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Ubuntu 25.10's Rust Coreutils Transition Has Uncovered Performance Shortcomings
Ubuntu 25.10's transition to using Rust Coreutils in place of GNU Coreutils has uncovered a few performance issues so far with the Rust version being slower than the C-based GNU Coreutils
Fortunately there still are a few weeks to go until Ubuntu 25.10 releases as stable and upstream developers are working to address these performance gaps. A bug report opened last week is cksum being up to 17x slower than GNU for some large files. We'll see what more performance issues with Rust Coreutils are discovered and addressed prior to the Ubuntu 25.10 release in October.
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