Case Study

Claude performance report · https://infinitalab.com/case-study/

● Needs work
Source: Claude · PageSpeed Insights
Tested: 3 Aug 2026 · daily
Devices: mobile & desktop
By: Baivab, Growth

Perf · Mobile

/ 100 · needs work

Perf · Desktop

/ 100 · good

Mobile LCP

5.7s

target < 2.5s

Mobile TBT

694ms

target < 200ms

Page weight

3.2 MB

mobile

The headline

On mobile this template scores 52 against 98 on desktop. Mobile is held back by main-thread blocking (TBT 694ms) from 1.8 MB of JavaScript. Mobile LCP is slow at 5.7s.

Scores & Core Web Vitals

Metric	Mobile	Desktop	Target
Performance	52	98	90+
Accessibility	87	90	90+
Best Practices	73	100	90+
SEO	92	92	90+
Largest Contentful Paint	5.7s	0.9s	< 2.5s
Cumulative Layout Shift	0.09	0.03	< 0.1
Total Blocking Time	694ms	0ms	< 200ms
First Contentful Paint	2.9s	0.7s	< 1.8s
Speed Index	5.0s	0.9s	< 3.4s
Time to First Byte	176ms	6ms	< 0.8s

Page composition

Metric	Mobile	Desktop
Total page weight	3.2 MB	0.5 MB
Images	0.6 MB	0.3 MB
JavaScript	1.8 MB	0.0 MB
Third-party bytes	—	—
Requests (total)	143	28
Script requests	43	3
Image requests	40	12
DOM elements	—	—
CPU time	3.7s	0.4s

Prioritised recommendations (click to expand)

P1Cut the mobile JavaScript bundle›

Mobile TBT is 694ms from 1.8 MB of JavaScript. Defer and code-split non-critical JS, remove unused libraries, audit third-party scripts.

P2Improve mobile LCP›

Mobile LCP is 5.7s. Preload the hero image, reduce server response time and remove render-blocking CSS/JS.

Source: Claude via Google PageSpeed Insights, 3 Aug 2026. Mobile: Slow 4G, Moto G Power. Lab results are single-run and vary run to run.