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https://www.sitevitals.co.uk/asset_check_test_page.html

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Last scan:
Mobile test

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Performance score ⓘ
91 /100
Good
↓ 9 points over 30 days

Performance is being held back by slow LCP.

100 75 50 25 0
Jun 19 Jul 5 Jul 25

Showing the most recent 30 checks.

Current

Performance
91
LCP
3.47s
Page weight
0.75MB

30-day movement

Performance
↓ 9
LCP
↑ 1.94s
Page weight
— 0MB

What needs attention

1 issue

What is slow

The browser identified this element as the largest visible content.

The largest delay is in Element render delay (1,308ms).

Likely cause

The resource was available, but the browser waited before painting the element.

Best first fix

Reduce render-blocking work affecting the element.

  1. 1 Reduce render-blocking CSS and JavaScript.
  2. 2 Check for animation, opacity, visibility or client-rendering delays.
  3. 3 Inline critical CSS and defer non-critical scripts.
Evidence and timing breakdown

Affected element

body > div.container

Paint phase analysis

TTFB

1ms

Discovery

0ms

Download

0ms

Render

1,308ms

Key performance metrics

Comparing with Jul 24

LCP

Largest Contentful Paint

3.47 s
Needs improvement

↑ 1.94s vs 1.53s

CLS

Cumulative Layout Shift

0.000
Good

↓ 0 vs 0.000

TBT

Total Blocking Time

0 ms
Good

↓ 0ms vs 0ms

TTFB

Time to First Byte

1 ms
Good

↓ 1ms vs 2ms

Page weight

Total transfer size

0.75 MB
Good

↓ 0MB vs 0.75MB

✓ CLS passes (0.000)
✓ Server response (TTFB) is fast (1ms)
✓ No significant render-blocking
✓ No redirects detected
✓ Images are optimised
✓ JS execution time (0ms)
✓ Total page size (0.75MB)
✓ Static assets are well-cached

LCP

How quickly the largest visible element appears.

3.47s

Target: ≤ 2.5 seconds

CLS

How visually stable the page is while loading.

0.000

Target: ≤ 0.1

TBT

How long the browser main thread is blocked.

0ms

Target: ≤ 200ms

TTFB

How quickly the server starts responding.

1ms

Target: ≤ 600ms

SI

How quickly the page becomes visually complete.

2.21s

Target: ≤ 3.4 seconds

JS execution

Time spent parsing, compiling and running JavaScript.

0ms

Target: < 2 seconds

Render blocking

Time delayed by critical CSS or JavaScript.

0ms

Target: < 200ms

Page weight

Compressed size of resources downloaded by the page.

0.75MB

Target: < 2MB

Unsized images

Images missing explicit width and height attributes.

14

Target: 0

Image saving

Potential saving from better image formats and sizing.

0bytes

Target: 0 bytes

Caching saving

Potential saving from better browser caching.

0bytes

Target: 0 bytes

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