Performance

· 14 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

Best Practices

SEO

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

541 ms

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

1.48 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.

0.033

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

541 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.

1.48 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

10 PASS 3 REVIEW

Page Weight Budget

Action

2.1 MB transferred, 31 requests

REVIEW

2.1 MB transferred, 31 requests

Page weighs 2.4 MB (2.1 MB transferred)

Images are 1.8 MB — compress or use modern formats

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

Got: 1.8 MB

31 HTTP requests

Estimated 0.43 g CO2 per page load

2.1 MB transferred

31 requests

0.43 g CO2 per page load

Images 1.8 MiB 87%

Fonts 176.5 KiB 8%

JavaScript 45.4 KiB 2%

CSS 37.0 KiB 2%

HTML 24.0 KiB 1%

Other 336 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

Action

9 images, 0 KB saveable

REVIEW

9 images, 0 KB saveable

https://krebsonsecurity.com/b-keeper/19.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://krebsonsecurity.com/b-doppel/9.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

9 images 1.8 MB

0 oversized -0 KB

9 legacy format

2 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

Page Weight Inventory

Action

31 resources · 2.1 MB · 0 KB savings available

REVIEW

31 resources · 2.1 MB · 0 KB savings available

Page weight 1.1 MB over 1MB target

Got: 2.1 MB Expected: ≤ 1 MB

5 third-party resources (5% of weight)

3 resources over 200KB

31 resources · 2.1 MiB · 5 third-party 1.1 MiB over 1MB target

Image 87% · 1.8 MiB

Font 8% · 176.5 KiB

JavaScript 2% · 45.4 KiB

CSS 2% · 37.0 KiB

Document 1% · 24.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

31 resources			2.1 MiB

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (108.5 KiB of 2.1 MiB)

Third-party blocking time is low (0 ms)

95%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

137ms total JS execution

PASS

137ms total JS execution

https://krebsonsecurity.com/: 137ms CPU time

Main Thread Breakdown

Style & Layout 42% Other 26% Script Evaluation 20% Rendering 6% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://krebsonsecurity.com/	137ms	19ms	1ms	1st

A+

Font Loading

5 fonts (177 KB)

PASS

5 fonts (177 KB)

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

Web fonts

177 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 37 KB

Load time 57 ms

Start 217 ms