Do you want to make a RTS game in unity but not sure how to move all the units efficiently? Don;t worry the  RTS Flowfield Movement System is available on the unity asset store. This asset uses dynamically spawning flowfields to direct units across the map. Many modern RTS, like Supreme Commander, use flowfields for troop movement. Get your copy here:
https://assetstore.unity.com/packages/tools/ai/rts-flow-field-movement-system-14...