Update v20200526:

Number of particle systems: spawning (explosions, trails, smokes, debris from buildings)
Number of particles in each running system (explosions, trails, smokes behind units etc.)
Explosion colouring the environment
Explosion deforming the terrain
Whether infantry ragdolls are enabled on death
How long do ragdolls last after death
How long do machine gun bullets travel
Limit accuracy of colliders around infantry bodies when viewed from a long distance
Reduce the number of sounds played and processed
Disable fly-by sounds
Spawning fewer trees on maps
Control the limit of units on lower settings.
Reset Button Added after game is over - to make it easier to restart in Sandbox.