Delay Job on File upload handler


I have developed application with rails 3.0.7 on heroku that target multiple user with high volume of uploading file (size aprox 400kb).

My question is, does when one user submit a file, are the instance that handle the request got bounded to that request so other request will have to wait for it to complete ?

Also, does handling this kind of request are better in a delayed job to improve performance and scalability ?

I really appreciate your help


Ahmy Yulrizka