[CLOSED] Mobile LCP Issue with Journal 3.1.13 (OpenCart 3.0.4.0)

Hi everyone,

I'm facing a performance issue related to LCP (Largest Contentful Paint) on **mobile devices** using OpenCart.

### Site Info:
- **OpenCart Version**: 3.0.4.0
- **Theme**: Journal 3.1.13
- **Hosting**: Shared hosting
- **Optimization Measures**:
- All images are served in **WebP** format
- **Lazy Load** is enabled via Journal settings
- Caching and minification handled by Journal as well
- No heavy third-party extensions

### Problem:
On mobile, the **LCP reaches 7.9 seconds**, despite other metrics being good.
- FCP: 4.9s
- Speed Index: 4.9s
- Total Blocking Time: 60ms
- CLS: 0
- Performance Score: 63/100

*Screenshot from Google PageSpeed Insights is attached.*

The desktop version performs significantly better. I'm suspecting the mobile layout or the way Journal handles mobile image rendering could be contributing, but I’m not certain.

Has anyone faced a similar issue with Journal 3 on mobile?
Any specific tweaks or solutions that helped reduce mobile LCP?

Appreciate any help or guidance.

— Gazi

You should contact the Journal support

By remove the largest above the fold image on that page.

gazikarakuzu wrote: ↑

Mon May 12, 2025 2:36 pm

The desktop version performs significantly better. I'm suspecting the mobile layout or the way Journal handles mobile image rendering could be contributing, but I’m not certain.

Mobile is always slower than desktop. Pagespeed insights (not real life data) is an estimate of what it expects it to be.
Your mobile is always slower than your desktop.

gazikarakuzu wrote: ↑

Mon May 12, 2025 2:36 pm

Has anyone faced a similar issue with Journal 3 on mobile?

Yes everyone and not just on a mobile and not just LCP.

gazikarakuzu wrote: ↑

Mon May 12, 2025 2:36 pm

Any specific tweaks or solutions that helped reduce mobile LCP?

As SohBH states above remove the largest content from above the fold on a mobile ie the big image / slider