I wrote the post sp_execute_external_script and SQL Compute Context - I about how the SQL Server Compute Context (SQLCC) works with sp_execute_external_script (SPEES), as I wanted to correct some mistakes I did in the Microsoft SQL Server R Services - sp_execute_external_script - III post. I initially thought one post would be enough, but quite soon I realised I was too optimistic, and at least one more post would be needed, if not more. So this is the first followup post about SPEES and SQLCC.
To see other posts (including this) in the series, go to sp_execute_external_script and SQL Server Compute Context.
One of the reasons for me realising that one post is not enough is that while I wrote and executed code for the first post, I noticed some fairly significant performance differences using SQLCC compared to not using SQLCC (SQLCC performed better :)). So that is part of what we look at in this post.