If possible, edit the CAD file so that it does not include geometry features that needlessly extend the bounding box, in particular:
Pipe work and risers.
Small boxes, buildings or construction lines far away from the main geometry where the fire zone is located.
Roads, or other features.
Note that this is normally not a problem for offshore projects, except when risers or flares are included as part of the geometry
Even then, this guidance is more relevant to onshore projects as shown in the Distribution Comparison section.
It is good practice to crop geometry before performing your fire and gas mapping analyses.
Cropping geometries not only puts less stress on the graphics and memory cards but allows for faster computation times.
It is good practice to crop your geometry to have a single fire zone per project (.d3d file).
When you have finished viewing the results close the project.