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Claude performance report · https://infinitalab.com/blog/

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

Perf · Mobile

/ 100 · poor

Perf · Desktop

/ 100 · good

Mobile LCP

23.9s

target < 2.5s

Mobile TBT

789ms

target < 200ms

Page weight

15 MB

mobile

The headline

On mobile this template scores 47 against 91 on desktop. Mobile is held back by main-thread blocking (TBT 789ms) from 1.8 MB of JavaScript. Mobile LCP is effectively broken at 23.9s. It also carries an oversized 15 MB image payload.

Scores & Core Web Vitals

Metric	Mobile	Desktop	Target
Performance	47	91	90+
Accessibility	74	73	90+
Best Practices	73	100	90+
SEO	100	100	90+
Largest Contentful Paint	23.9s	1.7s	< 2.5s
Cumulative Layout Shift	0.01	0.01	< 0.1
Total Blocking Time	789ms	0ms	< 200ms
First Contentful Paint	2.9s	0.8s	< 1.8s
Speed Index	5.7s	1.6s	< 3.4s
Time to First Byte	337ms	21ms	< 0.8s

Page composition

Metric	Mobile	Desktop
Total page weight	15 MB	5.5 MB
Images	13 MB	5.1 MB
JavaScript	1.8 MB	0.0 MB
Third-party bytes	—	—
Requests (total)	181	30
Script requests	43	3
Image requests	80	14
DOM elements	—	—
CPU time	4.0s	0.4s

Prioritised recommendations (click to expand)

P1Cut the mobile JavaScript bundle›

Mobile TBT is 789ms from 1.8 MB of JavaScript. Defer and code-split non-critical JS, remove unused libraries, audit third-party scripts.

P1Fix broken LCP›

LCP is 23.9s on mobile. Investigate render-blocking resources, slow hero images and failed requests.

P2Compress oversized images›

Mobile loads 15 MB, almost all images. Serve WebP/AVIF, size responsive images and lazy-load. Aim under 2 MB.

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.