And I used to worry about the size of the vault may affect the performance, because I was planing to put all notes in one vault.
But the result shows that this worry is not necessary.
And I also realized, only for my case, connecting all notes may look fantastic, but it will actually distract my attention. The Cons is larger than the Pros. And I don’t have to put all the notes in one vault at all.
But based on what principle to split the vault is a very good topic to study. I used to read the Chinese version of a book named 「結果を出す人」はノートに何を書いているのか. It shows a very simple method: using both individual note book and the Carrier Notebook for different purposes. The former is for working in hand, the later is mainly for information. And the individual note book will be merged into the Carrier Notebook when the job in hand is done.
Hope this will be helpful.