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https://www.grammarly.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
36
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.91 s

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

7.54 s

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

5.48 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.

6.05 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.

31.45 s

Page Load Progression

865 ms
1.7 s
2.6 s
3.5 s
4.3 s
5.2 s
6.1 s
6.9 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 197 requests
FIX
6.9 MB transferred, 197 requests
Critical::
Page weighs 13.9 MB (6.9 MB transferred)
Warning::
JavaScript is 2.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.5 MB
Info::
Fonts are 790 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 790 KB
Warning::
197 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.5 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
197 requests
1.5 g CO2 per page load
Other 3.2 MiB 46%
JavaScript 2.5 MiB 37%
Fonts 790.4 KiB 11%
Images 208.4 KiB 3%
CSS 88.0 KiB 1%
HTML 70.1 KiB 1%
Other 21.8 KiB 0%
Other 9.3 KiB 0%
Other 5.3 KiB 0%
Other 4.1 KiB 0%
Other 0 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

D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
12439ms total JS execution
FIX
12439ms total JS execution
Warning::
https://www.grammarly.com/: 2293ms CPU time
Warning::
Unattributable: 1958ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NQ3...: 996ms CPU time
Warning::
https://static-web.grammarly.com/cms/master/_next/...: 988ms CPU time
Warning::
https://static-web.grammarly.com/cms/master/_next/...: 884ms CPU time
Warning::
Third-party scripts: 10146ms (82% of total)

Main Thread Breakdown

Script Evaluation 56% Other 20% Style & Layout 8% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.grammarly.com/2293ms54ms12ms1st
Unattributable1958ms130ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NQ3XB9&l=dataLayerAt1333996ms812ms86ms3rd
https://static-web.grammarly.com/cms/master/_next/static/chunks/framework-18871a3a7164e80f.js988ms907ms21ms3rd
https://static-web.grammarly.com/cms/master/_next/static/chunks/pages/render-b5a9ba44889e5a7a.js884ms869ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-956476927&l=dataLayerAt1333&cx=c&gtm=4e6460552ms478ms64ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-10353176&l=dataLayerAt1333&cx=c&gtm=4e6460549ms404ms68ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CBK9K2ZWWE&l=dataLayerAt1333&cx=c&gtm=4e6460499ms404ms57ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-11910764&l=dataLayerAt1333&cx=c&gtm=4e6460439ms400ms36ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-10353179&l=dataLayerAt1333&cx=c&gtm=4e6460340ms285ms52ms3rd

Showing top 10 of 31 scripts

F
JS Bundles
Action
58 scripts, 1.1 MB unused
FIX
58 scripts, 1.1 MB unused
Warning::
https://static-web.grammarly.com/cms/master/_next/...: 317 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-web.grammarly.com/cms/master/_next/...: 101 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-web.grammarly.com/cms/master/_next/...: 81 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 70 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-103...: 60 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1100 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static-web.grammarly.com/cms/master/_next/static/chunks/345-b3c0ea41a809d894.js490 KB317 KB (65%)✓3rd
https://static-web.grammarly.com/cms/master/_next/static/chunks/151-c24adecc0ed805dc.js160 KB101 KB (63%)✓3rd
https://static-web.grammarly.com/cms/master/_next/static/chunks/2665999f-54d41965add03933.js122 KB81 KB (67%)✓3rd
https://accounts.google.com/gsi/client93 KB70 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-10353179&l=dataLayerAt1333&cx=c&gtm=4e6460130 KB60 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-10353176&l=dataLayerAt1333&cx=c&gtm=4e6460130 KB60 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CBK9K2ZWWE&l=dataLayerAt1333&cx=c&gtm=4e6460167 KB60 KB (36%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NQ3XB9&l=dataLayerAt1333200 KB57 KB (28%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB56 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-956476927&l=dataLayerAt1333&cx=c&gtm=4e6460146 KB55 KB (38%)✓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

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: max-age=0, no-store, no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-store, no-cache

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
C
Image Optimization
Action
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
50 images 208 KB
0 oversized -0 KB
42 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Green Hosting

No green hosting detected

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
10 fonts (790 KB)
PASS
10 fonts (790 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

790 KB total

Render-blocking

0

of 10

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 FCP 2.9 s LCP 7.5 shttps://static-web.grammarly.com/shared/fonts/inter-regular.woff2inter-regular.woff2 https://static-web.grammarly.com/shared/fonts/inter-regular.woff2 — 91.1 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/inter-medium.woff2inter-medium.woff2 https://static-web.grammarly.com/shared/fonts/inter-medium.woff2 — 187.0 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/inter-semi-bold.woff2inter-semi-bold.woff2 https://static-web.grammarly.com/shared/fonts/inter-semi-bold.woff2 — 188.1 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/inter-bold.woff2inter-bold.woff2 https://static-web.grammarly.com/shared/fonts/inter-bold.woff2 — 97.8 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/matter-medium.woff2matter-medium.woff2 https://static-web.grammarly.com/shared/fonts/matter-medium.woff2 — 31.6 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/matter-semi-bold.woff2matter-semi-bold.woff2 https://static-web.grammarly.com/shared/fonts/matter-semi-bold.woff2 — 31.4 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/cms/master/public/fonts/MatterforGrammarlyVF.woff2MatterforGrammarlyVF.woff2 https://static-web.grammarly.com/cms/master/public/fonts/MatterforGrammarlyVF.woff2 — 33.8 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/glyph-regular.woff2glyph-regular.woff2 https://static-web.grammarly.com/shared/fonts/glyph-regular.woff2 — 35.9 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/shared/fonts/glyph-bold.woff2glyph-bold.woff2 https://static-web.grammarly.com/shared/fonts/glyph-bold.woff2 — 36.3 KiB — 0 ms — font-display: swaphttps://static-web.grammarly.com/cms/master/public/fonts/MessinaSerifWeb-VF-Upright.woff2MessinaSerifWeb-VF-Upri... https://static-web.grammarly.com/cms/master/public/fonts/MessinaSerifWeb-VF-Upright.woff2 — 57.4 KiB — 0 ms — font-display: swap
inter-regular.woff2 woff2 swap
Size 91 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
inter-medium.woff2 woff2 swap
Size 187 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
inter-semi-bold.woff2 woff2 swap
Size 188 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
inter-bold.woff2 woff2 swap
Size 98 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
matter-medium.woff2 woff2 swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
matter-semi-bold.woff2 woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MatterforGrammarlyVF.woff2 woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
glyph-regular.woff2 woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
glyph-bold.woff2 woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MessinaSerifWeb-VF-Upri... woff2 swap
Size 57 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 ~188 KB and ~376 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
16 hints, 0 missing preconnects
PASS
16 hints, 0 missing preconnects
Info::
Page uses 16 resource hint(s)

Current Resource Hints

preconnect
1
preload
+4
14
dns-prefetch
1
prefetch
—

16 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
Network Waterfall
197 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
82% of JavaScript execution is third-party
First-party Third-party 10146ms · 2479KB · $135/mo
Unattributable
Other
Costly
Execution 1958ms
Transfer 0 KB
Monthly Cost $26/mo
Google Tag Manager
Tag Manager
Costly
Execution 996ms
Transfer 200 KB
Unused 28%
Monthly Cost $13/mo
static-web.grammarly.com
Other
Costly
Execution 988ms
Transfer 54 KB
Unused 45%
Monthly Cost $13/mo
static-web.grammarly.com
Other
Costly
Execution 884ms
Transfer 1 KB
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 552ms
Transfer 146 KB
Unused 38%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 549ms
Transfer 130 KB
Unused 46%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 499ms
Transfer 167 KB
Unused 36%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 439ms
Transfer 131 KB
Unused 41%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 340ms
Transfer 130 KB
Unused 46%
Monthly Cost $5/mo
transcend-cdn.com
Other
Costly
Execution 315ms
Transfer 93 KB
Unused 48%
Monthly Cost $4/mo
analytics.tiktok.com
Other
Costly
Execution 288ms
Transfer 110 KB
Unused 51%
Monthly Cost $4/mo
transcend-cdn.com
Other
Costly
Execution 275ms
Transfer 53 KB
Unused 51%
Monthly Cost $4/mo
Microsoft Clarity
Session Replay
Costly
Execution 254ms
Transfer 26 KB
Monthly Cost $3/mo
static-web.grammarly.com
Other
Optional
Execution 188ms
Transfer 490 KB
Unused 65%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 168ms
Transfer 95 KB
Unused 36%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 159ms
Transfer 37 KB
Monthly Cost $2/mo
cdn.taboola.com
Other
Optional
Execution 152ms
Transfer 27 KB
Monthly Cost $2/mo
utt.impactcdn.com
Other
Optional
Execution 147ms
Transfer 22 KB
Monthly Cost $2/mo
j.6sc.co
Other
Optional
Execution 131ms
Transfer 19 KB
Monthly Cost $2/mo
static-web.grammarly.com
Other
Optional
Execution 118ms
Transfer 36 KB
Monthly Cost $2/mo
static-web.grammarly.com
Other
Optional
Execution 98ms
Transfer 122 KB
Unused 67%
Monthly Cost $1/mo
js.adsrvr.org
Other
Optional
Execution 89ms
Transfer 11 KB
Monthly Cost $1/mo
static-web.grammarly.com
Other
Optional
Execution 86ms
Transfer 160 KB
Unused 63%
Monthly Cost $1/mo
accounts.google.com
Other
Optional
Execution 85ms
Transfer 93 KB
Unused 75%
Monthly Cost $1/mo
LinkedIn Insight
Advertising
Optional
Execution 77ms
Transfer 19 KB
Monthly Cost $1/mo
static-web.grammarly.com
Other
Optional
Execution 73ms
Transfer 41 KB
Monthly Cost $1/mo
Bing UET
Advertising
Optional
Execution 71ms
Transfer 15 KB
Monthly Cost $1/mo
collector-21641.us.tvsquared.com
Other
Optional
Execution 62ms
Transfer 9 KB
Monthly Cost $1/mo
trc.taboola.com
Other
Optional
Execution 54ms
Transfer 2 KB
Monthly Cost $1/mo
analytics.tiktok.com
Other
Optional
Execution 51ms
Transfer 40 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1958ms and costs ~$26/month
  • Google Tag Manager adds 996ms and costs ~$13/month
  • static-web.grammarly.com adds 988ms and costs ~$13/month
  • static-web.grammarly.com adds 884ms and costs ~$12/month
  • Google Tag Manager adds 552ms and costs ~$7/month
  • Google Tag Manager adds 549ms and costs ~$7/month
  • Google Tag Manager adds 499ms and costs ~$7/month
  • Google Tag Manager adds 439ms and costs ~$6/month
  • Google Tag Manager adds 340ms and costs ~$5/month
  • transcend-cdn.com adds 315ms and costs ~$4/month
  • analytics.tiktok.com adds 288ms and costs ~$4/month
  • transcend-cdn.com adds 275ms and costs ~$4/month
  • Microsoft Clarity adds 254ms and costs ~$3/month

82% 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

Unattributable takes 1958ms 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

Google Tag Manager takes 996ms 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-web.grammarly.com takes 988ms 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-web.grammarly.com takes 884ms 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

Google Tag Manager takes 552ms 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

Google Tag Manager takes 549ms 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

Google Tag Manager takes 499ms 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

Google Tag Manager takes 439ms 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

Google Tag Manager takes 340ms 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

transcend-cdn.com takes 315ms 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

analytics.tiktok.com takes 288ms 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 analytics.tiktok.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

transcend-cdn.com takes 275ms 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 transcend-cdn.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

Microsoft Clarity takes 254ms 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

65% of static-web.grammarly.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

67% of static-web.grammarly.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

63% of static-web.grammarly.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

75% of accounts.google.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.

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