Slow BIM Model - Are over 3 million polygons to much?

[fuzzytnth3]

We have a slow BIM Model - Which has over 3 million polygons in it having run the Polygon count tool on it.

Is this excessive or is it that other consultants files most of them are Autocad DWGs but also PDFs which have been inserted for references maybe the problem instead?

[Laszlo Nagy]

I think both can be a problem.
It is relatively easy to test: save your project under a new name and in that new file delete all DWGs and see if the speed improves. If it does then the DWGs are the reason.
Or delete all the PDFs and see if the speed improves. If it does then the DWGs are the reason.
If you delete all DWGs and PDFs (placed bitmap image files may also be a source of slowness) and the file is still slow, then probably the size of the model is the cause.