If you have a long order history and a somewhat decent amount of customers, this update will cause issues, because in order to show those fancy statistics, it will create thousands upon thousands of "pending actions" which take up a lot of processing power and write operations and may at some point be blocked or throttled by your webhoster. The people at woocommerce must have no idea about running a webshop, otherwise they would not force this "piece of s...oftware" down people's throat. I really don't like the way wordpress is going these days.