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https://rentry.co

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
0
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
100
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.
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.

334 ms

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

547 ms

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.

0.000

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

484 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

553 ms

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
15
10 PASS 3 REVIEW
B
Third-Party Impact
42% third-party, 0 ms blocking
REVIEW
42% third-party, 0 ms blocking
Info::
Third-party code accounts for 42% of page weight (150.3 KiB of 356.0 KiB)
Info::
Third-party blocking time is low (0 ms)
58%
42%
First-party Third-party
B
JS Bundles
10 scripts, 106 KB unused
REVIEW
10 scripts, 106 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LLFS...: 61 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://rentry.co/static/codemirror/lib/codemirror...: 44 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 106 KB
106 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXET148 KB61 KB (42%)✓3rd
https://rentry.co/static/codemirror/lib/codemirror.min.js?vsson=4070 KB44 KB (63%)✓1st
https://rentry.co/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://rentry.co/static/js/jquery.min.js?vsson=4034 KB—✓1st
https://rentry.co/static/js/bootstrap.min.js?vsson=4016 KB—✓1st
https://rentry.co/static/markdownx/markdownx.min.js?vsson=402 KB—✓1st
https://rentry.co/static/codemirror/addon/mode/overlay.min.js?vsson=401 KB—✓1st
https://rentry.co/static/codemirror/mode/markdown/markdown.min.js?vsson=405 KB—✓1st
https://rentry.co/static/codemirror/mode/gfm/gfm.min.js?vsson=401 KB—✓1st
https://rentry.co/static/js/custom.min.js?vsson=402 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

B
HTTP Caching
Vary
REVIEW
Vary
Info::
Cache-Control header is set
Got: Vary
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

Vary

DirectiveValueMeaning
vary—
A+
Page Weight Budget
356 KB transferred, 18 requests
PASS
356 KB transferred, 18 requests
Info::
Page weighs 1.2 MB (356 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
356 KB / 2.4 MB budget
356 KB transferred
18 requests
0.07 g CO2 per page load
JavaScript 280.8 KiB 79%
CSS 35.5 KiB 10%
Images 20.2 KiB 6%
HTML 16.3 KiB 5%
Other 1.8 KiB 1%
Other 878 B 0%
Other 545 B 0%
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+
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 20 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
141ms total JS execution
PASS
141ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-LLFS...: 81ms CPU time
Info::
Unattributable: 60ms CPU time
Warning::
Third-party scripts: 141ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 25% Style & Layout 13% Script Parsing & Compilation 11% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXET81ms63ms13ms3rd
Unattributable60ms2ms0ms3rd
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+
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
18 resources · 356 KB · 106 KB savings available
PASS
18 resources · 356 KB · 106 KB savings available
Info::
Within 1MB page-weight target
Got: 356 KB
Info::
~106 KB of savings available
Warning::
4 third-party resources (42% of weight)
18 resources · 356.0 KiB · 4 third-party Within 1MB page-weight target
JavaScript 79% · 280.8 KiB
CSS 10% · 35.5 KiB
Image 6% · 22.1 KiB
Document 5% · 16.3 KiB
Other 0% · 1.4 KiB

~105.7 KiB of savings available

Remove unused JavaScript: 105.7 KiB
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
18 requests over 503ms
INFO
0 ms 200 ms 400 ms FCP 334 ms LCP 547 mshttps://rentry.co// https://rentry.co/ — 200 — 16.3 KiB — 195 ms — h2https://rentry.co/static/css/bootstrap.min.css?vsson=40/static/css/bootstrap.min.css?vsson... https://rentry.co/static/css/bootstrap.min.css?vsson=40 — 200 — 35.5 KiB — 23 ms — h2https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXETwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXET — 200 — 148.4 KiB — 67 ms — h2https://rentry.co/static/raccoon.webp?v=2/static/raccoon.webp?v=2 https://rentry.co/static/raccoon.webp?v=2 — 200 — 18.9 KiB — 12 ms — h2https://rentry.co/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js/cdn-cgi/scripts/5c5dd728/cloudflar... https://rentry.co/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 947 B — 6 ms — h2https://rentry.co/static/js/jquery.min.js?vsson=40/static/js/jquery.min.js?vsson=40 https://rentry.co/static/js/jquery.min.js?vsson=40 — 200 — 33.8 KiB — 22 ms — h2https://rentry.co/static/js/bootstrap.min.js?vsson=40/static/js/bootstrap.min.js?vsson=4... https://rentry.co/static/js/bootstrap.min.js?vsson=40 — 200 — 15.9 KiB — 14 ms — h2https://rentry.co/static/markdownx/markdownx.min.js?vsson=40/static/markdownx/markdownx.min.js?... https://rentry.co/static/markdownx/markdownx.min.js?vsson=40 — 200 — 2.4 KiB — 16 ms — h2https://rentry.co/static/codemirror/lib/codemirror.min.js?vsson=40/static/codemirror/lib/codemirror.m... https://rentry.co/static/codemirror/lib/codemirror.min.js?vsson=40 — 200 — 70.2 KiB — 35 ms — h2https://rentry.co/static/codemirror/addon/mode/overlay.min.js?vsson=40/static/codemirror/addon/mode/overl... https://rentry.co/static/codemirror/addon/mode/overlay.min.js?vsson=40 — 200 — 963 B — 18 ms — h2https://rentry.co/static/codemirror/mode/markdown/markdown.min.js?vsson=40/static/codemirror/mode/markdown/ma... https://rentry.co/static/codemirror/mode/markdown/markdown.min.js?vsson=40 — 200 — 5.0 KiB — 29 ms — h2https://rentry.co/static/codemirror/mode/gfm/gfm.min.js?vsson=40/static/codemirror/mode/gfm/gfm.min... https://rentry.co/static/codemirror/mode/gfm/gfm.min.js?vsson=40 — 200 — 1001 B — 30 ms — h2https://rentry.co/static/js/custom.min.js?vsson=40/static/js/custom.min.js?vsson=40 https://rentry.co/static/js/custom.min.js?vsson=40 — 200 — 2.3 KiB — 21 ms — h2https://rentry.co/static/manifest.json?vsson=40/static/manifest.json?vsson=40 https://rentry.co/static/manifest.json?vsson=40 — 200 — 878 B — 112 ms — h2https://img.youtube.com/img.youtube.com/ https://img.youtube.com/ — 404 — 1.3 KiB — 36 ms — h2data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fil…www.w3.org/2000/svg" width="16" hei... data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fil… — 200 — 0 B — 1 ms — datahttps://www.google-analytics.com/g/collect?v=2&tid=G-LLFSDKZXET&gtm=45je64h1v9167303359za200zd9167303359&_p=1776805883801&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1592420613.1776805884&frm=0&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117384405~118463261&sid=1776805883&sct=1&seg=0&dl=https%3A%2F%2Frentry.co%2F&dt=Rentry.co%20-%20Markdown%20Paste%20Service&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=465www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-LLFSDKZXET&gtm=45je64h1v9167303359za200zd9167303359&_p=1776805883801&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1592420613.1776805884&frm=0&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117384405~118463261&sid=1776805883&sct=1&seg=0&dl=https%3A%2F%2Frentry.co%2F&dt=Rentry.co%20-%20Markdown%20Paste%20Service&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=465 — 204 — 545 B — 38 ms — h2https://rentry.co/favicon.ico/favicon.ico https://rentry.co/favicon.ico — 200 — 1.8 KiB — 13 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 141ms · 148KB · $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 148 KB
Unused 42%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 60ms
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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