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https://rentry.co

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
0
REVIEW
4
PASS
11
INFO
2

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

Mobile Desktop
94
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.

1.22 s

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

1.88 s

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

271 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.

1.40 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.

3.62 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
11 PASS 4 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 355.8 KiB)
Info::
Third-party blocking time is low (0 ms)
58%
42%
First-party Third-party
C
JS Execution Cost
Action
1039ms total JS execution
REVIEW
1039ms total JS execution
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LLFS...: 315ms CPU time
Info::
Unattributable: 195ms CPU time
Info::
https://rentry.co/: 172ms CPU time
Info::
https://rentry.co/static/js/jquery.min.js?vsson=40: 170ms CPU time
Info::
https://rentry.co/static/js/custom.min.js?vsson=40: 122ms CPU time
Info::
Third-party scripts: 510ms (49% of total)

Main Thread Breakdown

Script Evaluation 46% Other 21% Style & Layout 15% Script Parsing & Compilation 11% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXET315ms236ms57ms3rd
Unattributable195ms7ms0ms3rd
https://rentry.co/172ms7ms2ms1st
https://rentry.co/static/js/jquery.min.js?vsson=40170ms135ms18ms1st
https://rentry.co/static/js/custom.min.js?vsson=40122ms55ms1ms1st
https://rentry.co/static/codemirror/lib/codemirror.min.js?vsson=4066ms36ms30ms1st
B
JS Bundles
10 scripts, 109 KB unused
REVIEW
10 scripts, 109 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LLFS...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://rentry.co/static/codemirror/lib/codemirror...: 47 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 109 KB
109 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LLFSDKZXET148 KB62 KB (42%)✓3rd
https://rentry.co/static/codemirror/lib/codemirror.min.js?vsson=4070 KB47 KB (67%)✓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 280.6 KiB 79%
CSS 35.4 KiB 10%
Images 20.2 KiB 6%
HTML 16.3 KiB 5%
Other 1.8 KiB 1%
Other 882 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+
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 · 109 KB savings available
PASS
18 resources · 356 KB · 109 KB savings available
Info::
Within 1MB page-weight target
Got: 356 KB
Info::
~109 KB of savings available
Warning::
4 third-party resources (42% of weight)
18 resources · 355.8 KiB · 4 third-party Within 1MB page-weight target
JavaScript 79% · 280.6 KiB
CSS 10% · 35.4 KiB
Image 6% · 22.1 KiB
Document 5% · 16.3 KiB
Other 0% · 1.4 KiB

~108.6 KiB of savings available

Remove unused JavaScript: 108.6 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+
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 513ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.9 shttps://rentry.co// https://rentry.co/ — 200 — 16.3 KiB — 192 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 — 35.4 KiB — 27 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 — 75 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 — 16 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 — 938 B — 9 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 — 33.7 KiB — 25 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 — 17 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 — 25 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 — 70.1 KiB — 39 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 — 918 B — 30 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 — 4.9 KiB — 28 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 — 1.1 KiB — 26 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 — 22 ms — h2https://rentry.co/static/manifest.json?vsson=40/static/manifest.json?vsson=40 https://rentry.co/static/manifest.json?vsson=40 — 200 — 882 B — 103 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 — 0 ms — datahttps://www.google-analytics.com/g/collect?v=2&tid=G-LLFSDKZXET&gtm=45je64h1v9167303359za200zd9167303359&_p=1776805870530&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=953158285.1776805871&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117884344&sid=1776805870&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=479www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-LLFSDKZXET&gtm=45je64h1v9167303359za200zd9167303359&_p=1776805870530&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=953158285.1776805871&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117884344&sid=1776805870&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=479 — 204 — 545 B — 33 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
49% of JavaScript execution is third-party
First-party Third-party 510ms · 148KB · $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 315ms
Transfer 148 KB
Unused 42%
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 195ms
Transfer 0 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 315ms and costs ~$4/month

49% 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

Google Tag Manager 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

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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