You also mentioned sweep speed at 1 kHz RBW. While we should have 1 THz/sec at 30 kHz RBW, once you cross into the 40 MHz patches, this slows down. You could expect about a 2-4 ms acquisition time per patch for a 1 kHz RBW. Assuming your CPU was decent, this would give you 40 MHz / 4 ms, or about 10 GHz/sec (maybe ~2 seconds for a 20 GHz sweep)