software recommendation – Is there an alternative client for Homebrew?

As far as I know, there exist no other implementations of HomeBrew than the standard one.

I doubt that the main cause of any wait times is due to the fact that it is programmed in Ruby. Such a program does not “magically” become faster just by being implemented in C. It is of course fully possible for other implementations to be faster, however one could also fear that for example an implementation in C would be more prone to security bugs.