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One way to slim down your database is:

File menu > Move Old Data to Archive...

This should help slim down the database by moving any old completed tasks to the Archival database.

You can always look at your archival database by selecting

FIle > Open Archive

I've found that when I'm on the go, I don't really refer to anything older than approximately 30 days. I'll always have 30 days of past completed tasks but no more than that. If I really need it, I'll tell a client that I'll look up my history when I get back to the office.