think it's fair to say performance rust is hard to write
This situation proved exactly the opposite.
They wrote a utility to pass functional tests. It did. Then people said it was too slow. So, in just a few days or hours, they dramatically sped it up while still passing the tests.
Seems like it was pretty easy to write fast Rust code in this case.
GCC is adding cool new languages too!
They just recently added COBOL and Modula-2. Algol 68 is coming in GCC 16.