Seeing some weird latency as well on mouse movement occasionally. iMac Pro 12 core.

This is a strange one as XCTest is nowhere to be found anywhere in the build settings or schema, and a fresh project installs fine, even with similar dependencies. Plus, from Xcode 26 it will build and install fine on an iOS 18 device and the simulator. So its something with this Xcode project and iOS 26 phones.