Never had problems with Solidworks until now, and now whenever I try to make assemblies it's extremely laggy. Like 5 fps laggy. I just updated my computer and tried to see if I could downgrade my graphics card drivers but I can't. I'm using Solidworks on Dell Xps 13, 16 gb Ram, 512 SSD, Intel Iris 540
Bradley,
Not sure if you found a sloution yet but I rolled back the driver updat and that seemed to have worked.
1) Open "Device Manager"
2) Select Display Adapters
3) double click on the video card name
4) select the Driver Tab
5) Select (roll back driver)