Rhino 8 WIP viewport much slower than Rhino 7 and often freezes

Well, since blocks were mentioned I of course had to try this…

I recently encountered an extremely problematic file to such a degree which I haven’t seen before… it contains a couple of very detailed PCBs with seemingly several hundreds of block definitions:

Rhino 7 (design with nothing selected): 27fps
Rhino 7 (design with one block selected): 14fps
Rhino 7 (shaded with nothing selected): 38fps
Rhino 7 (shaded with one block selected): 15fps

Rhino 8 (design with nothing selected): 38fps
Rhino 8 (design with one block selected): 15fps
Rhino 8 (shaded with nothing selected): 44fps
Rhino 8 (shaded with one block selected): 38fps

Great, however another test did not fare so well:

Rhino 7 open BlockManager: 1-3 seconds
Rhino 8 open BlockManager: 1-3 minutes

And before you ask, this is a client’s file of their approved medical product containing highly proprietary and sensitive things so there will be probably no chance that I’ll ever be able to share it.

Usually, my design view mode not only looks better than shaded, it’s also often significantly faster. This is sadly apparently no longer the case. Also, the colors of it doesn’t seem to work on the WIP anymore (and I also just noticed that the selection highlight in Rhino 8 is the sickly yellow color, while I’ve changed it years ago in Rhino 6 & 7 to be cyan so now I must locate that setting again).

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