At the #RTCEUR “All you ever wanted to ask about the Revit API” panel, Sasha Crotty strongly recommended submitting your suggestions for making the API better to the Revit Ideas board. This is a place where other people can vote for requests and Autodesk managers and developers are paying attention to the most popular items.
Even if you have already made requests on Autodesk’s Revit API Forum, if you really want the change/fix to be made Autodesk would like to submit an “idea” too.
Boost Your BIM 
Enable calls to the to the Revit native purging function methods or classes, to decrease the time it takes to purge unused elements programmatically using the Revit API.