Project size is around 80 GB. OS: Tahoe 26.2, MacBook: M3 Max. The model provider does not affect the issue. We use XcodeGen, a multi-project setup, and a Tuist‑based caching solution. My coworkers on a similar but smaller project don’t have this problem—however, they don’t use a multi‑project setup. I’ve encountered a similar problem with the “copilotforxcode” extension in its early days. They fixed it somehow.

I can't really share this project :( Maybe there are some other ways I can assist you?