Where are the libraries loaded and where does the execution take place?

[chengtie]

Hello,

I think playgrounds such as jsbin, jsfiddle execute the code in the browser. However, I am wondering if it is the case for requirebin.

After users write code in the textarea and launch run, does the execution takes place in the server of requirebin or in users' browser? And the libraries are loaded in the server of requirebin or in users' side?

I want to know this, because if this takes place in the server, when there are many users who use requrebin at the same time, is it supposed to be slow?

Thanks

Tie