I just visited your website, for what it seems, you do not have a script problem, but a server hosting problem, its not the response time of the scripts that are bad, but the host itself, my advice? try to change your host, a good option is digital ocean which has SSD hosting. If this comment solves your problem, it would be good if you could pay me, if not, at least leave a comment at my profile to help me get more jobs, i would really appreciate it!!!