Creating a .Net application with the OData metadata from your D365 application can generate a large file
A typical metadata file (edmx) retrieved from https://<d365url>/data/$metadata will return a file of almost 17MB. Turn that into a c# file using the T4 templates and the C# source file is almost 64MB.
After spending some time trying to reduce the EDMX file to only the entities I require (and a lot of nagging by my friend) I created a way to remove the excess entities from here. Result is a smaller EDMX file, and a more lightweight .Net application for you.
Reference this Trimmed EDMX file in your T4 template
The project and instructions can be found at my Github project EDMXTrimmer: https://github.com/shashisadasivan/EDMXTrimmer