You may adjust the default STEP Export settings for both ACE & FAB 3000 to drastically reduce conversion time and file sizes.
1 Increase "Arc Resolution" from 12 to a higher value such as: 18, 20, 24 or 30. Determine the highest value that is acceptable to you.
2 Increase the "Minimum Line Segment" value. This will remove any adjacent vertices within the value you assigned. This will drastically reduce the files sizes. Determine the highest value that is acceptable to you.
Is it possible to generate STEP output with drilled holes in metal?
Yes, please view the following link: