Case Study

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

● Needs urgent work
Project: DebugBear #104066
Tested: 17 Jul 2026 · daily
Devices: mobile & desktop
By: Baivab, Growth

Perf · Mobile

/ 100 · poor

Perf · Desktop

/ 100 · needs work

Mobile LCP

5.2s

target < 2.5s

Mobile TBT

4597ms

target < 200ms

Page weight

2.4 MB

mobile

The headline

On mobile this template scores 41 against 55 on desktop. Mobile is held back by main-thread blocking (TBT 4597ms) from 1.4 MB of JavaScript. Mobile LCP is slow at 5.2s.

Scores & Core Web Vitals

Metric	Mobile	Desktop	Target
Performance	41	55	90+
Accessibility	90	90	90+
Best Practices	50	54	90+
SEO	85	85	90+
Largest Contentful Paint	5.2s	2.0s	< 2.5s
Cumulative Layout Shift	0.03	0.04	< 0.1
Total Blocking Time	4597ms	1082ms	< 200ms
First Contentful Paint	3.4s	1.4s	< 1.8s
Speed Index	4.8s	1.8s	< 3.4s
Time to First Byte	1381ms	577ms	< 0.8s

Page composition

Metric	Mobile	Desktop
Total page weight	2.4 MB	2.0 MB
Images	0.6 MB	0.3 MB
JavaScript	1.4 MB	1.2 MB
Third-party bytes	1.7 MB	1.4 MB
Requests (total)	141	141
Script requests	45	42
Image requests	41	25
DOM elements	3,733	3,405
CPU time	11.9s	5.9s

Prioritised recommendations (click to expand)

P1Cut the mobile JavaScript bundle›

Mobile TBT is 4597ms from 1.4 MB of JavaScript. Defer and code-split non-critical JS, remove unused libraries, audit third-party scripts.

P2Improve mobile LCP›

Mobile LCP is 5.2s. Preload the hero image, reduce server response time and remove render-blocking CSS/JS.

Source: DebugBear lab tests, project 104066, snapshot 17 Jul 2026. Mobile: Slow 4G, Moto G Power. Lab results are single-run and vary run to run.