How important is WordPress Performance speed?

[Bileator]

Work on the sites the same way I’d work in the traditional setting of WordPress.
Once I'm through with editing my page, my friend recommended me to publish it as static HTML wordpress site.
He put forward a suggest trying Flatsite.com static wordpress site generator. Do you think it will work fine for me?
What are your advice? Could anybody help?

[MatterEnergy]

Every time I compared the speed of loading the pages servages was much faster tha the others.
Although FLATsite.com converts your sites to lightweight static sites, we still recommend optimizing your content and images for even better results.