locate high priority VI?

I am developing a vision system on a CVS-1457RT, and I am having some issues with CPU load.

It seems like about 17% of the CPU is always comsumed by a VI that has "high priority" - and this is also when my system is more or less idle (polling some IOs etc)

I have gone thru all my VI's to see their setting, but can't find the one with high priority.

I have tried the profiler, but no sub vi's are consuming much CPU time in this idle state.

Any idea on how to loctate whatever is using 17% of my CPU?

best regards,

Henrik