd
https://fast.wistia.com/assets/external/publicApi.js@0.1.71605ms1307ms66ms3rd
https://fast.wistia.net/assets/external/engines/hls_video.js@0.1.71454ms1176ms2ms3rd
https://asana.com/1145ms83ms11ms3rd
https://t-antenna.asana.com/gtm.js?id=GTM-5KGDZGG392ms292ms67ms3rd
https://asana.com/_next/static/chunks/pages/%5B%5B...slug%5D%5D-81bcbcd4cfb801b0.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b73363964353262633735333530303230303038626238636637380ms379ms0ms3rd
https://asana.com/_next/static/chunks/28fafed5.1d9eba965cb4ac03.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b73363964353262633735333530303230303038626238636637356ms313ms23ms3rd
https://asana.com/_next/static/chunks/pages/_app-236bbd23a55394b9.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b73363964353262633735333530303230303038626238636637320ms241ms77ms3rd

Showing top 10 of 16 scripts

F
JS Bundles
Action
118 scripts, 902 KB unused
FIX
118 scripts, 902 KB unused
Warning::
https://t-antenna.asana.com/gtm.js?id=GTM-5KGDZGG: 253 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://asana.com/_next/static/chunks/pages/_app-2...: 153 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://asana.com/_next/static/chunks/59250-2eb6cc...: 88 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.net/assets/external/engines/hl...: 83 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/js/4851607934861312.js: 80 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 902 KB
902 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://t-antenna.asana.com/gtm.js?id=GTM-5KGDZGG760 KB253 KB (33%)✓3rd
https://asana.com/_next/static/chunks/pages/_app-236bbd23a55394b9.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b73363964353262633735333530303230303038626238636637238 KB153 KB (64%)✓3rd
https://asana.com/_next/static/chunks/59250-2eb6cc72db56138f.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b73363964353262633735333530303230303038626238636637124 KB88 KB (71%)✓3rd
https://fast.wistia.net/assets/external/engines/hls_video.js@0.1.7154 KB83 KB (54%)✓3rd
https://cdn.optimizely.com/js/4851607934861312.js122 KB80 KB (66%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-11757081-1&cx=c&gtm=4e6460&sign=9aff8aec907de9e02b8105dfabc23aea67ffb29027dfb7de90291be57831d90b_20260407115 KB64 KB (56%)✓3rd
https://fast.wistia.com/assets/external/publicApi.js@0.1.7138 KB60 KB (43%)✓3rd
https://asana.com/_next/static/chunks/8bdd1454-3c0bbf2a5fdc8af8.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b7336396435326263373533353030323030303862623863663739 KB34 KB (87%)✓3rd
https://fast.wistia.net/assets/external/captions.js@0.1.750 KB32 KB (65%)✓3rd
https://asana.com/_next/static/chunks/28fafed5.1d9eba965cb4ac03.js?dpl=8354dcc07986847a71dc14f1ee1c2c2a2bda738c46de2d29401737ba56b44b7336396435326263373533353030323030303862623863663757 KB28 KB (49%)✓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.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
23 images, 0 KB saveable
PASS
23 images, 0 KB saveable
Warning::
https://assets.asana.biz/transform/9c192ab3-d6e7-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.asana.biz/transform/d7a969e8-6f18-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 580 KB
0 oversized -0 KB
1 legacy format
2 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

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
4 fonts (179 KB)
PASS
4 fonts (179 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

179 KB total

Render-blocking

0

of 4

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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 3.2 s LCP 25.1 shttps://asana.com/fonts/lausanne/TWKLausanne-500.otfTWKLausanne-500.otf https://asana.com/fonts/lausanne/TWKLausanne-500.otf — 29.9 KiB — 0 ms — font-display: swaphttps://asana.com/fonts/lausanne/TWKLausanne-400.otfTWKLausanne-400.otf https://asana.com/fonts/lausanne/TWKLausanne-400.otf — 29.7 KiB — 0 ms — font-display: swaphttps://asana.com/fonts/ghost/Ghost-Medium.otfGhost-Medium.otf https://asana.com/fonts/ghost/Ghost-Medium.otf — 90.9 KiB — 0 ms — font-display: swaphttps://asana.com/fonts/lausanne/TWKLausanne-300.otfTWKLausanne-300.otf https://asana.com/fonts/lausanne/TWKLausanne-300.otf — 28.6 KiB — 0 ms — font-display: swap
TWKLausanne-500.otf otf swap
Size 30 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
TWKLausanne-400.otf otf swap
Size 30 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
Ghost-Medium.otf otf swap
Size 91 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
TWKLausanne-300.otf otf swap
Size 29 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 ~54 KB and ~108 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
18 hints, 0 missing preconnects
PASS
18 hints, 0 missing preconnects
Info::
Page uses 18 resource hint(s)

Current Resource Hints

preconnect
4
preload
+2
12
dns-prefetch
2
prefetch
—

18 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
Network Waterfall
192 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 41446ms · 1953KB · €720/mo
asana.com
Other
Costly
Execution 24673ms
Transfer 3 KB
Monthly Cost €428/mo
asana.com
Other
Costly
Execution 8031ms
Transfer 56 KB
Monthly Cost €139/mo
Unattributable
Other
Costly
Execution 2391ms
Transfer 0 KB
Monthly Cost €42/mo
fast.wistia.com
Other
Costly
Execution 1605ms
Transfer 138 KB
Unused 43%
Monthly Cost €28/mo
fast.wistia.net
Other
Costly
Execution 1454ms
Transfer 154 KB
Unused 54%
Monthly Cost €25/mo
asana.com
Other
Costly
Execution 1145ms
Transfer 85 KB
Monthly Cost €20/mo
t-antenna.asana.com
Other
Costly
Execution 392ms
Transfer 760 KB
Unused 33%
Monthly Cost €7/mo
asana.com
Other
Costly
Execution 380ms
Transfer 1 KB
Monthly Cost €7/mo
asana.com
Other
Costly
Execution 356ms
Transfer 57 KB
Unused 49%
Monthly Cost €6/mo
asana.com
Other
Costly
Execution 320ms
Transfer 238 KB
Unused 64%
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 220ms
Transfer 115 KB
Unused 56%
Monthly Cost €4/mo
Optimizely
A/B Testing
Optional
Execution 132ms
Transfer 122 KB
Unused 66%
Monthly Cost €2/mo
asana.com
Other
Optional
Execution 119ms
Transfer 49 KB
Unused 57%
Monthly Cost €2/mo
fast.wistia.net
Other
Optional
Execution 105ms
Transfer 50 KB
Unused 65%
Monthly Cost €2/mo
asana.com
Other
Optional
Execution 67ms
Transfer 124 KB
Unused 71%
Monthly Cost €1/mo
asana.com
Other
Optional
Execution 58ms
Transfer 1 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • asana.com adds 24673ms and costs ~€428/month
  • asana.com adds 8031ms and costs ~€139/month
  • Unattributable adds 2391ms and costs ~€42/month
  • fast.wistia.com adds 1605ms and costs ~€28/month
  • fast.wistia.net adds 1454ms and costs ~€25/month
  • asana.com adds 1145ms and costs ~€20/month
  • t-antenna.asana.com adds 392ms and costs ~€7/month
  • asana.com adds 380ms and costs ~€7/month
  • asana.com adds 356ms and costs ~€6/month
  • asana.com adds 320ms and costs ~€6/month
  • Google Tag Manager adds 220ms 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

asana.com takes 24673ms 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

asana.com takes 8031ms 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 2391ms 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

fast.wistia.com takes 1605ms 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

fast.wistia.net takes 1454ms 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

54% of fast.wistia.net'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

asana.com takes 1145ms 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

t-antenna.asana.com takes 392ms 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

asana.com takes 380ms 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

asana.com takes 356ms 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

asana.com takes 320ms 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

64% of asana.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

Google Tag Manager 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

56% of Google Tag Manager'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

66% of Optimizely'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

57% of asana.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

65% of fast.wistia.net'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

71% of asana.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

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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