** Network operator Megaport Ltd (MP1.AX) slumps as much as 15.1% to A$15.52, its biggest intraday drop since October 2020 ** MP1 records monthly recurring revenue (MRR) of A$9.2 mln ($6.61 mln) in December qtr, up A$605,000 from previous qtr - slowest quarterly growth since March qtr ** Underlying growth in MRR in December qtr also slowest since September 2020 qtr ** Citi says key positive from co"s Q2 update was the record 123 net new customer additions for a December quarter which bodes well for the future as customers typically take up services over time ** However, port and Megaport Virtual Edge (MVE) additions was weaker than expected which could result in downgrades in 2H22 - Citi ** Brokerage says key for 2022 is for in-direct channel to ramp-up, especially for MVE which represents a source of upside over medium-term. ** MP1 hits lowest since June 8, 2021; down 1.6% this year, as of last close ($1 = 1.3914 Australian dollars)