Spam click.... click once = text fully appears; click again and go to next dialogue. If you spam well enough you skip past most of the dialogue.

You can also spam spacebar for the same and you can combine spacebar + clicking. 

Do be aware of where you click etc. though as you can accidentally pick an option you didn't mean to. Also this can in very rare cases lead to softlocks with buttons not appearing. Most (if not all) of the places where this could happen have been patched at this point though. Hasn't happened in quite a while for me at least.

Also this is Unity, not renpy... it's not exactly a 5second change more like an entire rework of the engine >...>

Edit: I also kind of forgot about the whole manual/auto/skip dialogue button top left that you can click when you're talking. (skip setting makes the text appear instantly already)

But uh... to come back to the original reason... There is basically no content for non sharing that doesn't also exist for sharing. You just miss out on the additional sharing scenes. Same thing with the love route. You just miss out on most of the game going with it. The few scenes that do currently exist for those routes are also locked behind specific choices with other characters and are very missable.

Please note while convenient, playing this way can be buggy. For example the first shower photo and her conversation the day after can glitch out playing this way. So best to wait a couple of days before doing this.