Python Powered PowerPivot

In my previous post I described a method of exposing PowerPivot (or indeed any Excel model) as a simple Web Service. As it goes, it's elegant enough, but the requirement to have two processes to handle the web service (Excel itself and a JSDB.exe sub process) adds a degree of fragility, So, for example, not "playing" with the serving Excel process (as it will likely lock the service) or having to clean up the sub process window after shut down. It can also be slow, especially noticeable for quick requests (such as a AJAX validating request), as the process flows consists of: