Indeed it is.
A refinement: 1480 is no longer the optimum number (since emonLib had been tweaked to speed up sampling). The sampling rates, measured with a standard emonTx V3.4 (and the emonPi is the same processor) are:
calcIrms( ) - approx 5588 current samples per second.
calcVI( ) - approx 2535 pairs of voltage & current samples per second.
and the details:
Sampling rate of emonLib
(BTW - There’s no need for the heading-size text.)