How to solve "page cache is detected but the server response time is time slow" and "you should use a persistent object cache"

I have an error in WordPress sitehealth like that, what should I do
Webpanel : Cyberpanel
CMS : wordpress
OS : AlmaLinux8
Plugin cache : LiteSpeed

Please help me sirr, i need the problem solve
Thanks you

Maybe you need a stronger server. How many RAM and CPU cores do you have?
Object cache > Redis
I only use Debian 11/12 or Ubuntu. These OS use less RAM than AlmaLinux

this is my spec on my VPS
can you help me, my problem sir

What kind of CPU are you using?
Try to test it with this command:

curl -sL -d -i -n | bash -s -- -fni

Then post the result here