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Could be a v19 Mac Problem in general (Structure Tree ?)
but any File above 30 MB seems to lag for me after some time of working.
Meanwhile any of my IFC import tests, even smaller ones are lagging.
I remember that there was anywhere a discussion about specific
OpenGL Settings that may work better. And that I did changes in v18
But as hard as I tried to search, I don't find it anymore.
AFAIK it was about GL-Swapmode or such things.
I have still more than enough of 24 GB RAM on my "old" nMac Pro 6 core.
2*D700 with 6 GB VRAM. macOS Mojave 10.14.4.
I use BIM or Model View Mode (Shaded, no transparency) no Antialiasing.
I have all multi-threading on nut also tried without.
Sub 1000 BIM Objects, all Solids.
Does anyone know best Hardware Settings in Settings for RedSystem on Mac ?