Usage of CustomID on Vertexes


Hi everyone,

I have a confusion about the topic i mentioned below,  could anyone give any suggestion about it? or does the problem familiar with you?  what was your solution?

I need to load data from a relational database to JanusGraph. I want to use CustomID while I am loading vertexes.The main reason behind to use CustomID is that I want perform faster to be able to load related Vertexes on that ID while creating edges between vertexes.

So, document says that if I activated graph.set-vertex-id attribute some of other attributes will be disabled. What are those attributes? Isn't it an approved solution?
Or instead of using ID to reach a vertex is it a good solution to reach it by an indexed property? Which will perform better? 

Thanks a lot,

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