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There is no cache for a current call stack. So whenever the debugger needs call stack, it asks the remote JVM. It is expensive, especially if a connection between debugger and the remote JVM is slow.
Target milestone was changed from '3.4' to TBD.
I assume that it may hurt stepping. Dependency added.
Marian discovered that JDI implementation caches callstacks. AFAIK debugger uses JDI API for all debugger operations. Reopen if you thought something else.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.