One of the main considerations for the offsite mode is enabling users without admin rights to be able to access the encrypted container without having to ever install any software/drivers on the target device. This is because it is not always guaranteed that you will have Admin privileges on all machines that you are try to access the encrypted device. So, all required encryption software is carried with the container; mounting is achieved as a virtual path, and is exposed through our explorer. Hence, data transfers might be slower compared to a copy operation to an unencrypted device.
Item 2: Do you have a lot of files on your device when you try the offsite mode? Is the impact considerable as compared to an encrypted device?
Items 3 & 4: Best to contact McAfee Support, haven't come across these
Thanks for your reply. I don't have lot of files on encrypted device. I guess that problem is in FRP module, which work very slowly, unstable, unexpectedly and overall very not satisfying. When I contacted with Support McAfee claims that I have installed client on not supported Polish version of Windows 7 SP1. Very funny Now I must install English OS and try prove them that are mistaken.