Skip to content
https://www.canva.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

3.26 s

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

7.77 s

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

558 ms

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.

6.28 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.

8.81 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
16
8 PASS 3 REVIEW 3 FIX
D
Third-Party Impact
Action
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (2.0 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
4920ms total JS execution
FIX
4920ms total JS execution
Warning::
https://static.canva.com/web/ad1181f53942b02c.s4le...: 1224ms CPU time
Warning::
https://static.canva.com/web/aa53b7465260c9eb.js: 1117ms CPU time
Warning::
https://www.canva.com/: 1111ms CPU time
Warning::
https://static.canva.com/web/f3cf4411110060c6.sent...: 631ms CPU time
Warning::
Unattributable: 411ms CPU time
Warning::
Third-party scripts: 3568ms (73% of total)

Main Thread Breakdown

Script Evaluation 54% Other 20% Style & Layout 17% Parse HTML & CSS 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://static.canva.com/web/ad1181f53942b02c.s4le6a.vendor.js1224ms899ms20ms3rd
https://static.canva.com/web/aa53b7465260c9eb.js1117ms1004ms77ms3rd
https://www.canva.com/1111ms32ms18ms1st
https://static.canva.com/web/f3cf4411110060c6.sentry_browser.js631ms296ms16ms3rd
Unattributable411ms14ms0ms3rd
https://www.canva.com/cdn-cgi/challenge-platform/scripts/jsd/main.js241ms230ms2ms1st
https://chunk-composing.canva.com/chunk-batch/b2c9703216bc654e.js+df74c84aec180a18.js+6c6fd1a53f5f87d1.vendor.js+649a0a1545100fc3.js+2bbbf906d2d22701.js+780e82335fb5a3eb.js+478a195d95e297dc.js+f3219372eb283ef9.js+a98b35a2b2808169.js+940d34c047e3f516.js+66ba7c171f380755.js+c831595e2c34d12c.js+ccc1b8eaea9ec1d9.js+2455273bfa86bfe3.js+bb77680c12ea9ca7.js+1b9a0955acaf92b2.js185ms156ms5ms3rd
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
C
Page Weight Budget
Action
2.1 MB transferred, 61 requests
REVIEW
2.1 MB transferred, 61 requests
Info::
Page weighs 2.4 MB (2.1 MB transferred)
Warning::
JavaScript is 620 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 620 KB
Info::
61 HTTP requests
Info::
Estimated 0.43 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
61 requests
0.43 g CO2 per page load
Other 1.2 MiB 59%
JavaScript 620.5 KiB 29%
Images 87.0 KiB 4%
HTML 54.5 KiB 3%
CSS 53.8 KiB 3%
Fonts 39.0 KiB 2%
Other 4.3 KiB 0%
Other 1.8 KiB 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
11 images, 0 KB saveable
REVIEW
11 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/ad62b20... 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.
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/ef8d0b0... 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.
11 images 87 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, 243 KB unused
REVIEW
34 scripts, 243 KB unused
Warning::
https://static.canva.com/web/aa53b7465260c9eb.js: 144 KB unused (47%)
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: 243 KB
243 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.canva.com/web/aa53b7465260c9eb.js308 KB144 KB (47%)✓3rd
https://static.canva.com/web/243a21c2549ef88e.vendor.js34 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/7fc89d1b3ce2cab2.js1 KB—✓3rd
https://www.canva.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/625261456364/main.js?13 KB—✓1st
https://static.canva.com/web/27eea0609765ee5e.strings.js12 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://static.canva.com/web/6fd8b9cb29d22a2d.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

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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.3 s LCP 7.8 shttps://static.canva.com/web/images/cff149ee1e9d2be50ac77bcd86769d05.woff2cff149ee1e9d2be50ac77bc... https://static.canva.com/web/images/cff149ee1e9d2be50ac77bcd86769d05.woff2 — 39.0 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+
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
61 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
73% of JavaScript execution is third-party
First-party Third-party 3568ms · 449KB · $47/mo
static.canva.com
Other
Costly
Execution 1224ms
Transfer 78 KB
Unused 31%
Monthly Cost $16/mo
static.canva.com
Other
Costly
Execution 1117ms
Transfer 308 KB
Unused 47%
Monthly Cost $15/mo
static.canva.com
Other
Costly
Execution 631ms
Transfer 38 KB
Unused 61%
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 411ms
Transfer 0 KB
Monthly Cost $5/mo
chunk-composing.canva.com
Other
Optional
Execution 185ms
Transfer 25 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • static.canva.com adds 1224ms and costs ~$16/month
  • static.canva.com adds 1117ms and costs ~$15/month
  • static.canva.com adds 631ms and costs ~$8/month
  • Unattributable adds 411ms and costs ~$5/month

73% 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.canva.com takes 1224ms 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 1117ms 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 631ms 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 411ms 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