BIG FILES slow result

I have made some joines with oracle tables but my end result is this:

The joins I made result in a big data files and they take a lot of time to load. Is there a way to speed up things?
This is my workflow:

@cinthy , DB Reader is streamable node. So, you can try to write all joins in sql text of DB Reader and stream the node. Also, it is not clear what do you try to do in the loop. Loops are pretty slow and possibly you can skip the one.


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