We have a serious lagging issue in the script that contain many clusters. The issue setup: Rhino is set to shaded, rendered or any other view than wireframe A grasshopper file containing many clusters is opened (even with solver locked) The issue: The mere selection of curves in Rhino is extrem…

Thanks I’ll take a look. Its similar to this report that i haven’t been able to repeat. I’ve assigned this to Kike for the moment. [image] Grasshopper on R8 is much slower than R7 Grasshopper Developer Okay so it was not just this script and it wasn’t about th…

I don’t think cluster is the issue, I think the loading of Python & C# into Rhino is. Cluster amplifies it to a significant level. Look at the screen recording below where the first instance of Python and C# components take quite a lot of time while the subsequent ones are almost instant. It wasn’t …

Also an issue, but not related to the original issue in this post at least. Very different behaviour.

@Japhy , @kike - any update on this?

[image] Timo_Harboe_Nielsen: How to replicate: Open the rhino file, set to shaded view, open grasshopper, lock solver, open clusters.gh. select objects in Rhino I still haven’t been able to repeat (8.24.25246.22002,). Have you tried troubleshooting by removing 3rd party plugins?

Hi @Japhy , I checked in SR22 - bug was there. Then I checked in SR23 and the bug was fixed. There is nothing in the release notes that can explain this, but I don’t complain. Worth having a look at why it suddently works maybe :slight_smile:

Have you been able to re-create my problem? We’re all having the same issue in our office & SR23 does not fix it.

@Japhy - we celebrated too early. The error is back. It worked perfectly in SR23, and now the people who have upgraded to SR24 and SR25 have issues. The exact SR24 is SR8.24.25281.15001. This is literally holding the entire company back from using our tools properly, so it’s very high prioritiy f…

[image] Timo Harboe Zollner: Attached files A file containing a series of polylines similar to that of a project file. Clean Polyline File.3dm (4.7 MB) Two gh file, one containing clusters and another similar file with no clusters. Clusters.gh (453.2 KB) NoClusters.gh (749.3 KB) How to rep…

RH-92155 Lag in selecting Rhino Object after GH file with clusters has been opened.

Major lagging in Rhino caused by clusters in disabled Grasshopper script

Rhino

Timo_Harboe_Nielsen (Timo Harboe Zollner) February 24, 2026, 7:05pm 24

You are amazing. THANK YOU!

Annotation bounding box bug

Topic		Replies	Views
Grasshopper on R8 is much slower than R7 Grasshopper Developer windows , rhino8	3	168	August 26, 2025
GH2 Bug : Cluster Editor is very slow Grasshopper2 windows	9	382	September 2, 2026
Script Editor slowing down Grasshopper window dragging? Serengeti (Rhino BETA) windows	5	509	December 20, 2023
Rhino 8 is frustratingly slow Rhino for Windows windows	17	2304	February 3, 2026
Script component causes Rhino to freeze Grasshopper windows , rhino-8	10	602	February 26, 2024

Major lagging in Rhino caused by clusters in disabled Grasshopper script

Related topics