[texel]

ActiveRecord was never rewritten in C. Twitter's problems stemmed from the fact that they had written a realtime messaging system, but designed it like a microblogging platform. The design wouldn't have scaled well, regardless of the technology they used.

[jarin]

Oh you're right, I was thinking of the MySQL bindings (don't know where the original ones are at)

https://github.com/brianmario/mysql2/tree/master/ext/mysql2