How to bulk create 10000 users and groups for your test environment

For test lab scenarios where you quickly want to add a few thousand users you can run the following batch files in a DC:

:Creates 10000 disabled user accounts with password Password1
For /l %%t IN (1,1,10000) do net user BulkUser%%t Password1 /add /PASSWORDREQ:YES /ACTIVE:NO

:Bulk create 1000 groups
For /l %%t IN (1,1,1000) do net group Bulkgroup%%t /add /domain