Most people might think that any old network card will do! and they would be wrong, particularly if your talking about a Network Interface Card (NIC) that is integrated into your motherboard. This will be a problem for your MediaPortal PC if you plan to copy files to it while MediaPortal is running and/or recording live TV, and you only have a low specification PC.
An integrated network card is one that cannot be removed from your PC.
No, an integrated NIC does not have its own processor to handle the data that is sent and received over the network.
Because the processing must be done by the main CPU in the PC, which adds extra load to the system.
If you copy a large amount of data to your MediaPortal PC while it is running, and the video or sound begin to stutter or jerk, then your system is being affected by this problem
Install and configure network card in a PCI or PCI-x slot and disable your integrated card
This will be a problem with hard wired and wireless network cards. You could try excluding the directory you are copying the files to from on access file scans from your anti-virus scanning software.