Hi, I’m so sorry for replying after months, but I haven’t looked at Medium for a while, I hope that this comment will help you or any reader out there.

If you preload a module, you’re still splitting it into a separate chunk, so the user could have to wait a few milliseconds to have at least the first (visited) route loaded. On the other hand, if you don’t split the module into a lazy-one, it will be part of the “main” JavaScript bundle and the user could wait a bit longer to see the first “paint” :)