[GNC] Help breaking up a file

[Eric Jensen]

I have been using gnucash to track my personal finances since 2011. I have just
continued using the same file over the years. At this point it is over 45MB and
it is noticeably slow when opening it. I realize now that I should probably use
a new file for each year. Is there any way for me to break up my current file
into yearly chunks? I tried exporting all transactions for a year in CSV format
and then importing them into a new file that I had created exporting the
accounts, but that seemed to have a lot of errors. Does anyone have a simple way
to accomplish this?
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Thanks,
Eric