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https://paulgraham.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
1
REVIEW
2
PASS
12
INFO
2

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

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
65
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

2.29 s

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

3.17 s

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

9 ms

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.

3.15 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.

3.17 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
17
12 PASS 2 REVIEW 1 FIX
D
Third-Party Impact
Action
88% third-party, 0 ms blocking
FIX
88% third-party, 0 ms blocking
Warning::
Third-party code accounts for 88% of page weight (84.9 KiB of 96.9 KiB)
Info::
Third-party blocking time is low (0 ms)
88%
First-party Third-party
C
Image Optimization
Action
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://sep.turbifycdn.com/ay/mobile/i/cart_2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.turbifycdn.com/aah/paulgraham/viaweb-faq... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://sep.turbifycdn.com/ay/mobile/i/menu_2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 21 KB
0 oversized -0 KB
5 legacy format
3 missing dimensions CLS risk

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

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

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+
Page Weight Budget
97 KB transferred, 16 requests
PASS
97 KB transferred, 16 requests
Info::
Page weighs 245 KB (97 KB transferred)
Info::
16 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
97 KB / 2.4 MB budget
97 KB transferred
16 requests
0.02 g CO2 per page load
JavaScript 59.2 KiB 61%
Images 21.1 KiB 22%
HTML 7.7 KiB 8%
CSS 4.6 KiB 5%
Other 4.3 KiB 4%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
265ms total JS execution
PASS
265ms total JS execution
Info::
https://ajax.googleapis.com/ajax/libs/jquery/1.11....: 159ms CPU time
Info::
Unattributable: 105ms CPU time
Warning::
Third-party scripts: 265ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 35% Style & Layout 10% Parse HTML & CSS 8% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js159ms106ms9ms3rd
Unattributable105ms5ms0ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
6 scripts, 0 KB unused
PASS
6 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js33 KB—✓3rd
https://turbifycdn.com/store/migration/loader-min-1.0.34.js?q=paulgraham&ts=1772839394&p=1&h=order.store.turbify.net12 KB—✓3rd
https://sep.turbifycdn.com/ay/mobile/js/slick_2.js8 KB—✓3rd
https://sep.turbifycdn.com/ay/mobile/js/jquery.mmenu_1.min.js4 KB—✓3rd
https://sep.turbifycdn.com/ay/mobile/js/mobile-scripts_3.js2 KB—✓3rd
https://store1.turbifycdn.com/P/MTFILE/paulgraham/floatingcart/js/fc/1776890955043___fc_paulgraham.js?loader_ver=combine0 KB—✓3rd
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
Page Weight Inventory
16 resources · 97 KB · 0 KB savings available
PASS
16 resources · 97 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 97 KB
Warning::
14 third-party resources (88% of weight)
16 resources · 96.9 KiB · 14 third-party Within 1MB page-weight target
JavaScript 61% · 59.2 KiB
Image 26% · 25.4 KiB
Document 8% · 7.7 KiB
CSS 5% · 4.6 KiB
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
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: private, max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=3600

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
16 requests over 1089ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.3 s LCP 3.2 shttps://paulgraham.com// https://paulgraham.com/ — 200 — 7.7 KiB — 335 ms — h2https://sep.turbifycdn.com/ay/mobile/css/css-mobile_5.csssep.turbifycdn.com/ay/mobile/css/cs... https://sep.turbifycdn.com/ay/mobile/css/css-mobile_5.css — 200 — 2.8 KiB — 132 ms — h2https://www.virtumundo.com/images/spacer.gifwww.virtumundo.com/images/spacer.gi... https://www.virtumundo.com/images/spacer.gif — -1 — 0 B — 514 ms — https://sep.turbifycdn.com/ay/mobile/css/mmenu_2.csssep.turbifycdn.com/ay/mobile/css/mm... https://sep.turbifycdn.com/ay/mobile/css/mmenu_2.css — 200 — 1.8 KiB — 133 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js — 200 — 33.3 KiB — 117 ms — h2https://sep.turbifycdn.com/ay/mobile/i/menu_2.pngsep.turbifycdn.com/ay/mobile/i/menu... https://sep.turbifycdn.com/ay/mobile/i/menu_2.png — 200 — 1.9 KiB — 133 ms — h2https://sep.turbifycdn.com/ay/mobile/i/cart_2.pngsep.turbifycdn.com/ay/mobile/i/cart... https://sep.turbifycdn.com/ay/mobile/i/cart_2.png — 200 — 2.4 KiB — 134 ms — h2https://s.turbifycdn.com/aah/paulgraham/viaweb-faq-3.gifs.turbifycdn.com/aah/paulgraham/via... https://s.turbifycdn.com/aah/paulgraham/viaweb-faq-3.gif — 200 — 1.9 KiB — 63 ms — h2https://s.turbifycdn.com/aah/paulgraham/index-22.gifs.turbifycdn.com/aah/paulgraham/ind... https://s.turbifycdn.com/aah/paulgraham/index-22.gif — 200 — 11.8 KiB — 64 ms — h2https://sep.turbifycdn.com/ay/mobile/i/mobile-back-to-top_2.pngsep.turbifycdn.com/ay/mobile/i/mobi... https://sep.turbifycdn.com/ay/mobile/i/mobile-back-to-top_2.png — 200 — 3.1 KiB — 22 ms — h2https://turbifycdn.com/store/migration/loader-min-1.0.34.js?q=paulgraham&ts=1772839394&p=1&h=order.store.turbify.netturbifycdn.com/store/migration/load... https://turbifycdn.com/store/migration/loader-min-1.0.34.js?q=paulgraham&ts=1772839394&p=1&h=order.store.turbify.net — 200 — 11.7 KiB — 27 ms — h2https://sep.turbifycdn.com/ay/mobile/js/slick_2.jssep.turbifycdn.com/ay/mobile/js/sli... https://sep.turbifycdn.com/ay/mobile/js/slick_2.js — 200 — 8.0 KiB — 24 ms — h2https://sep.turbifycdn.com/ay/mobile/js/jquery.mmenu_1.min.jssep.turbifycdn.com/ay/mobile/js/jqu... https://sep.turbifycdn.com/ay/mobile/js/jquery.mmenu_1.min.js — 200 — 4.0 KiB — 22 ms — h2https://sep.turbifycdn.com/ay/mobile/js/mobile-scripts_3.jssep.turbifycdn.com/ay/mobile/js/mob... https://sep.turbifycdn.com/ay/mobile/js/mobile-scripts_3.js — 200 — 2.0 KiB — 25 ms — h2https://store1.turbifycdn.com/P/MTFILE/paulgraham/floatingcart/js/fc/1776890955043___fc_paulgraham.js?loader_ver=combinestore1.turbifycdn.com/P/MTFILE/paul... https://store1.turbifycdn.com/P/MTFILE/paulgraham/floatingcart/js/fc/1776890955043___fc_paulgraham.js?loader_ver=combine — 200 — 232 B — 446 ms — h2https://paulgraham.com/favicon.ico/favicon.ico https://paulgraham.com/favicon.ico — 200 — 4.3 KiB — 109 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 265ms · 33KB · $2/mo
ajax.googleapis.com
Other
Optional
Execution 159ms
Transfer 33 KB
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 105ms
Transfer 0 KB
Monthly Cost $1/mo

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

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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