Create Cut Fill Volume - Unsuitable Material Takes long time

Greetings 

I am using openroads 2020 Release 2 for a project . I am creating Cut fill volumes from Civil Analysis. I have only 5-6 short corridors (100-200m long) to analyze which is in an attachment file. I have also ensured there is not any unwanted reference files with huge terrain.

I have clipped existing terrain to the extents of the corridor and removed the rules. The unsuitable material is the top 150mm of existing ground. I had applied a surface template on the clipped existing terrain for unsuitable material.

When i create cut fill volume the process is quick if I don't toggle on calculate unsuitable material. But it runs forever if I toggle it on.

Any suggestion or insight will be helpful. Thanks.

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