The OrcaSlicer release index describes version 2.4.2 as a maintenance update with fixes for profiles, cloud sync, connectivity and crashes. Its 2.4 series also supports sending packaged 3MF jobs and includes changes to skirt and brim handling.
That makes this a good time for a controlled slicer comparison on a troublesome model. Keep geometry, nozzle, filament and layer height identical. Compare estimates for wall time, travel, acceleration limits and material consumption rather than treating a shorter number as guaranteed.
OrcaSlicer publishes a universal Mac build. Check the current release notes and the printer profile before connecting it to an H2D Pro; vendor-specific functionality may not match Bambu Studio exactly.
For the kitchen bin or another large functional print, the most useful output is a small table of slice time and wall/infill breakdown. Do not hand-edit printer-critical start G-code just to chase a speed estimate.
What to do: Download or review the official Mac OrcaSlicer release and compare one H2D print estimate against Bambu Studio without changing model dimensions.