To make sure that you are using latest priPrinter software available, priPrinter automatically checks for new version. This is the default behavior and you may switch it off in priPrinter preferences dialog.
During Update process, priPrinter downloads small XML file with information about latest version available. Usually it happens once in a 5-10 days, and only when priPrinter application is running. There is no any background process. Performance of your computer is absolutely not affected.
Update process sends only priPrinter build number and X64/32 flag. Our server receives only the following string:
Agent: priPrinter ia64 updater  or Agent: priPrinter ia32 updater 
There are no any private and user specific information. Only priPrinter version.