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https://www.todoist.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
6
PASS
5
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
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.

895 ms

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

2.25 s

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

0 ms

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

0.040

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

1.15 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.

2.26 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
5 PASS 6 REVIEW 1 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 128 requests
FIX
3.1 MB transferred, 128 requests
Warning::
Page weighs 5.0 MB (3.1 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 MB
Warning::
JavaScript is 601 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 601 KB
Info::
Fonts are 340 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 340 KB
Warning::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
128 requests
0.64 g CO2 per page load
Images 1.9 MiB 61%
JavaScript 600.8 KiB 19%
Fonts 340.2 KiB 11%
Other 93.7 KiB 3%
CSS 77.8 KiB 2%
Other 73.7 KiB 2%
HTML 42.6 KiB 1%
Other 893 B 0%
Other 825 B 0%
Other 403 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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
Third-Party Impact
48% third-party, 0 ms blocking
REVIEW
48% third-party, 0 ms blocking
Info::
Third-party code accounts for 48% of page weight (1.5 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
52%
48%
First-party Third-party
B
Image Optimization
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
Info::
All images are well-optimized
54 images 1.9 MB
0 oversized -0 KB
45 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1093ms total JS execution
REVIEW
1093ms total JS execution
Warning::
https://www.todoist.com/: 341ms CPU time
Info::
Unattributable: 214ms CPU time
Info::
https://www.todoist.com/_astro/ScrollTrigger.BWsqE...: 213ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-L1YQ...: 74ms CPU time
Info::
https://www.todoist.com/_astro/index.DKtf60Sy.js: 73ms CPU time
Info::
Third-party scripts: 347ms (32% of total)

Main Thread Breakdown

Other 35% Style & Layout 27% Script Evaluation 25% Rendering 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.todoist.com/341ms14ms2ms1st
Unattributable214ms13ms0ms3rd
https://www.todoist.com/_astro/ScrollTrigger.BWsqEc1I.js213ms43ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-L1YQDZCTV5&cx=c&gtm=4e6460h174ms59ms14ms3rd
https://www.todoist.com/_astro/index.DKtf60Sy.js73ms14ms0ms1st
https://www.todoist.com/_astro/ScrollTrigger.h_CMBckj.js60ms29ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-KW4J5DNZ60ms43ms13ms3rd
https://www.todoist.com/_astro/client.BWFqRWag.js59ms49ms0ms1st
C
JS Bundles
Action
45 scripts, 157 KB unused
REVIEW
45 scripts, 157 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L1YQ...: 68 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KW4...: 63 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.todoist.com/_astro/client.BWFqRWag.js: 25 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 157 KB
157 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-L1YQDZCTV5&cx=c&gtm=4e6460h1169 KB68 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW4J5DNZ160 KB63 KB (39%)✓3rd
https://www.todoist.com/_astro/client.BWFqRWag.js70 KB25 KB (36%)✓1st
https://www.todoist.com/_astro/index.DUWWnKic.js1 KB—✓1st
https://www.todoist.com/_astro/auth-urls.Tv7s_4lr.js1 KB—✓1st
https://www.todoist.com/_astro/i18n.config.B6EukBEA.js1 KB—✓1st
https://www.todoist.com/_astro/scroll-section.astro_astro_type_script_index_0_lang.Di4R8OOw.js1 KB—✓1st
https://www.todoist.com/_astro/video-player.astro_astro_type_script_index_0_lang.rpFc9mmf.js1 KB—✓1st
https://www.todoist.com/_astro/cookie-banner.astro_astro_type_script_index_0_lang.honbaO9B.js1 KB—✓1st
https://www.todoist.com/_astro/analytics.DXh8O-ll.js1 KB—✓1st

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

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

Green Hosting

No green hosting detected

B
HTTP Caching
private, no-cache, max-age=0, must-revalidate
REVIEW
private, no-cache, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: private, no-cache, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

private, no-cache, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
max-age0Cache for 0 seconds
must-revalidate—Must 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
7 fonts (340 KB)
PASS
7 fonts (340 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

340 KB total

Render-blocking

0

of 7

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 2.0 s FCP 895 ms LCP 2.2 shttps://www.todoist.com/_astro/fonts/e868cdf4720e9ea5.woff2e868cdf4720e9ea5.woff2 https://www.todoist.com/_astro/fonts/e868cdf4720e9ea5.woff2 — 47.6 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/0893f45c7065579b.woff0893f45c7065579b.woff https://www.todoist.com/_astro/fonts/0893f45c7065579b.woff — 44.7 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/449e827c608bba89.woff449e827c608bba89.woff https://www.todoist.com/_astro/fonts/449e827c608bba89.woff — 26.2 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/13ab30886e098fa8.woff13ab30886e098fa8.woff https://www.todoist.com/_astro/fonts/13ab30886e098fa8.woff — 41.6 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/5719a40fc9dc4087.woff25719a40fc9dc4087.woff2 https://www.todoist.com/_astro/fonts/5719a40fc9dc4087.woff2 — 77.8 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/1e49bd114953732c.woff21e49bd114953732c.woff2 https://www.todoist.com/_astro/fonts/1e49bd114953732c.woff2 — 83.6 KiB — 0 ms — font-display: swaphttps://www.todoist.com/_astro/fonts/6909caa7688787da.woff26909caa7688787da.woff2 https://www.todoist.com/_astro/fonts/6909caa7688787da.woff2 — 18.6 KiB — 0 ms — font-display: swap
e868cdf4720e9ea5.woff2 woff2 swap
Size 48 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
0893f45c7065579b.woff woff swap
Size 45 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
449e827c608bba89.woff woff swap
Size 26 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
13ab30886e098fa8.woff woff swap
Size 42 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
5719a40fc9dc4087.woff2 woff2 swap
Size 78 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
1e49bd114953732c.woff2 woff2 swap
Size 84 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
6909caa7688787da.woff2 woff2 swap
Size 19 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)

Fixing the unchecked items could save ~34 KB and ~68 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
128 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
32% of JavaScript execution is third-party
First-party Third-party 347ms · 328KB · €4/mo
Unattributable
Other
Costly
Execution 214ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 74ms
Transfer 169 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 160 KB
Unused 39%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 214ms and costs ~€2/month

Unattributable takes 214ms 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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