Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.82 s

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

3.35 s

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.

0.001

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

2.82 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.

3.35 s

Page Load Progression

486 ms

971 ms

1.5 s

1.9 s

2.4 s

2.9 s

3.4 s

3.9 s

Checks

9 PASS 3 REVIEW 3 FIX

Third-Party Impact

Action

94% third-party, 0 ms blocking

FIX

94% third-party, 0 ms blocking

Third-party code accounts for 94% of page weight (1.4 MiB of 1.5 MiB)

Third-party blocking time is low (0 ms)

94%

First-party Third-party

Page Weight Inventory

Action

56 resources · 1.5 MB · 0 KB savings available

FIX

56 resources · 1.5 MB · 0 KB savings available

Page weight 513 KB over 1MB target

Got: 1.5 MB Expected: ≤ 1 MB

46 third-party resources (94% of weight)

1 resources over 200KB

56 resources · 1.5 MiB · 46 third-party 512.6 KiB over 1MB target

Image 91% · 1.4 MiB

Document 5% · 74.8 KiB

Font 2% · 36.7 KiB

JavaScript 1% · 14.5 KiB

CSS 1% · 8.9 KiB

Other 0% · 3.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

56 resources			1.5 MiB

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-cache, no-store, max-age=0, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

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

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

Page Weight Budget

1.5 MB transferred, 56 requests

REVIEW

1.5 MB transferred, 56 requests

Page weighs 1.7 MB (1.5 MB transferred)

Images are 1.4 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.4 MB

56 HTTP requests

Estimated 0.31 g CO2 per page load

1.5 MB transferred

56 requests

0.31 g CO2 per page load

Images 1.4 MiB 91%

HTML 74.8 KiB 5%

Fonts 36.7 KiB 2%

JavaScript 14.5 KiB 1%

CSS 8.9 KiB 1%

Other 4.3 KiB 0%

Other 210 B 0%

0 2.4 MB 4.9 MB

Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Image Optimization

44 images, 0 KB saveable

REVIEW

44 images, 0 KB saveable

https://blogger.googleusercontent.com/img/b/U2hvZW... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

44 images 1.4 MB

0 oversized -0 KB

44 legacy format

1 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

JS Execution Cost

729ms total JS execution

REVIEW

729ms total JS execution

https://draft.blogger.com/about/?bpli=1: 379ms CPU time

Unattributable: 349ms CPU time

Third-party scripts: 349ms (48% of total)

Main Thread Breakdown

Other 57% Style & Layout 21% Parse HTML & CSS 9% Script Evaluation 8% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://draft.blogger.com/about/?bpli=1	379ms	11ms	1ms	1st
Unattributable	349ms	8ms	0ms	3rd

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

1 fonts (37 KB)

PASS

1 fonts (37 KB)

1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

37 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 37 KB

Load time 56 ms

Start 493 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)

A+

JS Bundles

2 scripts, 0 KB unused

PASS

2 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://ajax.googleapis.com/ajax/libs/webfont/1.5.10/webfont.js	7 KB	—	✓	3rd
https://draft.blogger.com/about/js/main.min.js?v=1476060773	7 KB	—	✓	1st

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

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: Google Cloud

Network Waterfall

56 requests over 1565ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

48% of JavaScript execution is third-party

First-party Third-party 349ms · 0KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	349ms	0 KB	—	€4/mo	Costly

Unattributable

Other

Costly

Execution 349ms

Transfer 0 KB

Monthly Cost €4/mo

These scripts may cost more than they're worth

Unattributable adds 349ms and costs ~€4/month

48% 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

Unattributable takes 349ms 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.