I was curious, so I ran some tests in my desktop dev vm w/ a stock Postgres 9.1 install. I ran batches of ingests of 100 records, repeated 10 times, the first batch without display field extraction and the second with:
Total Time: 74540.091 ms — no display fields
Total Time: 77274.786 ms — with display fields
If my math is right, that's a 3.7% increase in overall time. Or, roughly an additional minute for every 30 minutes of ingest time.
I was curious, so I ran some tests in my desktop dev vm w/ a stock Postgres 9.1 install. I ran batches of ingests of 100 records, repeated 10 times, the first batch without display field extraction and the second with:
Total Time: 74540.091 ms — no display fields
Total Time: 77274.786 ms — with display fields
If my math is right, that's a 3.7% increase in overall time. Or, roughly an additional minute for every 30 minutes of ingest time.