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

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.

1.02 s

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

1.02 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.

1.000

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

1.78 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.

1.02 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

12 PASS 2 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.

Image Optimization

37 images, 0 KB saveable

REVIEW

37 images, 0 KB saveable

https://goldbett.org/static/img/general/cork.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://goldbett.org/wp-content/webp-express/webp-... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

37 images 203 KB

0 oversized -0 KB

3 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

JS Execution Cost

626ms total JS execution

REVIEW

626ms total JS execution

https://goldbett.org/: 312ms CPU time

Unattributable: 244ms CPU time

https://goldbett.org/static/js/jquery-3.1.1.min.js...: 69ms CPU time

Third-party scripts: 244ms (39% of total)

Main Thread Breakdown

Other 41% Style & Layout 31% Script Evaluation 13% Rendering 8% Parse HTML & CSS 5%

Script	Total	Scripting	Parse/Compile	Party
https://goldbett.org/	312ms	4ms	2ms	1st
Unattributable	244ms	5ms	0ms	3rd
https://goldbett.org/static/js/jquery-3.1.1.min.js?ver=1.0.0	69ms	51ms	7ms	1st

A+

Page Weight Budget

362 KB transferred, 56 requests

PASS

362 KB transferred, 56 requests

Page weighs 535 KB (362 KB transferred)

56 HTTP requests

Estimated 0.07 g CO2 per page load

362 KB transferred

56 requests

0.07 g CO2 per page load

Images 203.0 KiB 56%

Fonts 73.9 KiB 20%

JavaScript 54.0 KiB 15%

HTML 16.7 KiB 5%

CSS 12.0 KiB 3%

Other 1.4 KiB 0%

Other 553 B 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

20% third-party, 0 ms blocking

PASS

20% third-party, 0 ms blocking

Third-party code accounts for 20% of page weight (73.9 KiB of 361.6 KiB)

Third-party blocking time is low (0 ms)

80%

20%

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+

Font Loading

6 fonts (74 KB)

PASS

6 fonts (74 KB)

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

Web fonts

74 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFOlCnqEu92Fr1MmWUlfBBc... woff2 swap

Size 16 KB

Load time 88 ms

Start 880 ms