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It seems that breakpoints are disposed and created agains during each step. It may be quite expensive. It would be better just to disable and disable the breakpoints.
Target milestone was changed from '3.4' to TBD.
Marian you suspection is invalid. No breakpoint is recreated. I see only extra 4 stopMethod breakpoints created at debugger start.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.