As others have commented, the synchronization takes a long time to load the first time.

Aside from this, some guidance is needed for non-tech users, which isn't my case, but it's difficult to explain everything to others when it comes to joining.

My question, however, is whether it would be possible to use it offline, at least view the balance, and even leave pending transactions so that when the connection is restored, those can be sent and confirmed. These transactions should be able to be done via on-chain and LN. It would also make it easier to avoid synchronizing immediately upon startup, or at least do so without preventing the user from seeing their completed transactions.

I really would like to collaborate on this, in a near future, I will for sure check the code and see if I can help in any way on this regard.