Do not issue updates that change advance settings. Last update turned AutoComplete back on and slowed down my large spreadsheets.
Please do not issue updates that change non-security advanced settings. The last update apparently turned AutoComplete back ON, which renders very large spreadsheets with columns containing large amounts of text almost useless. (i.e. when entering a value in the column and moving to the next cell, Excel locks up for almost a minute trying to find something to AutoComplete with from a huge dataset before allowing the user to begin typing in the new cell). Not realizing an update would change this, a large spreadsheet quit functioning when presented during a web conference.