Factorio-like conveyor belts benchmark

belts-items.benchmark

 100x100 belts, 100x10 items,  move_system only:
                243 ns/iter (+/- 18)            empty system
         43,542,818 ns/iter (+/- 3,215,204)     foreach belts { foreach items {
         10,884,685 ns/iter (+/- 2,657,142)     foreach items { belts.par_join().for_each() {
             42,826 ns/iter (+/- 5,720)         foreach belt { foreach item in belt.items {
             83,712 ns/iter (+/- 12,581)        per belt items list, parallel mutex
            132,643 ns/iter (+/- 30,206)        lazy update, add component to items with the computed velocity/position