3d plant 2013,dead slow opening MEP DWG file

[matiasm74]

Hi!

I try to open and use a file 6,2MB saved from MEP revit (I think) to a DWG file.

I can open the file but it goes dead slow.....

rotate the file and so on is also very,very slow.

I have tried it on three high performance machines, same result...

Xeon  3GHz, quadro 5000 2,5GB, SSD, 12GB RAM

and one machine with an i7 and 16GB RAM, SSD, and a gaming grafic card 560 GTX.

Is there some known bug ?

Any tips/trix ?

Br

Matias