SKevo
wow! ..... Thank you for the time, It's great I will try all the links.
SKevo 2 GB RAM might not be enough
I think it's enough for me ... I have 3-4k traffic per day and I even don't use the 10% resources at the peak.
And I installed fresh flarum on another domain and its result was pretty good on the same servers .... I think the main problem is extensions and their cache. That's why I need one choice of them.