Hatch slow when selecting internal points - geometry created with FLATSHOT

[RockyBrown4134]

I have a colleague that created a drawing thathe wants sections hatched to indicate visually. The geometry was created using FLATSHOT on a 3D model  , then blocked, and placed in a new drawing file. In the attached drawing, the hatched sections took an average of 8 minutes each. He ran OVERKILL to clean up the geometry and still the same problem, maybe a fraction faster. We also ran an AUDIT and  there were no errors.

Has anybody run across this before? Any suggestions?

AutoCAD 2012  (AutoCAD Mechanical) SP2

Autodesk Product Design Suite Premium 2012

[nestly2]

I love FLATSHOT command, but the resultant blocks are often very data heavy, and can cause drawing file size to increase expotentially (even after using OVERKILL) 

If the Block in attached drawing is exploded, HATCH > Internal point works pretty speedily, so I'd guess it has something to do with the the way HATCH analyzes blocks.  (there are ~15,000) objects in the block)

[RockyBrown4134]

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@nestly2 wrote:

 (there are ~15,000) objects in the block)

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That was AFTER Overkill was run.

I agree, FLATSHOT objects are Data Heavy.