Detailed profiling asp.net uses only one core

Hi,

trying to find a bug in an asp.net application, using Performance profiler 8.6.

When profiling with method-level (all methods inc. framework) (or line-level) CPU usage goes to 100% but only on one core. The application does not respond (never seems to come up) although it's clearly doing something.
If I detach the profiler, the site responds immediately.

Am I demanding too much of one core? Can I profile using all the cores?
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