AutoCAD Map 3D - Performance issues

[erikgruener783628]

Hello Community,
since a few days the attached file has performance issues. The open process takes nearly 2 minutes within a main memory workload of 60%. After that we can work continiously in the model area. But if we want to change to the layouts (15 pcs.) and switch between them, the main memory workload increase up to 97% and AutoCAD crashes. The proof and purge commands bring no improvement and find no bugs. The TIF shortcut is deleted and frequently occurring assemblies are organised in blocks. Non of these improvements bring any changes. We work with AutoCad 2019 Map 3D.
CPU Workload: 15% (continiously)
Graphic card Workload: 0-1% (continiously) – is that normal?

Computer We work with Lenovo Thinstations P520C (16 GB main Memory, 4.00GHz CPU, 4 processor cores and a NVIDIA Quadro P2000 graphic Card). We have the problem on all our computers.

Performance try outs
We try to deaktivate Hyper Threading (Lenovo Performance Manager), on processor core is only for AutoCAD reserved and we dont run Auto CAD in compatibilty mode with older windows versions.

Our normal Workflow
Other dwg files with the same scale run at a main memory workload of 30%. If we switch between the layouts the workload increases up to 50% but not much. But Auto Cad runs not 100% smooth.

If you have any other ideas for performance or handling improfements of this scale of dwg files please let us know. (maybe work with xref or sheetsetmanager)
Attached file (Wetransfer Link)
https://we.tl/t-B647tiEjF2
Please only copy the https part.

We hope you can help us.

Kind regards

EG