High CPU load when sampling from two PCI 4472

Hi,
LabVIEW 8.6, DAQmx 8.7.2 PC: Pentium 4 3.2 GHz, 2 GB Ram, Windows XP Prof Service Pack 2
I have an application with two PCI-4472 cards connected together with a RTSICable and I am sampling at 44.1 kHz.
When I only sample from one of the cards the CPU load is about 2-3 % regardles of whitch off the cards I am sampling from.
But when I sample from both cards ths CPU load goes up to 50-60 %.
I have made an clean VI with only an DAQ Assistant and this gives the same result: 3% + 3% = 60% ... ???
What can I do to get the CPU load down when using two PCI-4472 cards ?
Kind regards
Leif Christensen

This is happening to me too, but i found a solution. try to change the way you look at music , on the left of search is 4 buttons, List view , Album List view, Grid view , Cover Flow view. try to change the view, then view your cpu usage, it worked for me, but not for my friend, so im not sure that it will work

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High CPU load when sampling from two PCI 4472

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