The implementation of multi label segmentations seems to be rather slow. Profiling mitk Workbench in release mode brought up an time consumption by the 2D mapper of ~0.1 sec and the profiler indicates that a substantial amount of time is spend in the mapper.
Having e.g. a workbench with the StdMultiWidget editor and two segmentations lead to an update duration of ~0.4 sec per position change. So we get only ~2 frames per second when moving the current position arround.
This is quite laggy.

If one removes the multi lable segmentations we are achive a much higher frame rate. Normal segmentations do not have such an problematic impact.