This section on performance is best performed with a large database of cars and owners.
There is a load_data part of the app which will generate this database but it will take a long time (30 minutes or something like this).
To make things faster, I have included a DB which can be imported in REPO/data/dealership_db_250k.zip
To use this database, you simple need to unzip and then restore it with the following command:
In the terminal / command line change into the extracted folder containing the *.bson and *.json, then type:
mongorestore --drop --db dealership ./
On Windows, use .\ rather than ./
Now you should have a dealership db in MongoDB. Be sure to check the indexes. You may need to drop them (other than _id indexes).