Hi, I have a Model with >140.000 Entitys and saving as DWG is nearly impossible (takes many minutes): var writer = new DwgWriter(mstream, model) { AutoCloseStream = true }; writer.Write(); Can you fix? Thanks, Michael

Oh wow, that's huge. If you can send me the drawing somehow I will try profiling this. I don't expect I can make it significantly faster though. - Wout

sent :)

I indeed found an inefficiency in the block/insert DWG writing for this drawing. I've rewritten that part and now CadLib writes the drawing in about 8 seconds on my machine. Please download the latest CadLib 4.0 version. Thank you for the report! - Wout

Thanks Wout, now it works fine :) (even with >500t entites ~25sec in debug ;) )

Saves a lot of CO2! - Wout