Kaspersky or ESET antivirus: Memory usage

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Hi friends. I'm using ESET Nod32 smart security on my desktop since a long time ago. I believe that it is a top antivirus together with Kaspersky, Symantec, Avira,... One of the most emphasized advantages of this product is the low memory usage. I have Kaspersky Internet Security on my laptop which I bought one year ago. When I compared their memory usage (task manager, processes for all users) I found that kaspersky is using normally less than 10Mb and when I'm busy with several softwares and internet, it reaches 30-40Mb. On the other hand ESET Smart Security is normally using 40-50 Mb. I have vista on my laptop and XP on my desktop. Of course, they have diferent CPU, RAM, ... and even programs installed. But in general I'm thinking if Kaspersky is better from the memory usage point of view. What do you think about this special matter? If you are using another AV as your favorite, what is their usage? Note that you should check the processes from all the users. Note that some AVs have more than one process for the protection purposes, e.g. EKRN and EGUI for nod32 and two AVP for kaspersky.