The following applies to Rhino WIP using Direct3D. It’s more or less the same with OpenGL, and it’s the same in Rhino 8. There is a file with ~300000 flat curves. The display performance is excellent when zooming etc.. But not when the curves are selected. Or when we select one curve by a sing…

Hello @Charles Unfortunately, there isn’t really a solution to this problem. As soon as you notice a performance slowdown in the 3D view, you can be certain it’s due to data transfer between system memory and GPU memory via PCIe. For some unknown reason, Rhino constantly updates data on the GPU (es…

Oh yes, and video capture uses a bit of PCIe bandwidth. But I’ve split the video, so at the beginning you can see the bus usage with recording enabled.

[image] jmv: there isn’t really a solution to this problem I think there is a solution, perhaps not yet in Rhino. Other (well-known) apps can handle such cases with ease. [image] jmv: it’s due to data transfer between system memory and GPU memory via PCIe. For some unknown reason, Rhino…

Okay, it’s still strange that the bus isn’t being used at all… And yes, the first version of Rhino really did work very quickly with large imported AutoCAD files.

Hi Charles - [image] Charles: IMO this is NOT fixed. The YT item was reopened → RH-90869 Display: Displaying selected elements takes too long -wim

RH-90869 is fixed in Rhino BETA

[image] Charles: Hmm? I’ve thrown that upon the pile as INF-647 Bozo: Finding Fixes for Disco -wim

[image] Charles: IMO this is NOT fixed. Selecting is still super slow. Dragging selected elements is no fun. I found that the reason for the slow selection is that there are too many very short curves in the scene. When I use SelShortCrv to select and found 353,122 curves shorter than 1mm, …

everytime I import autocad files to rhino, I do _seldup to delete thousands curves and _setpt (I select Z axis) to make all 2d drawings on Z axis, make sure they are not in 3d. That makes my Rhino works so fast. I think most autocad users do not much care if there are duplicated curves, short curv…

Displaying selected elements takes too long

Serengeti (Rhino BETA)

brian (Brian Gillespie) February 4, 2026, 12:46am 13

RH-90869 is fixed in Rhino WIP

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Displaying selected elements takes too long

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