As @Christian_Dahlqvist points out, the concrete performance and resource needs you'll have to experiment out yourself, we can't guess/estimate them easily from afar, there's just too many variables playing into this.
Yes, as posted above you will save significantly on memory e.g. the following
will not be loaded on heap constantly or frozen indices. This will however also significantly reduce query performance but as I said may be a valid tradeoff in your use case.