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https://linear.app

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
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.

1.39 s

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

5.71 s

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

1.62 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.

3.27 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.

5.72 s

Page Load Progression

1.0 s
2.1 s
3.1 s
4.1 s
5.2 s
6.2 s
7.2 s
8.3 s
Checks
14
7 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 134 requests
FIX
4.3 MB transferred, 134 requests
Critical::
Page weighs 11.9 MB (4.3 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Info::
Fonts are 503 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 503 KB
Warning::
134 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.90 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
134 requests
0.90 g CO2 per page load
JavaScript 1.4 MiB 33%
Images 1.4 MiB 33%
Fonts 503.3 KiB 11%
Other 479.9 KiB 11%
HTML 333.7 KiB 8%
CSS 122.8 KiB 3%
Other 28.5 KiB 1%
Other 2.3 KiB 0%
Other 925 B 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

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

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

F
JS Execution Cost
Action
5507ms total JS execution
FIX
5507ms total JS execution
Warning::
https://linear.app/: 1769ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 1220ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 1073ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 508ms CPU time
Warning::
Unattributable: 502ms CPU time
Warning::
Third-party scripts: 3738ms (68% of total)

Main Thread Breakdown

Script Evaluation 40% Other 29% Style & Layout 18% Script Parsing & Compilation 6% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://linear.app/1769ms76ms91ms1st
https://static.linear.app/web/_next/static/chunks/760cdbf7-7b5822af267146b5.js1220ms687ms8ms3rd
https://static.linear.app/web/_next/static/chunks/98618-7606bacba6fa6ef6.js1073ms730ms11ms3rd
https://static.linear.app/web/_next/static/chunks/webpack-b3310b8f731aa7b2.js508ms499ms1ms3rd
Unattributable502ms83ms0ms3rd
https://static.linear.app/web/_next/static/chunks/11588-31cfa8ea54236d94.js312ms42ms5ms3rd
https://static.linear.app/web/_next/static/chunks/966bdd56.9038c84279cfd3d5.js125ms96ms28ms3rd
D
JS Bundles
Action
56 scripts, 382 KB unused
FIX
56 scripts, 382 KB unused
Warning::
https://static.linear.app/web/_next/static/chunks/...: 83 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.linear.app/web/_next/static/chunks/...: 45 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.linear.app/web/_next/static/chunks/...: 45 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.linear.app/web/_next/static/chunks/...: 40 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.linear.app/web/_next/static/chunks/...: 28 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 382 KB
382 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.linear.app/web/_next/static/chunks/31720-1dc4d7f5ba420c2f.js134 KB83 KB (64%)✓3rd
https://static.linear.app/web/_next/static/chunks/65273-9d5121cb54d525f0.js55 KB45 KB (84%)✓3rd
https://static.linear.app/web/_next/static/chunks/66365-0d1cb0e00d10e089.js55 KB45 KB (82%)✓3rd
https://static.linear.app/web/_next/static/chunks/98618-7606bacba6fa6ef6.js79 KB40 KB (51%)✓3rd
https://static.linear.app/web/_next/static/chunks/22954-2868e106038b9620.js85 KB28 KB (34%)✓3rd
https://static.linear.app/web/_next/static/chunks/789a407a-bdda2a4b63247546.js57 KB28 KB (49%)✓3rd
https://e.linear.app/static/surveys.js?v=1.257.132 KB25 KB (80%)✓3rd
https://static.linear.app/web/_next/static/chunks/42997-0ff8110c6794bcf2.js33 KB24 KB (75%)✓3rd
https://static.linear.app/web/_next/static/chunks/17042-4c090e0f493a1f25.js36 KB23 KB (65%)✓3rd
https://static.linear.app/web/_next/static/chunks/98856-97d317b2caa5c2ad.js31 KB21 KB (70%)✓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

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 (2.1 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
52%
48%
First-party Third-party
B
HTTP Caching
s-maxage=120, stale-while-revalidate=31535880
REVIEW
s-maxage=120, stale-while-revalidate=31535880
Info::
Cache-Control header is set
Got: s-maxage=120, stale-while-revalidate=31535880
Info::
CDN TTL: 2 minutes (s-maxage=120)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

s-maxage=120, stale-while-revalidate=31535880

DirectiveValueMeaning
s-maxage120CDN caches for 2 minutes
stale-while-revalidate31535880Serve stale for 52 weeks while fetching fresh
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
17 images, 0 KB saveable
PASS
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 1.4 MB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (503 KB)
PASS
2 fonts (503 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

503 KB total

Render-blocking

0

of 2

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 FCP 1.4 s LCP 5.7 shttps://static.linear.app/fonts/InterVariable.woff2?v=4.1InterVariable.woff2 https://static.linear.app/fonts/InterVariable.woff2?v=4.1 — 345.1 KiB — 0 ms — font-display: swaphttps://static.linear.app/fonts/Berkeley-Mono-Variable.woff2?v=3.2Berkeley-Mono-Variable.... https://static.linear.app/fonts/Berkeley-Mono-Variable.woff2?v=3.2 — 158.1 KiB — 0 ms — font-display: swap
InterVariable.woff2 unknown swap
Size 345 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Berkeley-Mono-Variable.... unknown swap
Size 158 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~403 KB and ~806 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
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
134 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
68% of JavaScript execution is third-party
First-party Third-party 3738ms · 379KB · €65/mo
static.linear.app
Other
Costly
Execution 1220ms
Transfer 64 KB
Unused 32%
Monthly Cost €21/mo
static.linear.app
Other
Costly
Execution 1073ms
Transfer 79 KB
Unused 51%
Monthly Cost €19/mo
static.linear.app
Other
Costly
Execution 508ms
Transfer 8 KB
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 502ms
Transfer 0 KB
Monthly Cost €9/mo
static.linear.app
Other
Costly
Execution 312ms
Transfer 42 KB
Monthly Cost €5/mo
static.linear.app
Other
Optional
Execution 125ms
Transfer 186 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • static.linear.app adds 1220ms and costs ~€21/month
  • static.linear.app adds 1073ms and costs ~€19/month
  • static.linear.app adds 508ms and costs ~€9/month
  • Unattributable adds 502ms and costs ~€9/month
  • static.linear.app adds 312ms and costs ~€5/month

68% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

static.linear.app takes 1220ms 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.linear.app takes 1073ms 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 static.linear.app'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

static.linear.app takes 508ms 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 502ms 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.linear.app takes 312ms 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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