Slow 1st time website loading with basic litespeed cache option

Hi. My website is loading slow in first time user visit. The website using kadence theme. Some basic plugin like rankmath,…

The link to website: https://batdongsanhdland.com/

I notice when I disable litespeed cache, it load very fast, around 1 second. But when using litespeed plugin, it stop and start loading around 7 second.

If you go to my page through google.com. It also slow if I use litespeed cache plugin. And loading very fast if I don’t use it.

I use litespeed sever. Not using guest mode, disabled optimize page. Not using cache mobile. (Those option make my site load even slower).

Even through it make my google page speed score up to 100 point. But in reality it loading slow.

I do set up redis object cache, private cache and using litespeed crawler and litespeed optimize image. Using gzip and set up webp image on homepage myself. (I do it because only some image is replaced by webp even it optimized and changed to webp by the litespeed cache plugin).

The overall size of page is very small.

Of course it loading faster if I visited it before.

So the question is how can i speed it up for the 1st time loading ? It take me around 6-7 second to get to my site from google.

I am happy with loadtime when the site is loaded but not the first time.

The page I need help with: [log in to see the link]