I have spent a decent portion of the last few months identifying and fixing bottlenecks in Rhino performance. As a result, in many cases Rhino BETA runs significantly faster than Rhino 8 for many tasks. These include, but are not restricted to: Opening large files. Display performance for fi…

At this point I would like to request users to report areas of Rhino that they consider to be slow - especially if it is something that we will be able to repeat here, either with a model or with clear steps.

[image] Andrew le Bihan: Display performance for files with large numbers of objects. This one: [image] Displaying selected elements takes too long Serengeti (Rhino WIP) The following applies to Rhino WIP using Direct3D. It’s more or less the same with…

I usually have a lot of problems importing big step files, since they have to build all the geometry and everything, but I am not sure that might be solvable.

Save A Copy is typically very slow. SaveACopy extremely slow - Rhino / Rhino for Windows - McNeel Forum

Perhaps some improvement aspects to be considered: _TestEnableMultiThreadedMeshingshould be finalised and integrated into Rhino 9. It has been in limbo for three versions(?) Internal referencing for large items. Blocks and individual meshes should be able to support a point cloud appearence, or ev…

I will review https://mcneel.myjetbrains.com/youtrack/issue/RH-90869 - it has been re-prioritized for 9.0

Try this in recent builds - I recently turned off compression for render meshes by default. This was by far the biggest bottleneck (you can still compress as an option on the save dialog)

Thanks @andy , I just updated WIP and tried Save A Copy vs SaveAs. Save A Copy still takes much longer than SaveAs. Considering Save A Copy opens the SaveAs dialogue, I don’t know why there would be any difference between the two commands. Conceptually the only difference is the automated name is …

Using transparent images. For drawing over raster Images, I usually assign the raster image as a material, and then adjust its transparency. Once I start moving the slider, the feedback is very slow. Thanx!

Rhino BETA Feature: General Optimization

Serengeti (Rhino BETA)

Czaja (Jakub Czajczynski) January 14, 2026, 10:43pm 3

That is very good to know. Thanks for all the improvements. I just tested yesterday’s WIP, and this problem still stands. Right now, modyfing one value in the attribute user text for 400 objects took over 20 seconds. All the details are inside this thread. If it’s more of a GUI problem, and it’s known, then please delete this post.

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Rhino BETA Feature: General Optimization

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