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It does for a novice. But once you learn Rust, it's actually quite productive. Rust has proper collections, strings, iterators, automatic (but not GC) memory management, error propagation, etc. This eliminates a lot of busywork, and makes Rust "denser", so you write less code, but get more done.
No, the greenfield coding phase of Rust will always take longer than the same code in C: Rust will require you to think things through, while C by default accepts any morass of half-defined code. The eventual rust code+debug+maintain speed will be higher than the equivalent C speed, for the same reason. This means that rust is slower for vanity projects that won't be used in practice, or for low quality products with…
I have many years of experience in both, and I can confidently say that for experienced programmers Rust is both quicker than C to get something useful working, and to get projects polished and production-ready.
Rust has a useful standard library (compared to C). You have hashmaps, btrees, or vectors with lots of helper methods all available in less than it takes to hand-roll a linked list.
Rust has lots of high-level crates that you can leverage. You need to fetch some JSON? It's a few lines of code to get it into a native struct, type-checked for you. You can have it running in less than it takes to craft a Makefile.
Rust is also productive for robust code. You don't fiddle with malloc, so the whole `goto cleanup` code is gone, and you don't spend any time chasing memory corruption, leaks, or unexpected NULLs. And these are often static guarantees, not something to fuzz out of a stanitizer.
If you need code to be multi-threaded, it can be as easy and high-level as OpenMP, but you get a compile-time guarantee of no data races, even in 3rd party code you use. Some errors pointed out by the Rust compiler have saved me what could have been weeks of heisenbug debugging.
It's normal that you move slower when writing an unfamiliar language, and Rust certainly has a steep learning curve. But once you learn it, Rust feels closer to high-level scripting languages than C.