Ubuntu 25.10's Rust Coreutils Transition Has Uncovered Performance Shortcomings

These bug reports are most appreciated; we fully expected to run into corner case issues like this.

The team working on Rust coreutils have been loving the feedback wider testing provides, and I am sure that 25.10's wide usage will enable Ubuntu 26.04 LTS to be confident in the new stack. It will also enable other distros to consider making the same change.