Having more than a handful of npcs render the server unplayable

Situation: Only one or two player on the server and speaking about server (not client) fps:

Having 40 roamingnpcs spawned at random roadpoints (4 groups with 10 bots) nearly all are just walking around, some doing harvesting, the server fps drop from 80-90 down to 10-20. Unplayable laggy and unresponsive.

Having 20 roamingnpcs spawned at random roadpoints (4 groups with 5 bots) nearly all are just walking around, some doing harvesting, the server fps drop from 80-90 down to 30-40. Drop not acceptable for having some fun npcs doing nearly nothing.

My personal opinion: The software RoamingNPCs is a nice prove of concept, when used with the example configuration. However, considering the other errors found and the fatally poor performance, it is not usable in production. If possible, I like to have my money back and will no longer play tester for alpha stage software.