Addings Attachments to a Document and Effect on performance

Could someone tell me how attaching 3-5 files per record could bring down my performance.

Here I am quoting from ERPNext documentation here:

To ensure there are not many files attached to a document, which can
affect your accounts performance, you can set limit as how many files
can be attached to a particular document. Click here to learn more about it.
Adding a File as an attacment

I am planning a customization where each of my Item Document(Product) will have 3-5 attachments. It is going to be a self hosted system.

Hello,

It’s not a measured phenomena but just a precationary measure. Perhaps you can attach multiple attachments to couple of item and test in your self-hosted build.

I tried it, I did not notice any lag. Thank you.