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Investigate your setup, find bottlenecks(network? disks? cpu? memory?), scale them up. Repeat until satisfactory results are achieved

Wanted to know, any other way of loading data to druid?

Did you have hadoop cluster?

Its emr

I dont have experience with emr, but you sould look into docs: https://druid.apache.org/docs/latest/ingestion/hadoop/#loading-from-s3-with-emr