I'm using Mac Snow Lepard. While this is an older OS it is adiquate for my needs.
I think there are two parts to the issue here:-
1/ I have noticed that when I use the finder to copy several giga bytes from one hard drive to another the system alternates between intensive disk activity with little or no Intercheck activity on the CPU, and, little or no disk activity with intensive Intercheck activity on the CPU.
The interpretation to make here is that Sophos hasn't quite got the piplining process down pat so that these activities are occuring more concurrently and reducing the demands on the system memory.
2/ The other thing that I've noticed is that Sophos is obsessive about scanning everything that reads and writes the HDD (as it should be).
That is, when Spotlight decides to re-index the HDD, when Safari decides to cache and/or data, when itunes up/down loads data to the HDD, each time you start an application, and, open or save a file, all these things contribute to making Intercheck very busy. I mean, very, very busy.
So, while we're waiting for Sophos to get a handle on this, some of things that we could do are:-
1/ Increase the the RAM size of your Mac computer,
2/ Be consciensous of how your running applications are using RAM so as to avoid excessive swapping of RAM memory to disk, and,
3/ be aware that some activities may place high demands on Sophos.
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