Thanks for replies.
I’ve not checked the Rhino reported memory usage but will do so next time it slows. I’ve just checked the files I was using and its about 1 GB on loading, and rises to about 1.5 GB, and the system has 32 GB available.
I have AVG anti virus but I’ve never found it to be at all instrusive - that’s one of the reasons I have it.
I will try AllCpuMeter, thanks for that.
I have just done a few tests using GPU-Z that seem to show Rhino or a plugin holding onto GPU RAM, to the point where it becomes full. Could that be the cause of the problem, and if so, is there a command I can use to get Rhino to flush / release that memory and effectively start from fresh without restarting Rhino?
This is what I found from GPU-Z:
*when the performance had become so slow I had to stop (but before I closed down Rhino), my graphics card was working at about 2% when I tried to do a 3D orbit, but the GPU RAM was full (3980 MB of the available 4GB)
*when I closed Rhino, the GPU RAM load dropped to 200 MB
*when I reopened the same drawing and pointcloud data after a Rhino restart, the GPU RAM rose to 210 MB. After quite a lot 3D orbits and zooming in and out of the data, where the GPU was working at up to 50%, the GPU RAM load had risen to 400 MB - I think that what is happening is that the GPU RAM just keeps getting added to, rather than flushed / replaced (I don’t know how memory works - is that possible?)
*I tried a different but much larger, more complex, drawing, without any pointclouds. After loading, the GPU RAM was at 350 MB (I was looking in a shaded viewport). Some 3D orbits got the GPU running at up to 16%. Then I changed the display mode to rendered, and the GPU RAM went up to 700 MB (there are textures and materials in there, and a lot of lights). I then changed the display mode back to Shaded, and to Wireframe, but the GPU RAM load only dropped slightly if at all (about 2 MB. Then I just swapped between various display modes I thought would need RAM (Artistic, Pen, XRay, etc), and the GPU RAM just kept getting added to - it wasn’t long before I got to 900 MB - so over a couple of hours I can see how it would get filled up.
I’ve got GPU-Z logging now, so let me know if that data would be helpful and I can send it over.