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Lance in KlamathLance in Klamath 

bulk api 2.0 odd behavior

I have 2 custom objects ones a detail record, and the other is a summry record.  I have about 70,000 detail records, and about 12,000 summary records.
Each night I delete all the records from both tables, and re load them using bulk API 2.0.  (auto batch size).

I've been tesing on our Full test sandbox
The 70K records delete in about a minute, and insert in about 3 minutes.
The 12K records delete in about 6 minutes and insert in about 9 minutes.

I know thte batches run in background based on server load, but I've run it ant differtime of day, even on weekends and timing is really consistant.  So why does it take much longer to do the 12K vs the 70K?  and the 70K has a few more colmns than the 12K set.