I got a similar problem in the latest Rhino 7.
Rhino often constantly uses ~20% of CPU even if I am not doing anything. Besides poor performance, another strange symptom is that hoovering over grasshopper components doesn’t show its details (as it normally does). There is also a noticeable Rhino viewport performance drop and Grasshopper canvas performance drop. Closing Grasshopper doesn’t fix the issue.
It started to happen to me when I was working on the file with different issues
mentioned here: Bug: Material not listed in panel - #16 by Czaja
In the mentioned topic I attached a small part of the problematic file, here I attach full size:
Constant CPU Usage
SYSTEM INFO
Rhino 7 SR9 2021-7-15 (Rhino 7, 7.9.21196.07001, Git hash:master @ a1dd75a58c25c687e78697cfd8dd921026123719)
License type: Educational, build 2021-07-15
License details: Cloud Zoo
Windows 10.0.19042 SR0.0 or greater (Physical RAM: 32Gb)
Computer platform: LAPTOP - Plugged in [93% battery remaining]
Non-hybrid graphics configuration.
Primary display and OpenGL: NVIDIA GeForce GTX 1070 (NVidia) Memory: 8GB, Driver date: 6-21-2021 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 471.11
> Integrated accelerated graphics device with 4 adapter port(s)
- Secondary monitor is laptop’s integrated screen or built-in port
- Windows Main Display attached to adapter port #1
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 6-21-2021
Driver Version: 30.0.14.7111
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB
Rhino plugins that do not ship with Rhino
C:\Program Files\Rhino WIP\Plug-ins\Karamba\License\Karamba3D_LicensePlugin_Rhino7.rhp “Karamba3DLicense”
C:\Program Files\Rhino WIP\Plug-ins\Tibidabo\Tibidabo.rhp “Tibidabo”
C:\Program Files\Rhino WIP\Plug-ins\Tibidabo\VisualARQ.rhp “VisualARQ”
C:\ProgramData\McNeel\Rhinoceros\7.0\Plug-ins\Datasmith Rhino Exporter (d1fdc795-b334-4933-b680-088119cdc6bb)\DatasmithRhino7.rhp “Datasmith Exporter” 4.27.0.0
C:\ProgramData\McNeel\Rhinoceros\7.0\Plug-ins\Twinmotion Direct Link 2020.2 (e24ee14a-9514-47da-8fe6-f6e61b20160e)\Twinmotion Direct Link 2020.rhp “Twinmotion Direct Link 2020” 1.0.6.0
C:\Users\USER\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\IntelDenoiser\0.6.0\IntelDenoiser.Windows.rhp “IntelDenoiser.Windows” 0.1.0.0
C:\Users\USER\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\NVIDIADenoiser\0.4.0\NVIDIADenoiser.Windows.rhp “NVIDIADenoiser.Windows” 0.4.0.0
C:\Users\USER\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\SubstanceImporter\2.0.0\Substance.Win.rhp “SubstanceImporter” 2.0.0.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino WIP\Plug-ins\Commands.rhp “Commands” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino WIP\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.9.21196.7001
C:\Program Files\Rhino WIP\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino WIP\Plug-ins\Displacement.rhp “Displacement”