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Same problems here!
McSvHost and / or mcsheild, McSACore all hog massive ammounts of CPU - seems to be whenever my email client accesses my mail accounts and whenever I open a new IE window.
PC grinds to a halt - like being back on dial-up!!
Can anybody help!
Do what I do: go into Task Manager and sort by CPU. Highlight mcsvhost.exe and kill it off. It will come back but won't hog as much CPU as before and your computer will behave better. I really wish McAfee would fix this issue so we didn't have to do this, but so far they seem to be silent. But they'll be glad to reinstall the same crap over and over for you ...
Do you have nero scout installed?
I eventually gave up with McAfee & got Kaspersky FREE with my bank account.
BYE BYE McAfee - another client lost.