I don't think that's true - the Ruby VM switches threads when blocked on IO like http or db. This happens regardless of what Rails is doing. Maybe you're talki

I don't think that's true - the Ruby VM switches threads when blocked on IO like http or db. This happens regardless of what Rails is doing. Maybe you're talking about suboptimal usage of cores...afaik it's indeed being worked on in the Ruby community and it's not something Rails can solve.