Clemens,
Apologies for the delay in getting back to you, work suddenly got extremely busy and I haven't had a chance to follow this up. I can't find a PM with your details on, if you can send one with an email address I'll send you the Revit model.
For the benefit of the thread the hardware specs are:
HP ZBook Studio G3
Windows 10
Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz, 2808 Mhz, 4 Core(s), 8 Logical Processor(s)
32GB ram
SSD
Quadro M1000M with 4GB dedicated video memory, access to 20GB total memory, Driver version 373.06
I've set the BIOS to disable the embedded Intel gfx to force Revit to use the Quadro
The laptop is connected to a HP USB-C Dock, which in turn has 2 external monitors attached, so in total the Quado is running 3 screens, 1 @ 1920x1080, 2 @ 1920x1200
The Revit dataset isn't particularly big - the combined A/S/MEP models come to 420MB.