Java or .NET DMS Integration

I am currently integarting SAP DMS with Microsoft .NET using the SAP .NET Connector with Bapi_Document_Checkoutviewx to download files from SAP DMS for use in external systems. This works, but it's slow and unreliable (sometimes the download locks up).

Our system is using HTTP content servers, and the document data is stored in MaxDB databases.

I was wondering what the options were for programmatically downloading files from SAP, in either .NET or Java?

Thanks!