extremely slow performance with 2.4.1

Created originally on Bitbucket by tridinger (Tom Ridinger)

I just recently upgraded from 2.4.0 to 2.4.1 on redhat 6.5/python 2.6. Spreadsheets that were taking 20-30 seconds to open now take 8-10 minutes to open.

Spreadsheet is 2MB in size. The following command takes 8-10 minutes to come back. wb = load_workbook(fullpath,read_only=True)

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