files imported from archicad 15 in autocad 2010 which result heavy

[Giovannino60]

Hi, I efefttuated from a 3d design by archicad 15 various files exporting them to autocad 2010, I took all these rows of views sections or prospectives and I joined them in a single file. I exploded every design. the total file is about 600 kb, but it is very slow the file I have already cleaned by doing eliminates the blocks and I checked in fast selection if there are covering objects but I do not report them. What can I do to speed up these files?
Thank you.

 

[PlannerRoad]

did you repeat the command several times?

 

[lattu]

select everything and copy to new file