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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
54
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.
81
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.

3.37 s

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

3.80 s

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

1.55 s

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.

4.20 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.

9.05 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
14
6 PASS 3 REVIEW 3 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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
10382ms total JS execution
FIX
10382ms total JS execution
Warning::
https://www.canva.com/: 3390ms CPU time
Warning::
https://static.canva.com/web/a6a5714cc6dea6f4.js: 2576ms CPU time
Warning::
https://static.canva.com/web/ad1181f53942b02c.s4le...: 1535ms CPU time
Warning::
https://static.canva.com/web/f3cf4411110060c6.sent...: 1472ms CPU time
Warning::
Unattributable: 643ms CPU time
Warning::
Third-party scripts: 10382ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 25% Style & Layout 19% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.canva.com/3390ms88ms44ms3rd
https://static.canva.com/web/a6a5714cc6dea6f4.js2576ms2290ms187ms3rd
https://static.canva.com/web/ad1181f53942b02c.s4le6a.vendor.js1535ms1128ms54ms3rd
https://static.canva.com/web/f3cf4411110060c6.sentry_browser.js1472ms596ms26ms3rd
Unattributable643ms23ms0ms3rd
https://www.canva.com/cdn-cgi/challenge-platform/scripts/jsd/main.js556ms462ms5ms3rd
https://chunk-composing.canva.com/chunk-batch/5b3d741bd5110ceb.js+9173ed5758dc2d0d.js+6c6fd1a53f5f87d1.vendor.js+eb24e23a78fb4f29.js+48eb91ce47512d3b.js+850412fa6cd97862.js+6855040416fdaf39.js+92d465e8a2e44821.js+cac02fcf8353fecd.js+9fc426d73c063d32.js+9aed52081995b5dd.js+2bce7722435560ec.js+0bfe8c16938503ff.js+aaa96fb165c482b7.js+7a486388f0cef225.js+b8f3436bd7ed82f7.js209ms170ms17ms3rd
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
Page Weight Budget
Action
2.1 MB transferred, 60 requests
REVIEW
2.1 MB transferred, 60 requests
Info::
Page weighs 2.4 MB (2.1 MB transferred)
Warning::
JavaScript is 622 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 622 KB
Info::
60 HTTP requests
Info::
Estimated 0.43 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
60 requests
0.43 g CO2 per page load
Other 1.2 MiB 59%
JavaScript 622.3 KiB 30%
Images 83.4 KiB 4%
HTML 54.5 KiB 3%
CSS 53.1 KiB 3%
Fonts 38.9 KiB 2%
Other 3.6 KiB 0%
Other 973 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://content-management-files.canva.com/5647f18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/de024e4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/4ef9c76... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/67d58c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/6122da4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/ad62b20... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/ef8d0b0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-management-files.canva.com/38c1cf7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 83 KB
0 oversized -0 KB
4 legacy format
8 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

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

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

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

C
JS Bundles
Action
34 scripts, 246 KB unused
REVIEW
34 scripts, 246 KB unused
Warning::
https://static.canva.com/web/a6a5714cc6dea6f4.js: 147 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.canva.com/web/243a21c2549ef88e.vend...: 30 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.canva.com/web/ad1181f53942b02c.s4le...: 24 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.canva.com/web/a2ac72e9800c50ea.1ul0...: 22 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.canva.com/web/f3cf4411110060c6.sent...: 22 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 246 KB
246 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.canva.com/web/a6a5714cc6dea6f4.js309 KB147 KB (48%)✓3rd
https://static.canva.com/web/243a21c2549ef88e.vendor.js35 KB30 KB (90%)✓3rd
https://static.canva.com/web/ad1181f53942b02c.s4le6a.vendor.js78 KB24 KB (31%)✓3rd
https://static.canva.com/web/a2ac72e9800c50ea.1ul071.vendor.js41 KB22 KB (56%)✓3rd
https://static.canva.com/web/f3cf4411110060c6.sentry_browser.js38 KB22 KB (61%)✓3rd
https://static.canva.com/web/fa6dd10f7fcbbd25.js1 KB—✓3rd
https://www.canva.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/625261456364/main.js?13 KB—✓3rd
https://static.canva.com/web/22fdd39dabbac02e.strings.js13 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://static.canva.com/web/a70203be46a22604.js5 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

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
1 fonts (39 KB)
PASS
1 fonts (39 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

39 KB total

Render-blocking

0

of 1

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 3.4 s LCP 3.8 shttps://static.canva.com/web/images/cff149ee1e9d2be50ac77bcd86769d05.woff2cff149ee1e9d2be50ac77bc... https://static.canva.com/web/images/cff149ee1e9d2be50ac77bcd86769d05.woff2 — 38.9 KiB — 0 ms — font-display: swap
cff149ee1e9d2be50ac77bc... woff2 swap
Size 39 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+
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+
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
60 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 10382ms · 506KB · $138/mo
www.canva.com
Other
Costly
Execution 3390ms
Transfer 54 KB
Monthly Cost $45/mo
static.canva.com
Other
Costly
Execution 2576ms
Transfer 309 KB
Unused 48%
Monthly Cost $34/mo
static.canva.com
Other
Costly
Execution 1535ms
Transfer 78 KB
Unused 31%
Monthly Cost $20/mo
static.canva.com
Other
Costly
Execution 1472ms
Transfer 38 KB
Unused 61%
Monthly Cost $20/mo
Unattributable
Other
Costly
Execution 643ms
Transfer 0 KB
Monthly Cost $9/mo
www.canva.com
Other
Costly
Execution 556ms
Transfer 1 KB
Monthly Cost $7/mo
chunk-composing.canva.com
Other
Costly
Execution 209ms
Transfer 25 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • www.canva.com adds 3390ms and costs ~$45/month
  • static.canva.com adds 2576ms and costs ~$34/month
  • static.canva.com adds 1535ms and costs ~$20/month
  • static.canva.com adds 1472ms and costs ~$20/month
  • Unattributable adds 643ms and costs ~$9/month
  • www.canva.com adds 556ms and costs ~$7/month
  • chunk-composing.canva.com adds 209ms 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.canva.com takes 3390ms 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

static.canva.com takes 2576ms 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

static.canva.com takes 1535ms 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

static.canva.com takes 1472ms 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

61% of static.canva.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

Unattributable takes 643ms 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.canva.com takes 556ms 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

chunk-composing.canva.com takes 209ms 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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