If QuickBooks is not running at the speed you want it then there are some things you can try to speed it up, I have compiled a list of items from articles on the web that you can try to improve performance, no two QuickBooks setups are the same, so whilst some of these may have no apparent improvement others will. The secret to it is tweaking until you get what you need. As always back up your company file before attempting any of these.
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