Front page loading issue

Hi I was forced to move my Wordpress to new server and therefore a lot of changes had to be done specially in cache setups. I did change the cache plugin to Litespeed. The configure includes also Cloudflare and Wordfence. Theme is not working totally perfect yet. I had issues with mobile menus. Buy disabling Guest Optimization menus started to work (showed empty menu with this optimization on). Now the theme is having a minor issue left. It is not loading the front page properly always. I assume it is because all this jazz around cache settings but I might be wrong. The area under featured slider is empty for up to 10 seconds or there is a huge area left unfilled: there is a big space between the slider and the content. Time to time (after a while) the front page loads ok, but not always. I wish to have help what setting could fix this issue.