That sounds like a scaling problem, but munching a sequence of independent records is generally linear in the size. From your description of the problem I think you are expecting that. Two possibilities come to mind: memory usage and database internals.

Are you slurping the file or holding all the records in some global data structure? Driving the machine into swap gives a big performance hit. The solution is to keep records in a small structure which goes out of scope as soon as possible.

Without knowing more details, it's hard to guess what db server operations might be a bottleneck. As a database grows, insertion becomes slower, but your numbers don't seem large enough to make that the issue. It's possible that a store of pending transactions is getting uncomfortably large. If so, try commiting your insertions more often.

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