Skip to content
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
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

4.72 s

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

22.87 s

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

6.07 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.

8.31 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.

22.98 s

Page Load Progression

872 ms
1.7 s
2.6 s
3.5 s
4.4 s
5.2 s
6.1 s
7.0 s
Checks
14
7 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 101 requests
FIX
3.3 MB transferred, 101 requests
Warning::
Page weighs 10.0 MB (3.3 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 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::
101 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
101 requests
0.69 g CO2 per page load
JavaScript 1.3 MiB 40%
Images 700.7 KiB 21%
Fonts 503.2 KiB 15%
Other 353.4 KiB 10%
HTML 333.7 KiB 10%
CSS 117.5 KiB 3%
Other 28.1 KiB 1%
Other 2.3 KiB 0%
Other 918 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

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
18624ms total JS execution
FIX
18624ms total JS execution
Warning::
https://linear.app/: 5953ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 3746ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 2687ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 1924ms CPU time
Warning::
https://static.linear.app/web/_next/static/chunks/...: 1585ms CPU time
Warning::
Third-party scripts: 12671ms (68% of total)

Main Thread Breakdown

Script Evaluation 42% Other 27% Style & Layout 17% Script Parsing & Compilation 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://linear.app/5953ms199ms376ms1st
https://static.linear.app/web/_next/static/chunks/98618-7606bacba6fa6ef6.js3746ms2775ms45ms3rd
https://static.linear.app/web/_next/static/chunks/760cdbf7-7b5822af267146b5.js2687ms2325ms36ms3rd
https://static.linear.app/web/_next/static/chunks/11588-31cfa8ea54236d94.js1924ms280ms27ms3rd
https://static.linear.app/web/_next/static/chunks/webpack-b3310b8f731aa7b2.js1585ms1419ms3ms3rd
Unattributable1420ms91ms0ms3rd
https://static.linear.app/web/_next/static/chunks/966bdd56.9038c84279cfd3d5.js547ms369ms109ms3rd
https://static.linear.app/web/_next/static/chunks/22954-2868e106038b9620.js519ms463ms55ms3rd
https://static.linear.app/web/_next/static/chunks/31720-1dc4d7f5ba420c2f.js74ms2ms71ms3rd
https://static.linear.app/web/_next/static/chunks/4c6ce9c9.a3c849de6338b039.js64ms20ms43ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
49 scripts, 381 KB unused
FIX
49 scripts, 381 KB unused
Warning::
https://static.linear.app/web/_next/static/chunks/...: 82 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/...: 39 KB unused (50%)
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: 381 KB
381 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.linear.app/web/_next/static/chunks/31720-1dc4d7f5ba420c2f.js132 KB82 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 KB39 KB (50%)✓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 KB27 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 (71%)✓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
59% third-party, 0 ms blocking
REVIEW
59% third-party, 0 ms blocking
Warning::
Third-party code accounts for 59% of page weight (1.9 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
41%
59%
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
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 701 KB
0 oversized -0 KB
1 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 4.7 s LCP 22.9 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
3
preload
5
dns-prefetch
—
prefetch
—

8 resource hints configured

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
101 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 12671ms · 704KB · €220/mo
static.linear.app
Other
Costly
Execution 3746ms
Transfer 79 KB
Unused 50%
Monthly Cost €65/mo
static.linear.app
Other
Costly
Execution 2687ms
Transfer 64 KB
Unused 32%
Monthly Cost €47/mo
static.linear.app
Other
Costly
Execution 1924ms
Transfer 42 KB
Monthly Cost €33/mo
static.linear.app
Other
Costly
Execution 1585ms
Transfer 8 KB
Monthly Cost €28/mo
Unattributable
Other
Costly
Execution 1420ms
Transfer 0 KB
Monthly Cost €25/mo
static.linear.app
Other
Costly
Execution 547ms
Transfer 186 KB
Monthly Cost €9/mo
static.linear.app
Other
Costly
Execution 519ms
Transfer 85 KB
Unused 34%
Monthly Cost €9/mo
static.linear.app
Other
Optional
Execution 74ms
Transfer 132 KB
Unused 64%
Monthly Cost €1/mo
static.linear.app
Other
Optional
Execution 64ms
Transfer 18 KB
Monthly Cost €1/mo
static.linear.app
Other
Optional
Execution 54ms
Transfer 12 KB
Monthly Cost €1/mo
static.linear.app
Other
Optional
Execution 52ms
Transfer 79 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • static.linear.app adds 3746ms and costs ~€65/month
  • static.linear.app adds 2687ms and costs ~€47/month
  • static.linear.app adds 1924ms and costs ~€33/month
  • static.linear.app adds 1585ms and costs ~€28/month
  • Unattributable adds 1420ms and costs ~€25/month
  • static.linear.app adds 547ms and costs ~€9/month
  • static.linear.app adds 519ms and costs ~€9/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 3746ms 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

50% 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 2687ms 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 1924ms 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 1585ms 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 1420ms 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 547ms 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 519ms 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

64% 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

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