Mongorestore uses huge amount of RAM

Problem Description

When restoring a backup made with mongodump with an all in all size of ~50GB, mongorestore is going to use up to 76GB of system memory. If run on a system with less memory, the system freezes.

Steps to Reproduce

1. Have a mongo database with one collection with a size > 40GB
2. Make a dump with mongodump (e.g. mongodump --host 127.0.0.1:27017 --db MyDB --authenticationDatabase admin -u MyUser -p MyPassword-o F:\
3. Do a restore (e.g. mongorestore.exe -host 127.0.0.1:27017 --db MyDB-drop --numInsertionWorkersPerCollection=10 --authenticationDatabase admin -u MyUser-p MyPassword F:\MyDB

Expected Results

Restore succeedes if started from any moderate performant device.

Actual Results

Restore is possible from a Cloud VM with 80GB of RAM. If run on a system with less memory, the system freezes.

Additional Notes

MongoDB Version

"_id" : "authSchema",
"currentVersion" : 5
}