I am checking page insights for my website but getting low speed due to roboto fonts and fa-solid fonts. I want to use opensans only in my custom styles. How do I replace roboto fonts and fa-solid default fonts ?

Also I tried to remove them from nodemodules/mdbreact/dist/css/mdb.css manually but it stopped some of my css like hamburger menu is not coming.

using mdbreact decreases the page insight scores? is there any way to use it without effecting page insights score?