Version in question: 2.70.16 I was copying some data from a reliable thumb drive to my work PC which I had only recently put NOD32 on, and the data transfer slowed to a crawl, at first making me think there was a problem. I checked Event Viewer at that point during the transfer and no errors, then checked Task Manager, and NOD was at 99% CPU use, so obviously it was busy scanning ... fine, and eventually the files shuffled across ... but it was remarkably slow - painfully so. Afterwards I tried the same with another thumb drive I have - same issue. What experience have other users got with this? Try it out if you haven't already - see what results you get. Just for the record - clean PC, no viruses, spyware, faults etc, and Athlon XP 3200 with 2Gb RAM, XP Pro SP2. PC is as fast as always with NOD installed when working straight off the hard drive. Curious.