onclick slow to respond

I just installed this plugin a few hours ago and like it already but I notice clicking to links takes about 10-12 seconds to connect, but on connection the page loads fast. What can I do to improve this in the setting.

Also what are the recommended optimized settings for wp-rocket and wp-fastest if I’m using this plugin as a complement, ie what the other 2 have and this plugin doesn’t that I can enable. You mentioned that this plugin is not a caching one, yet you have “clear cache” in your menu, so I should always use other plugin’s clear cache?

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