First of all, this data, entitled “FID” refers to “First Input Delay”. Understand here that the FID corresponds to the fluidity with which the Internet user can interact with your site. Interactions can be in different forms. With just a click from your menu to entering information … All of these actions constitute a kind of “conversation” with your website. If this conversation is not smooth, the interlocutor will be bored. For the experience to be enjoyable, the responses on your pages should be smooth. This parameter therefore depends on the time elapsed between the user’s action and the reaction of your site. Again, Google is advised that this take less than 0.1 seconds. The best way to achieve this score is to avoid any outside script.