I don't think it has much to do with languadge, it is true some languages run slower than others, but these days almost all the languages have a variant that ru

I don't think it has much to do with languadge, it is true some languages run slower than others, but these days almost all the languages have a variant that run in one of the VM's which most would agree are scalable. To me scalability is all about architecture, and the #1 item that you can do to architect a scalable system is statelessness.