-= In my experience, it was lighter on memory compared to avast.. But, bites-back on CPU.. Moreover, it couldn't completely disinfect my Flash Disk, I had to manually remove RECYCLER.exe & New Folder.exe..
Memory really is a poor indication of the AV being light, RAM is cheap and plentiful on most systems. There are no really goo ways of finding exactly how much memory is actually used and the Task Manager has several different memory headings.
It is also easy to actually hide memory use if some of your applications processes are at Kernel level (I don't know if that is what you meant by low level), these aren't reported by the task manager as a part of the application but in the total for the system.
AVG used to do that and many people thought that it wasn't using much memory, but all it was, was you couldn't seem much of the memory it used. Running some functions at Kernel level aside from masking RAM use, can also have adverse issues, as if that kernel based function crashes it takes down the OS as opposed to if it weren't running in the Kernel it would just crash the application.
RAM really is a minor issue these days and the performance CPU issues are more likely interfere with normal computer use.
