CPU cost of RCF computation. We show the CPU cost as a function of pixel resolution N_side, with different redshift resolutions z_Δ for clustering (top) or for clustering and shear (bottom). The redshift resolution is, from top down, z_Δ=0.0005 (blue), z_Δ=0.001 (yellow), z_Δ=0.0025 (green), and z_Δ=0.005 (red). The dashed lines connect points where N_side and z_Δ correspond to the same spatial resolution (from left to right, 6 Mpc, 3 Mpc, 1.5 Mpc). The input data is the full (circles) or the small (triangles) MICE simulation in z = 1.0–1.2. To guide the eye, one node-hour and one node-minute have been indicated by horizontal lines.