As covered in other topics, this is a non issue.. the first load sends the Discourse JavaScript app to their browser. All subsequent calls are tiny. But the Discourse app needs to be sent over the wire to render anything.
The only downside is if you have a lot of drive by one-and-done users, they incur the full app load but do not reap any of the subsequent benefits when clicking or tapping around in the loaded app.
We are discussing having a super light weight 1996 era read-only HTML crawler view available to massively obsolete 2011 and earlier devices, but it is unlikely your users will have a device that old.