[Brajeshwar]

I don’t have extensive experience on this yet, but I believe this is also a solved issue (using custom fonts). Serve the font-family from the same source as the website, preload only the primary font-style (say “normal”), and custom-pick the font to just the Latin subset. That should be fast enough that almost none will notice, except for the pedantic developers like us (personally, I can forgive that).

Henceforth, let the others (styles, variable, etc) kick in as needed.

[wonger_]

Yep, that's what I do on my website (except for the Latin subset). Still noticeable on spotty connections, like on a phone in a dead zone.