A post was merged into an existing topic: Material Tab and thumbnail preview being extremely slow
We have been working on this issue for a while now, and one thing that seems to be common - and very important - is this: Google Drive has terrible performance.
If your 3dm file is on Google Drive, or your textures reference files on Google Drive (the G: drive), then Rhino performance will ground to a virtual halt. This is because simple system calls to determine if a file exists at a specific path take ages when that path is on the G: drive. And this happens a lot from Rhino.
The same is true, BTW, of linked blocks.
Having said that, there are certainly performance issues compared with V7 that we need to deal with, and we will be making some changes over the next couple of service releases to improve that.
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RH-85019 is fixed in Rhino 8 Service Release 16
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