Very large GL batches - posting performance

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Does anyone know any smart ways to potentially improve GL batch posting performance?  We are looking at typical batches of 1500 to 2000 entries with 8 details per entry.  They take 7 minutes to post on a fairly high end server.

I'm wondering if there are is any tuning anyone knows about that helps specifically with Sage 300 posting.  Also if anyone has experienced whether more smaller batches post quicker overall, or fewer but bigger batches.

They are looking at 20 days to post December batches so any percentage reduction would make a big difference.

Thanks all.