Since Dynamics CRM 2013 we’ve been able to create our own APIs within the XRM framework using the Custom Action process type. Recently a new option appeared in the maker portal called Custom APIs which sounded very similar, so I thought I’d take a look.
FetchXML Late Materialize
The latest addition to FetchXML is Late Materialize. Turning this on or off doesn’t change the results of your query, but it does change how it’s executed behind the scenes, which could lead to some performance improvements.