Please fix the code below to make it faster

def countInBox(particleData, steps, lx, ly, ux, uy): for _ in range(steps): for i in range(len(particleData)): nx, ny= particleData[i][2]/particleData[i][3], particleData[i][4]/particleData[i][5] x, y = particleData[i][0], particleData[i][1] particleData[i][0] = nx * x - ny * y particleData[i][1] = ny * x + nx * y return sum([1 for i in range(len(particleData)) if(lx < particleData[i][0] < ux and ly < particleData[i][1] < uy)])