Ruby is compiled, it JIT compiles the code, in theory it should be on par with go once the compiler works out all the code paths, in a long-running application, you should expect the whole codebase to be compiled eventually. More:
It used to be in PHP that every array element took 96 bytes (!!!) of booking overhead. That was/is why PHP is slow. That was reduced and performance basically quadrupled for PHP 7.4.
EDIT: sorry just wanted to add I'm being a bit hyperbolic. These languages are fast enough for their use cases, both PHP and Ruby. But compared to even something like C#, this is where the performance gap comes from, despite both being garbage collected.