The longer I run V9, the slower the middle-mouse menu pops up. If I run a session for a few hours, it will take several seconds to pop up. Closing & re-opening Rhino seems to fix it.
I tried to do some trouble-shooting. If I open Rhino 9 and click the mmb to make the popup toolbar pop up & close 100 times (which is 200 clicks of the middle button), the problem starts happening. At that point, suddenly there is about a half-second or more delay before the toolbar pops up. If I open another window of Rhino, the popup toolbar appears instantly, so I don’t think it’s a mouse issue. Also, I cannot repeat this in Rhino 8 but can do it consistently in Rhino 9.
The number 100 is not perfect - sometimes it starts sooner and I don’t know why.
I haven’t done a longer click test, but in regular work I notice that it eventually slows down much more. But even at half a second, it becomes essentially a huge pita and I have to close & re-open Rhino.
I have the same issue
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Oh, in case it matters:
Logitech MX Master 25
And system info:
Rhino 9 SR0 2025-10-21 (Rhino WIP, 9.0.25294.06305, Git hash:master @ e30e21fc82b0d0316b6de38e64dcbefeed40a88e)
License type: Commercial, build 2025-10-21
License details: Cloud Zoo
Expires on: 2025-12-05
Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 32GB)
.NET 9.0.1
Computer platform: DESKTOP
Standard graphics configuration using DirectX
Primary display: NVIDIA GeForce RTX 3060 (NVidia) Memory: 12GB, Driver date: 8-14-2024 (M-D-Y). DirectX(11)
Accelerated graphics device with 4 adapter port(s)
- Secondary monitor attached to adapter port #0
- Windows Main Display attached to adapter port #1
Secondary graphics devices.
None found.
DirectX Settings
Safe mode: Off
OpenBLAS: OpenBLAS 0.3.29 DYNAMIC_ARCH NO_AFFINITY SkylakeX MAX_THREADS=64.
Rhino plugins that do not ship with Rhino
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 9 WIP\Plug-ins\Commands.rhp “Commands” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 9 WIP\Plug-ins\UpdatesAndStatistics\UpdatesAndStatistics.rhp “UpdatesAndStatistics” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 9 WIP\Plug-ins\MeshCommands.rhp “MeshCommands” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 9.0.25294.6305
C:\Program Files\Rhino 9 WIP\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 9 WIP\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 9 WIP\Plug-ins\SectionTools.rhp “SectionTools”
Do you have issue in 8 also?
No I don’t, only in WIP
I don’t know if it’s the same issue, but tab activation also slows down over time.
Same issue here.. MMB popup delays over time and looks like it’s not about the file. Restarting Rhino WIP (and opening the same file) solves the problem 
Rhino 9 SR0 2025-12-9 (Rhino WIP, 9.0.25343.14055, Git hash:master @ b75d898fa0597c4156f05418133dc1d4fc315abc)
License type: Not For Resale Lab, build 2025-12-09
License details: Cloud Zoo
Expires on: 2026-01-23
Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 64GB)
.NET 9.0.1
Computer platform: LAPTOP - Plugged in [100% battery remaining]
Non-hybrid graphics configuration using OpenGL
Primary display: NVIDIA GeForce RTX 4080 Laptop GPU (NVidia) Memory: 12GB, Driver date: 9-5-2025 (M-D-Y). OpenGL(4.6.0 NVIDIA 581.29)
Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA GeForce RTX 4080 Laptop GPU (NVidia) Memory: 12GB, Driver date: 9-5-2025 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 581.29
Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Secondary graphics devices.
Intel(R) UHD Graphics (Intel) Memory: 128MB, Driver date: 1-18-2024 (M-D-Y).
Integrated graphics device with 4 adapter port(s)
- There are no monitors attached to this device.
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 2x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 9-5-2025
Driver Version: 32.0.15.8129
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 12282 MB
OpenBLAS: OpenBLAS 0.3.29 DYNAMIC_ARCH NO_AFFINITY Haswell MAX_THREADS=64.
Rhino plugins that do not ship with Rhino
C:\Users\gubar\AppData\Roaming\McNeel\Rhinoceros\packages\9.0\Runchat\0.3.6\Runchat.rhp “Runchat.Rhino” 1.0.0.0
C:\Users\gubar\AppData\Roaming\McNeel\Rhinoceros\packages\9.0\SubstanceImporter\2.0.7\Substance.Win.rhp “SubstanceImporter” 2.0.7.0
C:\Users\gubar\AppData\Roaming\McNeel\Rhinoceros\packages\9.0\NVIDIADenoiser\0.4.3\NVIDIADenoiser.Windows.rhp “NVIDIADenoiser.Windows” 0.4.3.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 9 WIP\Plug-ins\Commands.rhp “Commands” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 9 WIP\Plug-ins\UpdatesAndStatistics\UpdatesAndStatistics.rhp “UpdatesAndStatistics” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 9 WIP\Plug-ins\MeshCommands.rhp “MeshCommands” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\RhinoCycles.rhp “RhinoCycles” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 9.0.25343.14055
C:\Program Files\Rhino 9 WIP\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 9 WIP\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 9 WIP\Plug-ins\SectionTools.rhp “SectionTools”
I’ve created a ticket for me to look into this
https://mcneel.myjetbrains.com/youtrack/issue/RH-90985/MMB-Accumulates-slowdown
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