Thank you Howard for taking the time to respond to my question.

My main concern is about the efficiency of my current solution and whether there are any alternative methods or best practices that I should consider implementing to achieve the desired result.

Retrieving the list of all NFTs in an unordered collection, like TON DNS Domains, requires parsing all transactions on the collection contract and checking every outgoing message to identify the ones that correspond to NFTs belonging to the collection.

I am looking for ways to optimize this process.