S3 and Node.js/ Knox VS AWS.S3 sdk

We build a server in node.js which get/put/delete and search files in Amazon S3.

We think about 2 clients: The one is knox and the other is AWS-SDK for node.js.

When we use the last one (AWS-SDK for node.js), we encounter some problems of uploading and downloading files. We see that if we get more than 100 requests per min, some requests are freezes, and no response is got from Amazon S3.

For that, we consider to use knox. We are looking for any recommendation or known issues which related to knox or AWS-SDK for node.js