First enter the number of particles in simulator. Then to change gravity use arrow keys. S to show variables, H to hide them. C to change how gravity is interacted ,2 modes At first there would be zero gravity Use *arrow keys* to interact gravity By pressing C you could change mode First Mode :Keep the value of gravity even when you are not pressing arrow keys Second Mode: Set values to 0 as soon as you stop pressing arrow keys
Must run in TURBO MODE (shift + start/green flag) It loads every particle one by one, particles loaded in second shows total times of loads in current second. If you wanna see your CPU cry ,load 300 particles. Higher the FPS, more accurate it would be. In my laptop I got https://www.desmos.com/calculator/mwejzdlvc8 FPS.