When is C better a better choice than Rust?

Hello all, I’m putting this question in this thread purposely because I really want to hear from experienced Rust programmers (whether they be professional or unpaid proficient users of Rust) when they think C is actually a better language choice for a given project.

Based on your experience with Rust, what project types would you still elect to write in C?

Talking purely about performance, not development or compile time.

Also, I understand they would be lower level projects, but I am more curious about actual specific things you would build in C over Rust.