I have the same problem on Hap AC 6.48.1 /tool profile NAME CPU USAGE l2tp 0% ethernet 1.5% console 0.5% dns 0% firewall 8.5% networking 6% ipsec 0% winbox 0% logging 0% management 33% encrypting 0% routing 0.5% bridging 1% unclassified 3% total 54%

The same problem HAP AC, 6.48.1 Disabling SNMP didn't help, Dude not use, Radius not in use. Disabling KID in KID CONTROL - solve problem. NAME CPU USAGE l2tp 0% snmp 0% spi 0% ethernet 3% console 0.5% ssh 0% dns 0.5% firewall 7.5% networking 10% winbox 0.5% logging 0.5% management 27.5% encrypting ...