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

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.

384 ms

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

1.01 s

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

2 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.

532 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.

1.46 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.

Last-Modified header present

No Cache-Control header

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

Page Weight Budget

Action

1.7 MB transferred, 116 requests

REVIEW

1.7 MB transferred, 116 requests

Page weighs 3.0 MB (1.7 MB transferred)

Images are 1.1 MB — compress or use modern formats

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

Got: 1.1 MB

116 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.36 g CO2 per page load

1.7 MB transferred

116 requests

0.36 g CO2 per page load

Images 1.1 MiB 62%

JavaScript 464.6 KiB 26%

Fonts 92.7 KiB 5%

CSS 72.0 KiB 4%

HTML 38.5 KiB 2%

Other 3.8 KiB 0%

Other 3.3 KiB 0%

Other 962 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

Image Optimization

Action

60 images, 0 KB saveable

REVIEW

60 images, 0 KB saveable

https://99bitcoins.com/tr/wp-content/uploads/crypt... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://99bitcoins.com/de/wp-content/uploads/crypt... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://99bitcoins.com/de/wp-content/uploads/crypt... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

60 images 1.1 MB

0 oversized -0 KB

38 legacy format

3 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

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

Action

10 scripts, 173 KB unused

REVIEW

10 scripts, 173 KB unused

https://www.googletagmanager.com/gtag/js?id=G-832V...: 68 KB unused (40%)