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

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
4
PASS
8
INFO
2

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

40
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.
96
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.

3.94 s

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

6.27 s

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

1.69 s

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.

5.03 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.

13.71 s

Page Load Progression

681 ms
1.4 s
2.0 s
2.7 s
3.4 s
4.1 s
4.8 s
5.4 s
Checks
16
8 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
18302ms total JS execution
FIX
18302ms total JS execution
Warning::
https://framerusercontent.com/sites/3nD48sbvLWIxKb...: 7452ms CPU time
Warning::
https://cal.com/: 3687ms CPU time
Warning::
Unattributable: 2529ms CPU time
Warning::
https://framerusercontent.com/sites/3nD48sbvLWIxKb...: 2371ms CPU time
Warning::
https://widget.senja.io/widget/6a0c4b74-527a-4058-...: 1484ms CPU time
Warning::
Third-party scripts: 18302ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 20% Style & Layout 19% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/react.DY5lTyYe.mjs7452ms6622ms3ms3rd
https://cal.com/3687ms184ms21ms3rd
Unattributable2529ms235ms0ms3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/motion.CBTXMTcY.mjs2371ms1294ms1ms3rd
https://widget.senja.io/widget/6a0c4b74-527a-4058-bded-8a358821c1a0/platform.js1484ms277ms45ms3rd
https://events.framer.com/script?v=2246ms196ms3ms3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/framer.BX-w_ySH.mjs127ms95ms7ms3rd
https://eu-assets.i.posthog.com/static/array.js124ms96ms26ms3rd
https://ddwl4m2hdecbv.cloudfront.net/b/46DJ4HWPMG61/46DJ4HWPMG61.js.gz111ms103ms5ms3rd
https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js89ms60ms5ms3rd

Showing top 10 of 11 scripts

C
Page Weight Budget
Action
1.7 MB transferred, 154 requests
REVIEW
1.7 MB transferred, 154 requests
Info::
Page weighs 6.7 MB (1.7 MB transferred)
Warning::
JavaScript is 749 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 749 KB
Info::
Fonts are 371 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 371 KB
Warning::
154 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
154 requests
0.35 g CO2 per page load
JavaScript 748.7 KiB 44%
Fonts 370.8 KiB 22%
Images 314.7 KiB 18%
HTML 279.1 KiB 16%
Other 2.2 KiB 0%
Other 1.5 KiB 0%
Other 1.2 KiB 0%
CSS 1.1 KiB 0%
Other 378 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
All images are well-optimized
44 images 315 KB
0 oversized -0 KB
23 legacy format
0 missing dimensions CLS risk
B
JS Bundles
38 scripts, 145 KB unused
REVIEW
38 scripts, 145 KB unused
Warning::
https://framerusercontent.com/sites/3nD48sbvLWIxKb...: 64 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu-assets.i.posthog.com/static/array.js: 46 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://widget.senja.io/widget/6a0c4b74-527a-4058-...: 34 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 145 KB
145 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/framer.BX-w_ySH.mjs126 KB64 KB (51%)3rd
https://eu-assets.i.posthog.com/static/array.js65 KB46 KB (72%)3rd
https://widget.senja.io/widget/6a0c4b74-527a-4058-bded-8a358821c1a0/platform.js82 KB34 KB (42%)3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/v7M7xdOQx.CaLP-DSw.mjs2 KB3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/HDVo4ShKB.DV5dfM5z.mjs18 KB3rd
https://cal.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/react.DY5lTyYe.mjs44 KB3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/rolldown-runtime.C3b5wMYK.mjs1 KB3rd
https://ddwl4m2hdecbv.cloudfront.net/b/46DJ4HWPMG61/46DJ4HWPMG61.js.gz10 KB3rd
https://framerusercontent.com/sites/3nD48sbvLWIxKbF7A73bty/motion.CBTXMTcY.mjs49 KB3rd

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
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
publicAny cache may store this response
max-age0Cache for 0 seconds
must-revalidateMust recheck with server after expiry
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
12 fonts (371 KB)
PASS
12 fonts (371 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

371 KB total

Render-blocking

0

of 12

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 FCP 3.9 s LCP 6.3 shttps://framerusercontent.com/assets/s54IhrL41P21N6p7LExqluES5w.woff2s54IhrL41P21N6p7LExqluE... https://framerusercontent.com/assets/s54IhrL41P21N6p7LExqluES5w.woff2 — 61.6 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/vQyevYAyHtARFwPqUzQGpnDs.woff2vQyevYAyHtARFwPqUzQGpnD... https://framerusercontent.com/assets/vQyevYAyHtARFwPqUzQGpnDs.woff2 — 27.4 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/dcBhZgAFiyqqQO8SkGjomdakHJ8.woff2dcBhZgAFiyqqQO8SkGjomda... https://framerusercontent.com/assets/dcBhZgAFiyqqQO8SkGjomdakHJ8.woff2 — 25.1 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/calsans/v2/fdN99sWUv3gWqXxqqRBctFs.woff2fdN99sWUv3gWqXxqqRBctFs... https://fonts.gstatic.com/s/calsans/v2/fdN99sWUv3gWqXxqqRBctFs.woff2 — 21.0 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/P2duH7wVRqqnKRek7vOcXAA9g.woff2P2duH7wVRqqnKRek7vOcXAA... https://framerusercontent.com/assets/P2duH7wVRqqnKRek7vOcXAA9g.woff2 — 40.6 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/d3tHnaQIAeqiE5hGcRw4mmgWYU.woff2d3tHnaQIAeqiE5hGcRw4mmg... https://framerusercontent.com/assets/d3tHnaQIAeqiE5hGcRw4mmgWYU.woff2 — 28.0 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/yDtI2UI8XcEg1W2je9XPN3Noo.woff2yDtI2UI8XcEg1W2je9XPN3N... https://framerusercontent.com/assets/yDtI2UI8XcEg1W2je9XPN3Noo.woff2 — 28.0 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_AP2_ROW4.woff2L0xuDF4xlVMF-BfR8bXMIhJ... https://fonts.gstatic.com/s/robotomono/v31/L0xuDF4xlVMF-BfR8bXMIhJHg45mwgGEFl0_AP2_ROW4.woff2 — 12.7 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/yoAzpZteCckGFkoe6BbYQH90ReE.woff2yoAzpZteCckGFkoe6BbYQH9... https://framerusercontent.com/assets/yoAzpZteCckGFkoe6BbYQH90ReE.woff2 — 25.9 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/JnSOH7RupDCN6KVnC1gWkQOKE.woff2JnSOH7RupDCN6KVnC1gWkQO... https://framerusercontent.com/assets/JnSOH7RupDCN6KVnC1gWkQOKE.woff2 — 26.0 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 0 ms — font-display: swaphttps://framerusercontent.com/assets/GrgcKwrN6d3Uz8EwcLHZxwEfC4.woff2GrgcKwrN6d3Uz8EwcLHZxwE... https://framerusercontent.com/assets/GrgcKwrN6d3Uz8EwcLHZxwEfC4.woff2 — 27.3 KiB — 0 ms — font-display: swap
s54IhrL41P21N6p7LExqluE... woff2 swap
Size 62 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
vQyevYAyHtARFwPqUzQGpnD... woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
dcBhZgAFiyqqQO8SkGjomda... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fdN99sWUv3gWqXxqqRBctFs... woff2 swap
Size 21 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
P2duH7wVRqqnKRek7vOcXAA... woff2 swap
Size 41 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
d3tHnaQIAeqiE5hGcRw4mmg... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
yDtI2UI8XcEg1W2je9XPN3N... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
L0xuDF4xlVMF-BfR8bXMIhJ... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
yoAzpZteCckGFkoe6BbYQH9... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
JnSOH7RupDCN6KVnC1gWkQO... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GrgcKwrN6d3Uz8EwcLHZxwE... woff2 swap
Size 27 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
1
preload
dns-prefetch
prefetch

1 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
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
154 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 18302ms · 680KB · €199/mo
framerusercontent.com
Other
Costly
Execution 7452ms
Transfer 44 KB
Monthly Cost €81/mo
cal.com
Other
Costly
Execution 3687ms
Transfer 277 KB
Monthly Cost €40/mo
Unattributable
Other
Costly
Execution 2529ms
Transfer 0 KB
Monthly Cost €27/mo
framerusercontent.com
Other
Costly
Execution 2371ms
Transfer 49 KB
Monthly Cost €26/mo
widget.senja.io
Other
Costly
Execution 1484ms
Transfer 82 KB
Unused 42%
Monthly Cost €16/mo
events.framer.com
Other
Costly
Execution 246ms
Transfer 8 KB
Monthly Cost €3/mo
framerusercontent.com
Other
Optional
Execution 127ms
Transfer 126 KB
Unused 51%
Monthly Cost €1/mo
eu-assets.i.posthog.com
Other
Optional
Execution 124ms
Transfer 65 KB
Unused 72%
Monthly Cost €1/mo
ddwl4m2hdecbv.cloudfront.net
Other
Optional
Execution 111ms
Transfer 10 KB
Monthly Cost €1/mo
ajax.googleapis.com
Other
Optional
Execution 89ms
Transfer 6 KB
Monthly Cost €1/mo
Twitter/X Pixel
Advertising
Optional
Execution 81ms
Transfer 13 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • framerusercontent.com adds 7452ms and costs ~€81/month
  • cal.com adds 3687ms and costs ~€40/month
  • Unattributable adds 2529ms and costs ~€27/month
  • framerusercontent.com adds 2371ms and costs ~€26/month
  • widget.senja.io adds 1484ms and costs ~€16/month
  • events.framer.com adds 246ms 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

framerusercontent.com takes 7452ms 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

cal.com takes 3687ms 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 2529ms 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

framerusercontent.com takes 2371ms 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

widget.senja.io takes 1484ms 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

events.framer.com takes 246ms 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

51% of framerusercontent.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

72% of eu-assets.i.posthog.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.

Send Feedback