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.

934 ms

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

1.70 s

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

5 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.

934 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.

1.70 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

8 PASS 4 REVIEW 1 FIX

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.

Page Weight Budget

1.4 MB transferred, 39 requests

REVIEW

1.4 MB transferred, 39 requests

Page weighs 2.0 MB (1.4 MB transferred)

Images are 1.0 MB — compress or use modern formats

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

Got: 1.0 MB

39 HTTP requests

Estimated 0.30 g CO2 per page load

1.4 MB transferred

39 requests

0.30 g CO2 per page load

Images 1.0 MiB 74%

JavaScript 289.1 KiB 20%

Fonts 65.3 KiB 5%

CSS 14.2 KiB 1%

HTML 6.5 KiB 0%

Other 2.5 KiB 0%

Other 406 B 0%

0 2.4 MB 4.9 MB

Under budget

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

26 images, 0 KB saveable

REVIEW

26 images, 0 KB saveable

https://obsproject.com/assets/images/features-new/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

26 images 1.0 MB

0 oversized -0 KB

26 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 Bundles

3 scripts, 129 KB unused

REVIEW

3 scripts, 129 KB unused

https://www.googletagmanager.com/gtag/js?id=G-3C9P...: 66 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=UA-346...: 63 KB unused (54%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 129 KB

129 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-3C9PHRV452&cx=c&gtm=4e64h1	151 KB	66 KB (43%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=UA-34644124-1	117 KB	63 KB (54%)	✓	3rd
https://www.google-analytics.com/analytics.js	21 KB	—	✓	3rd

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

Page Weight Inventory

Action

39 resources · 1.4 MB · 129 KB savings available

REVIEW

39 resources · 1.4 MB · 129 KB savings available

Page weight 418 KB over 1MB target

Got: 1.4 MB Expected: ≤ 1 MB

~129 KB of savings available

11 third-party resources (25% of weight)

3 resources over 200KB

39 resources · 1.4 MiB · 11 third-party 418.4 KiB over 1MB target

Image 74% · 1.0 MiB

JavaScript 20% · 289.1 KiB

Font 5% · 65.3 KiB

CSS 1% · 14.2 KiB

Document 0% · 6.5 KiB

Other 0% · 406 B

~128.5 KiB of savings available

Remove unused JavaScript: 128.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

39 resources			1.4 MiB

Third-Party Impact

25% third-party, 0 ms blocking

PASS

25% third-party, 0 ms blocking

Third-party code accounts for 25% of page weight (363.3 KiB of 1.4 MiB)

Third-party blocking time is low (0 ms)

75%

25%

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

286ms total JS execution

PASS

286ms total JS execution

https://obsproject.com/: 139ms CPU time

Unattributable: 90ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-3C9P...: 57ms CPU time

Third-party scripts: 147ms (51% of total)

Main Thread Breakdown

Script Evaluation 32% Style & Layout 31% Other 24% Script Parsing & Compilation 8% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://obsproject.com/	139ms	16ms	1ms	1st
Unattributable	90ms	18ms	0ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-3C9PHRV452&cx=c&gtm=4e64h1	57ms	41ms	15ms	3rd

A+

Font Loading

6 fonts (65 KB)

PASS

6 fonts (65 KB)

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

Web fonts

65 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

mem5YaGs126MiZpBA-UN8rs... woff2 swap

Size 14 KB

Load time 31 ms

Start 453 ms