Severe Lag in Rhino 8 After Updating to macOS Tahoe

Rhino Rhino for Mac
1

Hi, I’m experiencing severe performance issues in Rhino 8 right after updating my Mac to macOS Tahoe (26.1).

I’m using a max-spec Apple M1 Max, and Rhino has always run smoothly before this update. However, after updating:

  • Rhino 8 immediately jumps to 100.2% CPU usage even with a completely new, empty file.

  • Simply orbiting around a box causes heavy lag.

  • Typing any command results in a 3–15 second delay before it appears.

  • Display responsiveness is extremely slow in all viewports.

  • The lag happens even if I start Rhino with no plug-ins, no special settings, and in a fresh file.

2

I had a maybe a similar problem. While working I saw a lot of beachballs with my M4 max. While working. Every few minutes I got a beachball for round about 20-30 seconds.
I saw similar appearance in other apps (not as heavy as in rhino - maybe 2-5 seconds beach ball). I did a bit digging in some mac forums then and find a solution for my problem.
There was a Problem with the indexing of my Spotlight search. You can fix it with force the spotlight search to do a new indexing. For this you have to deactivate spotlight for your SSD for a few seconds and then reactivate it back.
For me was this the fix for the beachball appearance in Rhino. → Maybe give it a try