My company uses Zig to write software for small Linux devices, such as set-top boxes.

The biggest benefit isn't exactly performance, but the absurdly tiny binaries it produces (very convenient if you are working with small flash disks!), and how the Zig standard library doesn't depend on anything other than the kernel, which means you can often entirely ignore all library issues; more often than not our software 'just works' when built for some new customer platform even though I've never even targeted that environment (or even CPU architecture) before.