Comment by slowpoke

  To write fast code it requires a programmer and if you have 
  a programmer why not just do it in C++ where it will be 
  several times faster?

Why should I as a programmer not profit from extremely fast design/implement/test/fix/repeat iterations? I'm not saying scripting/high level languages like Lua, Python or Ruby should always be preferred. But it's equally wrong to assert that C-oid languages are always the superior choice. It's much more a question of knowing when to use what and why, which in my opinion makes an important part of being a good programmer.