Performance

· 15 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

SEO

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

850 ms

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

1.04 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.

0.000

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

850 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.

1.04 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 1 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (731.3 KiB of 731.4 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

Action

17 images, 0 KB saveable

REVIEW

17 images, 0 KB saveable

https://www.drawio.com/assets/svg/home-dia2.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.drawio.com/assets/svg/home-dia1.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

17 images 433 KB

0 oversized -0 KB

17 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 Budget

731 KB transferred, 44 requests

PASS

731 KB transferred, 44 requests

Page weighs 1.7 MB (731 KB transferred)

44 HTTP requests

Estimated 0.15 g CO2 per page load

731 KB transferred

44 requests

0.15 g CO2 per page load

Images 432.9 KiB 59%

Fonts 111.0 KiB 15%

JavaScript 94.6 KiB 13%

CSS 81.8 KiB 11%

HTML 7.7 KiB 1%

Other 3.3 KiB 0%

Other 35 B 0%

Other 0 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

All text resources are properly compressed.

A+

JS Execution Cost

152ms total JS execution

PASS

152ms total JS execution

Unattributable: 97ms CPU time

https://www.drawio.com/: 55ms CPU time

Third-party scripts: 152ms (100% of total)

Main Thread Breakdown

Other 41% Style & Layout 26% Script Evaluation 16% Parse HTML & CSS 7% Rendering 5% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	97ms	2ms	0ms	3rd
https://www.drawio.com/	55ms	1ms	0ms	3rd

A+

Font Loading

5 fonts (111 KB)

PASS

5 fonts (111 KB)

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

Web fonts

111 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap

Size 14 KB

Load time 58 ms

Start 316 ms