Join snap performance poor

[ddangler]

I have a join snap configured as below(Simple left outer join on Unsorted inputs):

But this join snap is performing very poor. Its throughput is around 0.3 Doc/s. Please refer to the below screenshots:

How can I improve Join snap performance? Thanks!

[brianrandolph · Accepted solution]

using a sorted join will stream the data according to the documentation, so it would be better to sort before hand.