It really depends on what you're building whether that perf cost is problematic or not, and usually it isn't. If 90% of your code is clean Rust and the last 10%

It really depends on what you're building whether that perf cost is problematic or not, and usually it isn't. If 90% of your code is clean Rust and the last 10% outside of the critical path is a straightforward clone or Arc, then I see no reason not to go that way.