BUG RB133 + Mikrotik 5.4

Hello

When i’ve upgrade my RB133 to mikrotik 5.4 cpu usage has been about 40-60%, when i downgrade to 4.17 cpu has been on 10% usage max. I’ve attached a graph from cacti.
Traffic between interfaces is less than 1Mbps, no PPPOE, only EoIP tunnel.

look at /tool profile what exactly is using CPU.

It’s really strange, when i upgrade to 5.4 cpu increase again to 50-70% level, but when i log on it cpu keeps load about high level, but in a moment slow down to 10% max.
When i try to catch the load i get that:

NAME                    USAGE
wireless                 6.5%
snmp                       9%
console                  3.5%
flash                      2%
eoip                       0%
firewall                 0.5%
winbox                     0%
logging                  0.5%
management              41.5%
telnet                   0.5%
idle                    22.5%
profiling                9.5%
queuing                    2%
bridging                 0.5%
unclassified             1.5%

Graph from cacti.

Now i try to update to 5.5

After upgrade is little bit better, but is still high