just played with Esetnhel engine 1.0 again, and made a stupid RTS group movement code featuring line formation and group orientation due to path direction (only 500 lines is the whole together with rendering and debug info drawing stuff) using the built in navmesh pathfinder and physx (fine with 125 soldiers but becomes slow when 250 ones are onscreen).
( I could do the same in 3DGS easily (using my own area system instead of navmesh), probably by much more work (but having maybe more options for performance optimization). )