Even so 16.666 ms is a lot of time for just handling mouse input.

The CPU has other things to do too.

No matter what you do the CPU will always have other stuff to do.

So you agree...

Attitudes like these is how we eventually end up with bloated messes like Electron. Performance matters, everywhere. Some of us increasingly also use monitors with more than 60 hertz.

Yes. 640 usec should be enough for every mouse.

It's also very easy to write alloc C++ code, no?

This is pretty silly. They have the option to alloc and leak in C too. Rust is also just guaranteed memory safety not leak free, right? In a competition of lazy code, I'd rather GC pauses than OOM crashes.

But C# isn't ideal for a driver because of the weight of the runtime not because it's hard to save on allocations.

It is correct that Rust does not (nor claim to) solve memory leaks.