How do I track down which (sub)VI is using all of my CPU resources?

Hi,
I'm having some trouble debugging a project...
Problem:
Every once in a while, all my Vi's in the project seem to freeze up or execute extremely slow. The machine's CPU load rises to 100% (99% for the LabVIEW.exe process). The normal CPU load with the application running is around 10-15%.
Windows and LabVIEW are still responsive, albeit very sluggish. I can run the "Performance and memory" tool but I can't find any abnormalities.
Question:
Is there a way to find out what's causing the high CPU load? For example by showing the CPU load per VI in memory.
Any input is appreciated.
Kind regards,
Pieter-Jan

Thank you all for the replies. I was out of the office last week and didn't get a chance to reply untill now.
My first thought was also a loop with no timing in it, like billco suggested. The problem is finding which loop is causing the problem, as six seperate loops run continuously and make a wide variety of subVI calls, some static, some dynamic.
@altenbach: The profiler will only show VI's that have started and terminated execution. This means that if I start the profiler when the applicaton has already frozen, I can see very little happening.
I could start the profiler before starting any of the VIs, but the problem usually only occurs after hours or days of running. And when it freezes, I can nolonger shut it down properly.
I have attached two logs of the profiler: One during normal operation and one while the application was 'hanging'.
@crossrulz: I've checked memory usage in the task manager, and it is not excessive.
The project is a bit large to post here (around 300 VIs).
Also, the total CPU load goes up to 100%, but when I tested with a single untimed loop I can only get it to go up to 50% because it's a dual core machine and a single loop can only take over one of the processor cores. This makes me question the theory of the untimed loop...
Any ideas?
Attachments:
ProfileData_Hanging.txt ‏446 KB
ProfileData_Normal.txt ‏443 KB

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